Journal ArticleDOI
Synthesis and Permeation Properties of a DDR-Type Zeolite Membrane for Separation of CO2/CH4 Gaseous Mixtures
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In this article, a highly hydrophobic DDR-type zeolite membrane was prepared on the outer surface of a porous α-alumina tube for CO2/CH4 separation.Abstract:
Using hydrothermal synthesis, a highly hydrophobic DDR-type zeolite membrane was prepared on the outer surface of a porous α-alumina tube. The results of this study show that it is useful for CO2/CH4 separation. Single-gas permeation for CO2, CH4, H2, He, N2, and O2, and CO2/CH4 binary gas permeation, were measured, respectively, at pressures up to 5 and 2 MPa. The respective single-gas permeances of CO2 and CH4 at 298 K at a feed pressure of 0.2 MPa and a permeate pressure of 0.1 MPa were 4.2 × 10-7 and 1.2 × 10-9 mol m-2 s-1 Pa-1; the ideal selectivity for CO2/CH4 was 340. The permeances were in the following order: CO2 > H2 > He > O2 > N2 > CH4. Single-gas permeance was dependent on the relative molecular size of the DDR pore diameter. However, CO2 permeance dominated the adsorption affinity to the pore wall of DDR zeolite. In mixed-gas permeation experiments using the sweep method, the DDR-type zeolite membrane showed high selectivity for CO2/CH4 mixtures of 200 and high CO2 permeance of 3.0 × 10-7 m...read more
Citations
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Journal ArticleDOI
Current status and development of membranes for co2/CH4 separation: a review.
TL;DR: In this paper, a review of different types of membranes available for use including their working principles, current status and development which form the primary determinants of separation performance and efficiency is presented.
Journal ArticleDOI
Practical Approach to Zeolitic Membranes and Coatings: State of the Art, Opportunities, Barriers, and Future Perspectives
TL;DR: In this paper, the concept of zeolite (zeolitic) membrane is discussed from a practical perspective, and the limitations of existing synthesis methods are considered and speculation on new opportunities for zeolites and other materials such as metal organic frameworks for the production of membranes.
Journal ArticleDOI
In silico screening of metal–organic frameworks in separation applications
TL;DR: A variety of metrics that quantify the separation performance, such as adsorption selectivity, working capacity, diffusion selectability, and membrane permeability, are determined from a combination of Configurational-Bias Monte Carlo (CBMC) and Molecular Dynamics (MD) simulations.
Journal ArticleDOI
In silico screening of zeolite membranes for CO2 capture
TL;DR: In this paper, the authors used Configurational-Bias Monte Carlo (CBMC) simulations of mixture adsorption isotherms, along with Molecular Dynamics simulations of diffusivities for three binary mixtures, CO 2 /H 2, CO 2/CH 4, and CO 2 2 /N 2, to calculate S ads, S diff, and S perm.
References
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Journal ArticleDOI
Pushing the limits on possibilities for large scale gas separation: which strategies?
William J. Koros,Rajiv Mahajan +1 more
TL;DR: The current spectrum of applications of gas separation membranes include: nitrogen enrichment, oxygen enrichment, hydrogen recovery, acid gas (CO2, H2S) removal from natural gas and dehydration of air and natural gas as discussed by the authors.
Journal ArticleDOI
High-Pressure Adsorption Equilibria of Methane and Carbon Dioxide on Several Activated Carbons
TL;DR: In this article, high-pressure excess adsorption equilibria of methane and carbon dioxide on five microporous activated carbons were measured at temperatures ranging from 273 to 333 K and at pressures ranging from (0.5 to 6000) kPa using a static volumetric apparatus.
Journal ArticleDOI
Application of natural zeolites in the purification and separation of gases
TL;DR: The results of the present study indicate that these natural zeolites are particularly well suited for trace-gas removal, while they are less likely to provide competitive performance in bulk separations as mentioned in this paper.
Journal ArticleDOI
Gas separation characteristics of DDR type zeolite membrane
TL;DR: In this paper, a molecular-sieve DDR type zeolite membrane with an aperture of 0.36 × 0.44 nm was formed on a porous alumina substrate by hydrothermal process.
Journal ArticleDOI
Formation of a Y-Type Zeolite Membrane on a Porous α-Alumina Tube for Gas Separation
TL;DR: In this paper, a porous α-alumina support tube, polished with a finely powdered X-type zeolite for use as seeds, was placed vertically in an autoclave containing an aqueous mixture of water glass and sodium aluminate.