Download or read book Steam Regeneration of Amine Impregnated Silica Based Sorbents for Post Combustion CO2 Capture written by Navjot Kaur Sandhu and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, an experimental investigation of CO2 capture using amine functionalized mesoporous silica based sorbents was carried out. Polyethyleneimine (PEI) impregnated silica sorbents were synthesized and tested in TGA under different adsorption temperatures and partial pressures of CO2. Sorbent characterization was carried out using N2 adsorption-desorption isotherms, FTIR, SEM and elemental analysis. Multiple cycles study was conducted to examine the effect of presence of O2 (0-5%) in flue gas on CO2 adsorption performance of sorbent. A separate packed bed study was conducted to study the effect of different concentrations of moisture (5.27-14.74%) in flue gas on CO2 adsorption and energy requirements for sorbent regeneration. A major study that was undertaken was to test the performance and stability of sorbent under steam stripping conditions. Steam was used for sorbent regeneration in a multiple cycle study and characterization of used sample was carried out to study any change in sorbent properties. Steam at different temperatures was used to study CO2 desorption. Desorption kinetics for steam and inert gas stripping was compared. It was observed that the sorbent performance was stable under steam environment along with improved desorption kinetics over inert gas stripping. No steam condensation or amine leaching was observed in this study.

Download or read book Study of Amine Impregnated on Silica Support for CO2 Capture written by Jak Tanthana and published by . This book was released on 2008 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid increase in CO2 emission in recent years has become a major concern because of its potential link to global climate change. Among CO2 contributors, coal-fire power plant accounts for more than 30% of total CO2 emission worldwide. Three major approaches for capture of CO2 are proposed: postcombustion, oxyfuel and precombustion. Each has distinct advantages and disadvantages. Postcombustion utilizing amine based absorption process by far is the most fundamentally established and can be retrofitted to existing coal-fire power plants around the globe. Limited by high heat of reaction, the amine absorption process requires a significant amount of energy during solvent regeneration. Large physical facility foot print and corrosive problems are among the important issues which need to be addressed. Utilizing sorbent impregnated with amine specie shows competitive CO2 capture ability and may lead to a more practical solution from its lower operating temperature in the regeneration step, smaller foot print and less corrosion. Many solid sorbent products available commercially can be tailored to meet certain specifications such as controlled pore size distribution, high porosity or govern specific reactions at relatively low cost. Silica fume was chosen in this study due to its high availability, high surface area and flexibility to modify surface properties using various methods of treatments. In this study, silica support sorbent was impregnated with tetraethylenepentamine by various wt% concentrations applying an ex-situ impregnation method. Acid and Base treatment of amine impregnated samples were employed in the study. The sorbents were then characterized as to their performance of CO2 absorption-desorption. The capturing performance and effect from acid/ base were evaluated. Results of this study concluded that ex-situ impregnation can be used to successfully prepared tetraethylenepentamine impregnated SiO2. The sorbents exhibited ability to perform CO2 absorption-desorption exceeding primary target capture performance set by Department of Energy (DoE) under optimized concentration of tetraethylenepentamine. Intensity of IR absorbance may correlate with the concentration of amine functional groups on surface of SiO2. Weakly and strongly bonded CO2 with tetraethylenepentamine were suggested. Hypothesized form of absorbed species of monodentate bicarbonate and bidentate bicarbonate were detected in the study. Acid treatment causes performance degradation which was evident from the degradation of the amine functional groups on the silica surfaces while base treatment did not improve nor degrade the sorbent performance. Hence, CO2 absorption-desorption mechanism is not altered by the base treatment.

Download or read book Post combustion Carbon Dioxide Capture Materials written by Qiang Wang and published by Royal Society of Chemistry. This book was released on 2018-10-22 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inorganic solid adsorbents/sorbents are attractive materials for capturing carbon dioxide (CO2) from flue gases after fossil fuel combustion. Post-combustion Carbon Dioxide Capture Materials introduces the key inorganic materials used as adsorbents/sorbents with specific emphasis on their design, synthesis, characterization, performance, and mechanism. Dedicated chapters cover carbon-based adsorbents, zeolite- and silica-based adsorbents, metal–organic framework (MOF)-based adsorbents, and alkali-metal-carbonate-based adsorbents. The final chapter discusses the practical application aspects of these adsorbents used in carbon dioxide capture from flue gases. Edited and written by world-renowned scientists in each class of the specific material, this book will provide a comprehensive introduction for advanced undergraduates, postgraduates and researchers from both academic and industrial fields wishing to learn about the topic.

Download or read book Temperature Swing Adsorption Using Amine Impregnated Adsorbent for CO2 Capture written by Sahil Bangar and published by . This book was released on 2015 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capture of carbon dioxide from flue gas using amine functionalized silica based adsorbents has shown great potential recently. Despite their stable performance, the full potential of these adsorbents has not been researched in greater depth. In this thesis, experimental study and simulation of a temperature swing adsorption process for capture of CO2 and regeneration of the adsorbent using steam were carried out. Special emphasis was given on maximizing the purity of CO2 captured using this process, so as to lower the cost of further compression required for sequestration. For simulation of the cyclic temperature swing adsorption process, experimental measurements were carried out to study the adsorbent, suitable process modeling software was chosen and cycle configurations to maximize the performance of adsorbent were developed. Experimental isotherm data was collected for the amine impregnated adsorbent and an isotherm model was fitted. Subsequently, the isotherm parameters from the fitted model were used as input data for modeling of cyclic TSA processes. A reliable adsorption process simulator was then chosen based on its ability to accurately predict the column dynamics for an adsorption process. Model equations for the one-dimensional rigorous model comprising of mass, momentum and heat balances used for the simulation of the adsorption process are detailed. The effective model predictions of the simulator were validated using an adsorption process described in the literature, since the results were discerned to be in the acceptable range, further simulations using the software were carried out. A basic 3-step TSA cycle was developed to capture CO2 using amine impregnated silica adsorbent. Since the purity of the CO2 recovered using this configuration was not very high, another 4-step cycle with steam purge was implemented. The introduction of the steam purge step improved the purity considerably while lowering the recovery marginally. Parametric studies for both the cycles were also performed to determine the best operating conditions for the process.

Download or read book Advanced CO2 Capture Technologies written by Shin-ichi Nakao and published by Springer. This book was released on 2019-05-07 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the advanced CO2 capture technologies that can be used to reduce greenhouse gas emissions, especially those from large-scale sources, such as power-generation and steel-making plants. Focusing on the fundamental chemistry and chemical processes, as well as advanced technologies, including absorption and adsorption, it also discusses other aspects of the major CO2 capture methods: membrane separation; the basic chemistry and process for CO2 capture; the development of materials and processes; and practical applications, based on the authors’ R&D experience. This book serves as a valuable reference resource for researchers, teachers and students interested in CO2 problems, providing essential information on how to capture CO2 from various types of gases efficiently. It is also of interest to practitioners and academics, as it discusses the performance of the latest technologies applied in large-scale emission sources.

Download or read book Handbook of Climate Change Mitigation written by Wei-Yin Chen and published by Springer. This book was released on 2012-02-13 with total page 2130 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a mounting consensus that human behavior is changing the global climate and its consequence could be catastrophic. Reducing the 24 billion metric tons of carbon dioxide emissions from stationary and mobile sources is a gigantic task involving both technological challenges and monumental financial and societal costs. The pursuit of sustainable energy resources, environment, and economy has become a complex issue of global scale that affects the daily life of every citizen of the world. The present mitigation activities range from energy conservation, carbon-neutral energy conversions, carbon advanced combustion process that produce no greenhouse gases and that enable carbon capture and sequestion, to other advanced technologies. From its causes and impacts to its solutions, the issues surrounding climate change involve multidisciplinary science and technology. This handbook will provide a single source of this information. The book will be divided into the following sections: Scientific Evidence of Climate Change and Societal Issues, Impacts of Climate Change, Energy Conservation, Alternative Energies, Advanced Combustion, Advanced Technologies, and Education and Outreach.

Download or read book Environmental Applications of Nanomaterials written by Glen E. Fryxell and published by World Scientific. This book was released on 2012 with total page 751 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is concerned with functional nanomaterials, materials containing specific, predictable nanostructures whose chemical composition, or interfacial structure enables them to perform a specific job: to destroy, sequester, or detect some material that constitutes an environmental threat. Nanomaterials have a number of features that make them ideally suited for this job: they have a high surface area, high reactivity, easy dispersability, and rapid diffusion,to name a few. The purpose of this book is to showcase how these features can be tailored to address some of the environmental remediation and sensing/detection problems faced by mankind today. A number of leading researchers have contributed to this volume, painting a picture of diverse synthetic strategies, structures, materials, and methods. The intent of this book is to showcase the current state of environmental nanomaterials in such a way as to be useful either as a research resource, or as a graduate level textbook. We have organized this book into sections on nanoparticle-based remediation strategies, nanostructured inorganic materials (e.g. layered materials like the apatites), nanostructured organic/inorganic hybrid materials, and the use of nanomaterials to enhance the performance of sensors.

Download or read book Study of Aminosilica Adsorbents for CO2 Capture written by Seyed Mehdi Kamali Shahri and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The global demand for energy has increased continuously since the industrial revolution.Fossil fuels such as coal, natural gas, and oil are the primary sources that satisfy this demand. Asa result, the irrefutable influence of anthropogenic CO2 released into the environment hasconsiderably intensified global warming. Coal- and gas-fired power plants are considered one ofthe major source points of fossil fuel consumption. Although renewable energy (i.e., solar, wind,and others) is considered as the ideal alternative to satisfy the future energy demand, in theinterim an actual solution is essential to remove the CO2 produced before its emission into theatmosphere. Among various capturing processes, post-combustion capture is highly promisingdue to the flexibility of CO2 removal via liquid or solid materials. The captured CO2 is thensequestered or converted into new chemical compounds. The capturing process is the mostimportant and energy-intensive step. A major advantage of liquid phase adsorbents is their highcapacity; however, they suffer significantly from a high energy penalty. Solid phase adsorption,which has a lower energy requirement for regeneration, has therefore attracted much attention. Inthe operating conditions of power plants, amine-impregnated support (Type I) sorbents are themost promising among various solid sorbents, due to the high density of nitrogen-active sites, butsuffer from low capacity and efficiency compared to liquid phase absorption process. In order toapproach the problem and understand the origin of this low efficiency, a scientific understandingof the interaction between CO2 and amine-impregnated supports and the influential parametersinvolved is necessary to further develop new and high-efficiency amine-based adsorbents.Novel experimental techniques have been utilized in this research to assess the kineticsand thermodynamics of CO2 adsorption. The influence of structure (linear vs. branch), aminedensity, amine type (primary, secondary, and tertiary), support surface functionalization, andoperating conditions on the thermodynamics and kinetics of CO2 adsorption have been studied. Aivcombination of volumetric adsorption (VA) and differential scanning calorimetry (DSC) havebeen used to study the equilibrium capacity and thermodynamic parameters. The kinetic study hasbeen conducted through a breakthrough reactor (BTR) coupled with a DSC to evaluate CO2adsorption kinetics.At the equilibrium, linear amines, compared to branched amines, indicate a larger CO2adsorption capacity and lower apparent heat of adsorption. For example, the capacity and heat ofadsorption for 40 wt% linear and branch polyethylenimine (PEI) measured to be 3.68 and 2.36mmolCO2/g, along with 68 and 71 kJ/molCO2 at 60oC and 1 bar CO2, respectively. The apparentheat of CO2 adsorption on amine sorbents consists of the intrinsic heat of adsorption, the energyrequirement for diffusion, and amine reorganization, which then approached the intrinsic heat ofadsorption when the necessary energy was provided for CO2 diffusion and amine conformation.Augmenting the amine weight loading also increased the capacity and heat of adsorption. Forinstance, TETA/SiO2 samples showed adsorption capacity enhancements from 0.34 to 1.87mmolCO2/g and heat of adsorption from 45 to 77 kJ/molCO2 as the weight loading increasedfrom 5 to 40 wt% at 60oC and 1 bar CO2. Increasing the secondary amine in the linear structurealso assisted in enhancing capacity and decreasing heat of adsorption. For example, the CO2uptake for TETA and PEI423 increased from 1.87 to 3.68 mmolCO2/g and the heat of adsorptiondeclined from 77 to 68 kJ/molCO2 at 60oC and 1 bar CO2. Polyethylenimine therefore presenteda better performance than molecular amines, which makes PEI more suitable for industrialapplications. The criteria defined by the National Energy and Technology (NETL) for industrialutilization requires 3-6 mmolCO2/g adsorbent capacity to compete with current for carbon captureand sequestration (CCS) technologies. As yet, the criteria have been met; nevertheless, theadsorption efficiency displayed much lower values compared to the theoretical expectationsbased on the proposed mechanism. For example, in theory, the efficiency for dry conditions isexpected to be 0.5, while reports in the literature revealed values of less than 0.3 in experiments.vEfficiency increases directly enhance on total capacity. Moreover, a decrease in heat ofadsorption also provides a more appealing situation for real application in view of the fact that theenergy penalty for regeneration is reduced.The kinetic investigation on the BTR/DSC combination showed similar results in termsof capacity, heat of adsorption, temperature variation, and secondary amine addition. High amine-OH interaction and low CO2 diffusivity into multilayer amines were found as the major issues forthe reduction in amine capacity and efficiency. For instance, the efficiencies for 10 wt% TETAimpregnated on silica and silica-modified surfaces (with octyl groups) at 60oC increasedsignificantly from 0.16 to 0.35, respectively, indicative of reduced amine-OH interaction. Inaddition, efficiency was enhanced from 0.17 to 0.26 for 40 wt% TETA/SiO2 as the temperatureascended from 25oC to 80oC, revealing the effect of facilitated diffusion. Increasing the numberof secondary amines decreased the optimum heat of adsorption for the highest overall rates andalso increased the overall rates. For example, as the 2o/1o ratio increased from 1 to 2 for 40 wt%amine-impregnated silica at 40oC, the optimum heat of adsorption was reduced from 85 to 69kJ/molCO2 and the overall rates were enhanced from 0.013 to 0.015 mmolCO2/g.s. This indicatesthat an increase in the secondary amine ratio offers several benefits for CO2 adsorption. Surfacefunctionalization toward hydrophobicity could also assist to improve capacity, efficiency, andCO2 adsorption kinetics as exemplified above for efficiency. For example, the overall adsorptionrate for 10 wt% TETA/SiO2 at 25oC increased from 0.0075 to 0.0122 mmolCO2/g.s as thehydroxyl groups on the support were replaced with methyl groups. A rigorous spatiotemporalmodeling was applied to the BTR/DSC data to estimate the kinetics and thermodynamicparameters at isothermal conditions. This unique mathematical model predicted the adsorptionand desorption rate constant as well as the heat of adsorption. The model circumventedunphysical simplifications, such as linear driving force and uniform adsorption rates, byconsidering dispersion and convection phenomena.

Download or read book Post combustion Carbon Dioxide Capture Using Amine Functionalized Solid Sorbents written by Nikhil Mittal and published by . This book was released on 2013 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is divided into two parts: (1) Synthesis of amine functionalized adsorbents using grafting technique for post-combustion CO[subscript 2] capture, (2) Performance evaluation of structured bed configuration with straight gas flow channels using amine impregnated adsorbent for post-combustion CO[subscript 2] capture. Brief description of each part is given below: (1)N-(3-trimethoxysilylpropyl)diethylenetriamine (DAEAPTS) grafted SBA-15 adsorbents were synthesized for CO[subscript 2] capture. The adsorption of CO[subscript 2] on the amine-grafted sorbents was measured by thermogravimetric method over a CO[subscript 2] partial pressure range of 8-101.3 kPa and a temperature range of 25-105 °C under atmospheric pressure. The optimal amine loaded SBA-15 adsorbent was examined for multi-cycle stability and adsorption/desorption kinetics. (2)The performance of structured bed and packed bed configurations for post-combustion CO[subscript 2] capture was evaluated using PEI impregnated SBA-15 adsorbent. The effect of adsorption temperature (25-90 °C), adsorption /desorption kinetics and multi-cycle stability was studied in both structured and packed bed configurations.

Download or read book An Economy Based on Carbon Dioxide and Water written by Michele Aresta and published by Springer. This book was released on 2019-07-01 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to CO2 capture and utilization (CCU) from a green, biotechnological and economic perspective, and presents the potential of, and the bottlenecks and breakthroughs in converting a stable molecule such as CO2 into specialty chemicals and materials or energy-rich compounds. The use of renewable energy (solar, wind, geothermal, hydro) and non-fossil hydrogen is a must for converting large volumes of CO2 into energy products, and as such, the authors explore and compare the availability of hydrogen from water using these sources with that using oil or methane. Divided into 13 chapters, the book offers an analysis of the conditions under which CO2 utilization is possible, and discusses CO2 capture from concentrated sources and the atmosphere. It also analyzes the technological (non-chemical) uses of CO2, carbonation of basic minerals and industrial sludge, and the microbial-catalytic-electrochemical-photoelectrochemical-plasma conversion of CO2 into chemicals and energy products. Further, the book provides examples of advanced bioelectrochemical syntheses and RuBisCO engineering, as well as a techno-energetic and economic analysis of CCU. Written by leading international experts, this book offers a unique perspective on the potential of the various technologies discussed, and a vision for a sustainable future. Intended for graduates with a good understanding of chemistry, catalysis, biotechnology, electrochemistry and photochemistry, it particularly appeals to researchers (in academia and industry) and university teachers.

Download or read book Advances in Carbon Capture written by Mohammad Reza Rahimpour and published by Woodhead Publishing. This book was released on 2020-08-04 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Carbon Capture reviews major implementations of CO2 capture, including absorption, adsorption, permeation and biological techniques. For each approach, key benefits and drawbacks of separation methods and technologies, perspectives on CO2 reuse and conversion, and pathways for future CO2 capture research are explored in depth. The work presents a comprehensive comparison of capture technologies. In addition, the alternatives for CO2 separation from various feeds are investigated based on process economics, flexibility, industrial aspects, purification level and environmental viewpoints. - Explores key CO2 separation and compare technologies in terms of provable advantages and limitations - Analyzes all critical CO2 capture methods in tandem with related technologies - Introduces a panorama of various applications of CO2 capture

Download or read book Absorption Based Post Combustion Capture of Carbon Dioxide written by Paul Feron and published by Woodhead Publishing. This book was released on 2016-05-27 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Absorption-Based Post-Combustion Capture of Carbon Dioxide provides a comprehensive and authoritative review of the use of absorbents for post-combustion capture of carbon dioxide. As fossil fuel-based power generation technologies are likely to remain key in the future, at least in the short- and medium-term, carbon capture and storage will be a critical greenhouse gas reduction technique. Post-combustion capture involves the removal of carbon dioxide from flue gases after fuel combustion, meaning that carbon dioxide can then be compressed and cooled to form a safely transportable liquid that can be stored underground. - Provides researchers in academia and industry with an authoritative overview of the amine-based methods for carbon dioxide capture from flue gases and related processes - Editors and contributors are well known experts in the field - Presents the first book on this specific topic

Download or read book Development of Solid Amine Immobilized Silica Sorbent and Gram Scale Process for CO2 Capture written by Mathew Isenberg and published by . This book was released on 2010 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past 50 years the use of fossil fuels has lead to a 22% increase in the CO2 concentration levels in the atmosphere. It has also been recognized that the energy producing sector, coal-fired power plants in particular, contribute approximately 33% of the total global emissions. It is of immediate concern that a technology be developed that can be retrofit to the power plants in order to capture CO2 from the flue gas, eliminating a significant source of CO2 emissions. Current commercialized technologies such as liquid amine scrubbing using monoethanolamine (MEA) and chilled ammonia capturing processes have demonstrated successful capture of CO2 gas but involve using highly toxic and corrosive compounds with high heats of regeneration. Development of a solid immobilized amine sorbent that exhibits high CO2 capture and cyclical stability may prove to be a more sensible solution due to its low heat of regeneration, toxicity, and corrosive properties. In this study, fumed silica was chosen as the solid support because of its high commercial availability and high surface area. In this thesis, silica based sorbents were developed through impregnation of tetraethylenepentamine (TEPA) at various weight percent ratios and further modified with the addition of polyethylene glycol (PEG) to aid in dispersing TEPA and cyclical stability of the sorbent. Although the development of sorbents using the same compounds have been reported on in literature, there has been no work done using infrared (IR) characterization to determine the way the compounds interact with each other and with the surface. This thesis has been constructed in order to develop an understanding of these surface interactions and use it to fabricate the best possible sorbent. The IR results concluded that the co-impregnation of PEG and TEPA with corresponding TEPA/PEG/SiO2 weight ratios of 24/36/40 yielded the highest CO2 capture capacity (2.53 mmolCO2/gramSorbent) and best cyclical stability (3% degradation). A gram scale process was also developed for the adsorption and regeneration of CO2 gas from a feed stream of 15% CO2. The process was designed mirroring industrial conditions and resulted in good initial CO2 regeneration concentrations.

Download or read book Synthesis Characterisation and Optimisation of Novel Adsorbents for CO2 Capture written by Esgeboria Obhielo and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a suite of novel CO2 capture sorbents were prepared employing three facile synthetic routes: amine assimilation (co-synthesis), wet impregnation and in situ-impregnation synthesis, to develop a range of materials capable of efficiently adsorbing CO2 while demonstrating their applicability as alternative materials for CO2 capture from coal and gas fired power plants via post-combustion carbon capture. Prepared sorbents were characterised for individual physical and chemical properties, using, scanning electron microscopy, infrared spectroscopy, thermogravimetric analysis, elemental analyses and N2 sorption at 77 K. CO2capture capacities were determined using gravimetric analysis under a range of analysis conditions (different temperature and pressure), with the corresponding effects of materials characteristics on CO2 capacities investigated. The effect of amine incorporation was explored in detail, with findings first bench-marked against the corresponding amine free counterparts, and, then, the effect of increasing amine content analysed. So far, within the context of this study, results suggest that materials prepared via the synthetic routes adopted, exhibit high degrees of synthetic control; in addition, CO2 capture capacities were determined to be dependent upon both textural properties but, more importantly, the basic nitrogen functionalities contained within these materials. This observation was prominent with amine in-situ impregnated silica and melamine resorcinol formaldehyde samples, but not wholly for bio-inspired amine silica samples, as the degree of amine functionalisation could not be controlled by the synthetic route chosen. Irrespective, all materials have shown enhanced adsorption performance as a result of the incorporation of basic nitrogen functionalities into the sorbent structures. Furthermore, prepared materials exhibited easy regeneration and maintained stable sorption capacities ≤ 99.9% over the cycles analysed, with results obtained suggesting new strategies for carbon capture materials development for efficient CO2 capture from power plant flue gas and other relevant applications.

Download or read book Comprehensive Study of the Impact of Steam on Polyethyleneimine on Silica for CO2 Capture written by and published by . This book was released on 2013 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: An amine sorbent, prepared by impregnation of polyethyleneimine on silica, was tested for steam stability. The stability of the sorbent was investigated in a fixed bed reactor using multiple steam cycles of 90 vol % H2O/He at 105 °C, and the gas effluent was monitored with a mass spectrometer. CO2 uptake of sorbent was found to decrease with repeated exposure to steam. Characterization of the spent sorbent using N2 physisorption, SEM, and thermogravimetric analysis (TGA) showed that the decrease in CO2 loading can possibly be attributed to a reagglomeration of the amine in the pores of the silica. No support effect was found in this study. The commercial SiO2 used, Cariact G10, was found to be stable under the conditions used. While it was found that subjecting the sorbent to several steam cycles decreased its CO2 uptake, a continuous exposure of the sorbent to steam did not have a significant performance impact. Finally, a silanated sorbent, consisting of a mixture of PEI and aminopropyl-triethoxysilane on SiO2 support, was also investigated for steam stability. Similarly to the nonsilanated sorbent, the CO2 loading of this sorbent decreased upon steam exposure, although a mechanism for this change has not been postulated at this time.

Download or read book Synthesis and Carbon Dioxide Adsorption Properties of Amine Modified Particulate Silica Aerogel Sorbents written by Nick Linneen and published by . This book was released on 2014 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Post-combustion carbon capture is a viable option for reducing CO2 greenhouse gas emissions, and one potentially promising technology for this route is adsorption using chemically and physically based sorbents. A number of exceptional CO2 sorbents materials have been prepared including metal organic frameworks, zeolites, and carbon based materials. One particular group of capable materials are amine based solid sorbents that has shown to possess high adsorption capacities and favorable adsorption kinetics. A key variable in the synthesis of an amine based sorbent is the support which acts as the platform for the amine modification. Aerogels, due to their high porosities and surface areas, appear to be a promising support for an amine modified CO2 sorbent. Therefore, in order to develop a commercially viable CO2 sorbent, particulate aerogels manufactured by Cabot Corporation through an economical and proprietary ambient drying process were modified with amines using a variety of functionalization methods. Two methods of physical impregnation of the amino polymer TEPA were performed in order to observe the performance as well as understand the effects of how the TEPA distribution is affected by the method of introduction. Both samples showed excellent adsorption capacities but poor cyclic stability for lack of any covalent attachment. Furthermore the method of TEPA impregnation seems to be independent on how the polymer will be distributed in the pore space of aerogel. The last two methods utilized involved covalently attaching amino silanes to the surface silanols of the aerogel. One method was performed in the liquid phase under anhydrous and hydrous conditions. The materials developed through the hydrous method have much greater adsorption capacities relative to the anhydrous sample as a result of the greater amine content present in the hydrous sample. Water is another source of silylation where additional silanes can attach and polymerize. These samples also possessed stable cyclic stability after 100 adsorption/regeneration cycles. The other method of grafting was performed in the gas phase through ALD. These samples possessed exceptionally high amine efficiencies and levels of N content without damaging the microstructure of the aerogel in contrast to the liquid phase grafted sorbents.

Download or read book Materials for Carbon Capture written by De-en Jiang and published by John Wiley & Sons. This book was released on 2020-02-25 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers a wide range of advanced materials and technologies for CO2 capture As a frontier research area, carbon capture has been a major driving force behind many materials technologies. This book highlights the current state-of-the-art in materials for carbon capture, providing a comprehensive understanding of separations ranging from solid sorbents to liquid sorbents and membranes. Filled with diverse and unconventional topics throughout, it seeks to inspire students, as well as experts, to go beyond the novel materials highlighted and develop new materials with enhanced separations properties. Edited by leading authorities in the field, Materials for Carbon Capture offers in-depth chapters covering: CO2 Capture and Separation of Metal-Organic Frameworks; Porous Carbon Materials: Designed Synthesis and CO2 Capture; Porous Aromatic Frameworks for Carbon Dioxide Capture; and Virtual Screening of Materials for Carbon Capture. Other chapters look at Ultrathin Membranes for Gas Separation; Polymeric Membranes; Carbon Membranes for CO2 Separation; and Composite Materials for Carbon Captures. The book finishes with sections on Poly(amidoamine) Dendrimers for Carbon Capture and Ionic Liquids for Chemisorption of CO2 and Ionic Liquid-Based Membranes. A comprehensive overview and survey of the present status of materials and technologies for carbon capture Covers materials synthesis, gas separations, membrane fabrication, and CO2 removal to highlight recent progress in the materials and chemistry aspects of carbon capture Allows the reader to better understand the challenges and opportunities in carbon capture Edited by leading experts working on materials and membranes for carbon separation and capture Materials for Carbon Capture is an excellent book for advanced students of chemistry, materials science, chemical and energy engineering, and early career scientists who are interested in carbon capture. It will also be of great benefit to researchers in academia, national labs, research institutes, and industry working in the field of gas separations and carbon capture.