Download or read book Analysis of the Adsorption Behaviour of Binary CO2 and CH4 Gas Mixtures in N2 Using Activated Carbon at Different Operating Conditions written by Abdelrahman Ahmed Elsayed Elbasousy and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of Adsorption Isotherms and Breakthrough Curves for a Gas Mixture of Co2 and CH4 with N2 Using Activated Carbon written by Gurashi Dawelnaeim Hamad Mohamed and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adsorption and Separation of Carbon Dioxide for Biomethane Production written by Joselin Deneb Peredo Mancilla and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomethane is a proven source of clean energy, it is one of the most cost-effective and environment-friendly substitute for natural gas and diesel. The European Union primary energy production from biomethane has folded by ~23 times in a 5 years time period (2011-2016) making necessary to find new and improved solutions for the separation of methane (CH4) and carbon dioxide (CO2), main components of biogas. In this context, the objective of this doctoral thesis is the determination of performance indicators such as the adsorption capacity and selectivity of activated carbons (ACs) for the CH4/ CO2 separation. This work focuses on the adsorption properties of activated carbons for the methane/carbon dioxide separation. To this end, CH4 and CO2 pure gas experimental adsorption isotherms of activated carbons were obtained on a pressure range of 0.1 to 3 MPa) and temperatures ranging from 303 to 323 K. The first part of this thesis project consisted in the analysis of the CH4 and CO2 pure gas adsorption properties of 5 commercial activated carbons Using a set of five commercial activated carbons a linear relationship between the adsorbent surface area and the CO2 adsorption capacity was determined. The micropore volume also showed a direct influence on the adsorption capacity. The second part of this work consisted in the study of the carbon dioxide and methane adsorption behavior of biomass-based activated carbons. Using a series of 3 ACs that had been obtained from olive stones by different activation methods, the activation technique proved to be of mayor importance as it determines the textural and chemical properties of the adsorbent and thus its gas adsorption capacity.Lastly, the CH4/CO2 adsorption selectivity of the 5 commercial activated carbons was calculated from the equimolar mixture adsorption isotherms. The selectivity factor was proven to be dependent on the sum of textural and chemical properties of the samples. Although, activated carbons with high average pore sizes and surface areas depicted higher adsorbed quantities it was on detriment of their selectivity. The selectivity was found to be better for the activated carbon showing an intermediate surface area and a narrow pore size distribution. In addition, the presence of sulfur functionalities was also found to improve the adsorption selectivity. Overall, this work shows that activated carbons are competitive materials for the upgrading of biogas, displaying adsorption properties comparable to those of other commercially available materials.
Download or read book Theoretical Chemical Engineering Abstracts written by and published by . This book was released on 1986 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adsorption Heat Pumps written by Daniel B. Boman and published by Springer Nature. This book was released on 2021-05-21 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume introduces the fundamentals of adsorption heat pumps, beginning with the simplest cycle and building to the most complex. Selection of adsorbents and refrigerants, design of adsorption beds and auxiliary heat exchangers, and applications for different designs are all discussed. The book educates engineering students, engineers, and researchers about an environmentally friendly alternative to vapor compression refrigeration systems promising for many applications. The authors cover thermodynamic cycles, working materials for the cycles, and aspects of designing and modeling adsorption heat pumps. Elucidates the various applications of adsorption heat pumps; Illustrates modeling techniques for quickly screening new working materials early in their development; Provides comprehensive review of cycle types, with discussion of the applications for which they are best suited; Appropriate for graduate courses on advanced thermodynamics, design of thermal systems, sustainable energy technology, refrigeration technologies, and thermal control of electronics.
Download or read book Modeling the Adsorption of Methane Carbon Dioxide Nitrogen and Their Binary Mixtures on Activated Carbon Using the Simplified Local Density Model written by J. E. Fitzgerald and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chaos And Fractals In Chemical Engineering Proceedings Of The First National Conference written by Giuseppe Biardi and published by World Scientific. This book was released on 1995-01-16 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This conference focused on the current research and future perspectives on the application of disordered systems theory, fractals and chaotic dynamical systems to chemical engineering problems. The contributions published here are organised around 4 main themes: Chaos (Analysis and Control) in Reactors and Reacting Systems; Transport in Disordered Media; Time-Series Analysis; and Multiphase Flow Characterization.
Download or read book Porosity in Carbons written by John W. Patrick and published by John Wiley & Sons. This book was released on 1995-01-06 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porosity in carbons often means different things to different people depending largely on the different applications of the various carbon materials. On the one hand, users involved in gas purification or respiratory protection are concerned primarily with microporosity, and at the other extreme, the user of carbon in the form of metallurgical coke is concerned with macroporosity because of its influence on the mechanical properties of the coke. Between these extremes there is a range of applications which rely on different aspects of the nature of the porous structure and the characterization required reflects the particular application in mind. This characterization of a wide diversity of porous structures presents some problems. However recent developments have produced some solutions, for example computerized image analysis has facilitated the measurement of pore shape and size. The eleven chapters in this book present an analysis of the current methods of characterization and the role of various aspects of carbon porosity in some representative and diverse applications.
Download or read book Equilibrium and Mass Transfer Behaviour of CO2 Adsorption on Zeolites Carbon Molecular Sieve and Activated Carbons written by Md Ariful Islam Sarker and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pressure Swing Adsorption written by Douglas M. Ruthven and published by John Wiley & Sons. This book was released on 1996-12-17 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure Swing Adsorption is the first book that provides a coherent and concise summary of the underlying science and technology of pressure swing adsorption (PSA) processes at a level understandable to the practising engineer. PSA has achieved widespread commercial acceptance as the technology of choice for hydrogen purification, air separation and small scale air driers. However, PSA has numerous other actual and potential uses such as the recovery of methane from landfill gas, the production of carbon dioxide and other large scale applications. Since the design and optimization of a PSA process requires a somewhat mathematical model, two chapters of the book provide in-depth information on equilibrium theory and dynamic numerical simulation. However, this mathematical material will also help the general reader develop an understanding of the principles and strenghts and limitations of various approaches. PSA engineers, chemical engineers, environmental chemists, academicians and managers who must make informed decisions about purchasing costly PSA systems will find Pressure Swing Adsorption of particular value.
Download or read book Fundamental Investigation of Gas Adsorption in Micro and Mesoporous Carbons written by Yangyang Liu and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To mitigate CO2 emissions from direct combustions of fossil fuels into the atmosphere, alternate energy sources with zero carbon emissions offer ultimate solutions. However, technologies based on thermodynamically efficient and large-scale economic electricity generation from non-carbon-based energy sources are still in development. Therefore, carbon capture combined with utilization and sequestration could serve as a bridging strategy to a time when noncarbon energy technologies are broadly deployed. As one of the attractive options, CO2 captured by carbon-based sorbents as well as CO2 sequestration in unmineable coalbeds require a thorough understanding of CO2 adsorption properties in micro- and mesoporous carbon materials. A major obstacle is insufficient understanding of the molecular-scale processes involving CO2 sorption on organic matter with structural and/or chemical heterogeneities at pressures and temperatures of interest for both carbon capture and sequestration applications. Current fundamental investigations of gas sorption onto functionalized carbon surfaces involve the characterization of carbon-based samples by experimental methods, understanding of electronic properties of functionalized carbon surfaces by density functional theory (DFT), and the thermodynamic property predictions using a Monte Carlo (MC) method within the grand canonical ensemble. Complex pore structures not only for coals, but also for other carbon-based porous materials have frequently been modeled as a collection of independent, noninterconnected slit pores with perfect graphitic walls. However, the agreement between the MC and experimental adsorption experiments often involve structurally and chemically heterogeneous systems. With the chemistry of the organic matrix unknown in the current system it is crucial that the initial models for MC are as representative of the chemistry as possible. Within the complex heterogeneous structure of the organic matrices of coal and other carbon-based porous materials, there likely exists a combination of defect sites and dangling bonds. The presence of volatile components such as water vapor, methane, and nitrogen- and sulfur-containing compounds is also expected. Indeed, these defects and functional groups are expected to play a role in the adsorption mechanisms associated with CO2 on these systems depending on the local temperature and pressure. For instance, if the temperature and pressure conditions favor surface-bound water or various forms of dissociated water (e.g., hydroxyl or carbonyl groups at the carbon surface) at the surface this may lead to complex CO2-water-surface interactions. Rather than CO2 interacting directly with a surface, it may react indirectly via a shared proton. As the first step, carbon-based materials (e.g. coal, gas shale) have been characterized by different techniques incuding FTIR, SEM, NMR cryoporometry, and Quantachrome porometry, to understand the chemical composition, surface functionality, porosity, pore-size distribution (PSD), etc. As the second step, density functional theory (DFT) calculations including a van der Waals correction have been performed to investigate the electronic properties of the graphitic surfaces and the adsorbed phase of molecular CO2. With a Bader charge analysis, DFT investigations also assisted in setting up models for the initial framework required to carry out statistical modeling. Grand canonical Monte Carlo (GCMC) was employed in the next step to simulate the macroscopic adsorption thermodynamic properties. Di_erent potential models of the CO2 molecule were compared as well. The implementation of the GCMC method yielded the adsorption isotherms of CO2 on various functionalized carbon surfaces, as well as the selectivity for multi-component systems at various temperature/pressure conditions for both carbon capture and sequestration applications. The effects of various pore sizes, potential models, temperatures, and surface heterogeneities have been investigated. Our current investigation revealed that oxygen-containing functional groups will act to enhance the CO2-surface adsorption. CO2 is preferentially adsorbed in the oxygen-containing functionalized graphitic slit pores over N2 and CH4 due to its strong permanent quadrupole moment. Furthermore, an algorithm of pore-size distribution (PSD) optimization is developed and verified by testing several carbon-based samples on comparing the simulated adsorption isotherms with available experimental adsorption data, including activated carbon (AC) and gas shale rocks.
Download or read book Adsorption of Binary Gas Mixtures of Sulfur Dioxide with Light Hydrocarbons on Activated Carbon written by Shou-mean Fang and published by . This book was released on 1971 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adsorption Analysis written by Duong D. Do and published by . This book was released on 1998-01-01 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selective Adsorption of CO2 from Light Gas Mixtures Using a Structurally Dynamic Porous Coordination Polymer written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The selective adsorption of CO2 from mixtures with N2, CH4, and N2O in a dynamic porous coordination polymer (see monomer structure) was evaluated by ATR-FTIR spectroscopy, GC, and SANS. All three techniques indicate highly selective adsorption of CO2 from CO2/CH4 and CO2/N2 mixtures at 30 C, with no selectivity observed for the CO2/N2O system.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activated Carbon Adsorption written by Roop Chand Bansal and published by CRC Press. This book was released on 2005-05-24 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: High surface area, a microporous structure, and a high degree of surface reactivity make activated carbons versatile adsorbents, particularly effective in the adsorption of organic and inorganic pollutants from aqueous solutions. Activated Carbon Adsorption introduces the parameters and mechanisms involved in the activated carbon adsorption
Download or read book Elucidating Adsorption Mechanisms in Carbon Molecular Sieves and Development of New Methodologies for Fast Screening of Gas and Liquid Adsorption Systems written by Babak Shirani and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term “Separation Processes” refers to processes that transform a stream containing a mixture of two or more components into pure or concentrated single component product streams. During the last decades, due to the development of adsorption processes and emerging new porous materials, the adsorption processes are considered to be effective and economic means for separation of different gas and liquid mixtures at different operating conditions. The heart of the adsorption process is the adsorbent, whose performance determines the efficiency of the separation system. As a result, selecting the appropriate adsorbent is crucial for the specific gas and liquid mixture separation in terms of selectivity, capacity, recovery, and life time. In order to determine the optimum adsorbent for a particular separation of interest, thorough characterization is carried out involving the following measurements and analysis: surface (textural) characterization, adsorption equilibria, and detailed kinetics, e.g., diffusivity. This study provides systematic investigations of measurement techniques that were developed to determine, kinetics, equilibrium and the governing mass transfer mechanism for single and multi-component adsorption in nanoporous adsorbents. The main objective is focused on development and application of new and fast screening methods for adsorbents’ selection, and new as well as extend traditional methodologies to measure equilibrium, and selectivity of gas mixtures and liquid solutions. One of the screening techniques, for liquid adsorption developed in this study, is based on gas chromatography (GC) headspace technique. A new methodology was developed using liquid calibration technique. In addition, the earlier developed vapor calibration headspace technique was extended to non-ideal solutions. The newly developed technique was shown to provide significant advantages, e.g., more time effective as a result of direct liquid composition determination from the sampled vapor phase and using the simpler experimental setup by eliminating the injection of separate vapor streams required by the vapor calibration technique. Binary and multi-component solutions were also analyzed by applying both GC headspace techniques. Another important fast screening technique (differential column technique) was developed in this study for binary gas mixture analysis, e.g., adsorption of binary mixtures of CO2, CO and C2H4 on NaY zeolite. The novel technique measures binary mixture isotherms accurately and time effectively utilizing a simple experimental setup based on the fractional desorption measurements. The proposed techniques were compared to standard characterization techniques, e.g., gravimetric and chromatographic, to prove reliability of the proposed methods. A number of adsorption systems, e.g., CO2, CO, light hydrocarbons, ethylene and xylene isomers on zeolites and carbon molecular sieves, were chosen for the development and application of these methods. In addition, an in depth study was conducted to elucidate sorption mechanisms of adsorption systems where separation is controlled by complex kinetic-steric effects, as in a case of carbon molecular sieves (CMS) for separation of smaller molecules.
