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 Development of Design Information for Molecular sieve Type Regenerative CO2 removal Systems written by R. M. Wright and published by . This book was released on 1973 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adsorption of Light Gases and Gas Mixtures on Zeolites and Nanoporous Carbons written by Lucas Mitchell and published by . This book was released on 2014 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Capture written by Jennifer Wilcox and published by Springer Science & Business Media. This book was released on 2012-03-28 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book approaches the energy science sub-field carbon capture with an interdisciplinary discussion based upon fundamental chemical concepts ranging from thermodynamics, combustion, kinetics, mass transfer, material properties, and the relationship between the chemistry and process of carbon capture technologies. Energy science itself is a broad field that spans many disciplines -- policy, mathematics, physical chemistry, chemical engineering, geology, materials science and mineralogy -- and the author has selected the material, as well as end-of-chapter problems and policy discussions, that provide the necessary tools to interested students.
Download or read book A Thermodynamic Study of Nitrogen and Carbon Dioxide Adsorption on Alkali exchanged Chabazite Zeolites written by Firas N. Ridha and published by . This book was released on 2009 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolites have long been considered as excellent candidate materials for gas separation and purification. Most of the worldwide industrial adsorption applications of molecular sieve zeolites utilize zeolites X, A and Y. Chabazite zeolite however, has pore dimensions between those for zeolites X, A and Y and hence has promising separation features for specific application but has not been utilized in any major industrial separation or purification applications to date. Some early work on alkali-exchanged chabazites revealed a diminished porosity and surface area due to pore blockage. This initial work was based on limited experimental data and preliminary analytical techniques and analysis. As a result, this initial pessimistic assessment of the merits of chabazite zeolite has led to a loss of interest in this material for adsorption applications.In this study, a pure phase chabazite was synthesized and ion-exchanged to produce potassium chabazite (KCHA), sodium chabazite (NaCHA) and lithium chabazite (LiCHA). Attempts were successful to produce a fully exchanged potassium chabazite, which is a unique product that has not been reported in the literature to date. The adsorption of nitrogen and carbon dioxide was studied since these gases are component of flue gas and the application to which chabazites were to be directed was CO2 capture form flue gas. Adsorption equilibrium isotherms for CO2 and N2 were measured at pressures up to 101.3 kPa and temperatures of 273, 303 and 333 K. More importantly, this work focused on determining fundamental properties of adsorbate-adsorbent interactions which require low pressure measurements hence low pressure isotherms, down to 0.001 kPa, were measured. These data provide valuable information to study the adsorption behavior in the Henry's law region.The results showed that porosity characterization of KCHA using the conventional approach of nitrogen at 77 K reveals a surface area of only 17.82 m2 g-1 and a diminished pore volume (by density functional calculation) of 0.005 cm3 g-1, compared to 584.4 m2 g-1 and 0.214 cm3 g-1 using carbon dioxide at 273 K, respectively, calculated from the revised Tóth model and CO2 isotherm data at 273K. These findings strongly suggested that KCHA is a highly porous adsorbent, in spite of the large size of K+ ions which block access of the N2 molecules to the pore space. It is concluded that traditional methods of characterization are not suitable in the case of pore blockage leading to incorrect interpretation of adsorbent properties.It was initially hypothesized that carbon dioxide molecules enjoy large freedom within the zeolite pores, however, virial plots developed from equilibrium isotherms showed anomalous behavior for carbon dioxide adsorption at 273 K on NaCHA and KCHA at loadings lower than 1.5 gmole kg-1, which correspond to pressure of about 0.15 kPa. This suggested that carbon dioxide molecules were not at true equilibrium condition, but rather were subject to steric hindrance due to partial pore blockage. Adsorbed phase densities calculated from van der Waals constants confirmed the pore blockage phenomenon on KCHA, however, it also reveals a slight blockage against nitrogen molecules on NaCHA. On the synthesized chabazites, carbon dioxide affinities and heats of adsorption were considerably higher than those for nitrogen for which their adsorption equilibria differ significantly due to screening against nitrogen molecules in KCHA and partially in NaCHA. Carbon dioxide entropy measurement revealed a concave trend, demonstrating an appreciable loss of degrees of freedom within increase in loading.Carbon dioxide desorption isotherms showed low pressure hysteresis at 273 K with residuals of 0.37 and 0.57 molecule cavity-1 on NaCHA and KCHA, respectively, at pressures lower than 0.05 kPa. This outcome confirmed the pore blockage occurrence suggesting a low pressure encapsulation. The combined use of the statistical theory of the radial distribution function (rdf) and the theory of the perfect 3D lattice gas to describe the encapsulation process underestimated the number of accommodated molecules compared to the experimental results. The individual implementation of Lennard-Jones and quadrupolar potentials to describe the adsorbate-adsorbate and adsorbate-host interactions, respectively, affected the performance of the models.
Download or read book New and Future Developments in Catalysis written by Arnošt Zukal and published by Elsevier Inc. Chapters. This book was released on 2013-07-11 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling of Adsorption and Diffusion of Vapors in Zeolites written by Jan-Baptist Willem Peter Loos and published by . This book was released on 1997 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Adsorption Equilibria written by Jürgen U. Keller and published by Springer Science & Business Media. This book was released on 2006-06-23 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended to present for the first time experimental methods to measure equilibria states of pure and mixed gases being adsorbed on the surface of solid materials. It has been written for engineers and scientists from industry and academia who are interested in adsorption based gas separation processes and/or in using gas adsorption for characterization of the porosity of solid materials. This book is the result of a fruitful collaboration of a theoretician (JUK) and an experimentalist (RS) over more than twelve years in the field of gas adsorption systems at the Institute of Fluid- and Thermodynamics (IFT) at the University of Siegen, Siegen, Germany. This collaboration resulted in the development of several new methods to measure not only pure gas adsorption, but gas mixture or coadsorption equilibria on inert porous solids. Also several new theoretical results could be achieved leading to new types of so-called adsorption isotherms based on the concepts of molecular association and – phenomenologically speaking – on that of thermodynamic phases of fractal dimension. Naturally, results of international collaboration of the authors over the years (1980-2000) also are included.
Download or read book CO2 Adsorption Equilibria on 5A and 13X Molecular Sieves at Elevated Carrier Gas Pressures written by David T. Croft and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An automated volumetric isotherm system capable of measuring adsorption equilibria of trace levels of contaminants from 1 to 10,000 ppm in carrier gas up to 3.5 x 10(exp 6) Pa has been developed. The system is a modified version of the volumetric isotherm system previously published by Mahle, et al. The system is used to measure isotherm data for CO2, a typical contaminant in both separation and purification processes, adsorbed on two commercially available adsorbents, 5A molecular sieve and 13X molecular sieve. These data are measured in the presence of air at pressures of 1.0 x 10(exp 5) Pa, 5.0 x 10 to the 5th power Pa, 2.5 x 10(exp 6) Pa, and at temperatures of 278 K, 298 K, and 317 K. Results show that air adsorbed at elevated pressures reduces the amount of CO2 adsorbed at a given partial pressure and temperature for both adsorbents. The effect of adsorbed air on the CO2 loading is greater for 5A molecular sieve than for the 13X molecular sieve. Data are correlated using the Dubinin- Radushkevich Equation, which fits the data very well at low pressure but becomes increasingly less representative at elevated pressures.
Download or read book Adsorption Technology and Design written by W John Thomas, FEng and published by Butterworth-Heinemann. This book was released on 1998-04-27 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to provide all those involved in designing and running adsorption processes with a guide to adsorption technology and design.
Download or read book CO2 Adsorption Equilibria on 5A and 13X Molecular Sieves at Elevated Carrier Gas Pressures written by David T. Croft and published by . This book was released on 1997 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Dioxide Thermodynamics Kinetics and Mass Transfer written by Xi Chen and published by LAP Lambert Academic Publishing. This book was released on 2011-12 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: To screen amine solvents for application in CO2 capture from coal-fired power plants, the equilibrium CO2 partial pressure and liquid film mass transfer coefficient were characterized for CO2-loaded and highly concentrated aqueous amines at 40 - 100 C over a range of CO2 loading. Promising solvents with large CO2 capacity, fast mass transfer rate and moderately high heat of absorption were identified. A rigorous thermodynamic model was developed for a selected amine solvent in the framework of the Electrolyte Nonrandom Two-Liquid model using the vapor-liquid-equilibrium and liquid speciation data. The lab-scale mass transfer rate data was represented with a rate-based model created in Aspen Plus(r), in which the reaction rate was described with activity-based termolecular mechanism. The rate-based model can be used for design and simulation of large-scale CO2 capture process."
Download or read book Effect of Surface Groups on Adsorption of Pollutants written by Robert W. Coughlin and published by . This book was released on 1970 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Exchange Adsorption of Ions from Aqueous Solutions by Organic Zeolites written by G. E. Boyd and published by . This book was released on 1947 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Thermodynamic Study of Nitrogen and Carbon Dioxide Adsorption on Alkali exchanged Chabazite Zeolites written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zeolites have long been considered as excellent candidate materials for gas separation and purification. Most of the worldwide industrial adsorption applications of molecular sieve zeolites utilize zeolites X, A and Y. Chabazite zeolite however, has pore dimensions between those for zeolites X, A and Y and hence has promising separation features for specific application but has not been utilized in any major industrial separation or purification applications to date. Some early work on alkali-exchanged chabazites revealed a diminished porosity and surface area due to pore blockage. This initial work was based on limited experimental data and preliminary analytical techniques and analysis. As a result, this initial pessimistic assessment of the merits of chabazite zeolite has led to a loss of interest in this material for adsorption applications. In this study, a pure phase chabazite was synthesized and ion-exchanged to produce potassium chabazite (KCHA), sodium chabazite (NaCHA) and lithium chabazite (LiCHA). Attempts were successful to produce a fully exchanged potassium chabazite, which is a unique product that has not been reported in the literature to date. The adsorption of nitrogen and carbon dioxide was studied since these gases are component of flue gas and the application to which chabazites were to be directed was CO2 capture form flue gas. Adsorption equilibrium isotherms for CO2 and N2 were measured at pressures up to 101.3 kPa and temperatures of 273, 303 and 333 K. More importantly, this work focused on determining fundamental properties of adsorbate-adsorbent interactions which require low pressure measurements hence low pressure isotherms, down to 0.001 kPa, were measured. These data provide valuable information to study the adsorption behavior in the Henry's law region. The results showed that porosity characterization of KCHA using the conventional approach of nitrogen at 77 K reveals a surface area of only 17.82 m2 g-1 and a diminished pore volume.
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 The Adsorption of Straight Chain Hydrocarbons from Ternary Liquid Solutions by 5A Molecular Sieve Crystals written by Moinuddin Hasan Ali and published by . This book was released on 1975 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
