Hydrogen-permeable membranes composed of zeolite nano-blocks

Porous Inorganic Membranes for CO2 Capture: Present and Prospects

“…More recent studies have also reported the synthesis of membranes via sol–gel techniques using partially decomposed zeolites as precursors. For instance, Nishiyama et al reported the synthesis of silica/alumina membranes starting from dealuminated LTA zeolite using HCl. The final sol was then spin-coated on a Vycor glass plate to obtain microporous membranes based on zeolite nanoblocks, keeping the local structure of the zeolite but lacking eight-membered oxygen rings as permeable pores.…”

Molecular Simulation for Adsorption and Separation of CH4/H2 in Zeolitic Imidazolate Frameworks

“…This is because the pore size of SAPO-34 is 0.38 nm, similar to the kinetic diameter of CH 4 (0.38 nm) but larger than that of H 2 (0.29 nm), indicating that SAPO-34 can capture CH 4 molecules strongly, leaving H 2 molecules diffuse in pores. A novel NaA zeolite membrane, 14 modified by eliminating the eight-membered rings, shows very high separation factors for H 2 /CH 4 (>1200), H 2 /N 2 (>1600), and H 2 /CO (>660) due to the existence of four-and six-membered rings, which favor the permiability of H 2 . The H 2 separation performance and mechanisms of zeolite membranes were summarized by Ockwig et al, 11 who predicted that zeolite membranes will be put at the forefront of separation technology owing to their chemical, mechanical, and thermal stabilities and high selectivities.…”

Ion-Exchanged Silicoaluminophosphate-34 Membrane for Efficient CO2/N2 Separation with Low CO2 Concentration in the Gas Mixture

“…Membrane separation technology appears to be an energy-efficient alternative for gas separation in view of its advantages including relatively lower capital costs and simplicity in operation versus conventional separation technologies. ,, Because of their advantages, including high chemical and mechanical stability and well-defined pore structure, various types of zeolite membranes are being investigated by different researchers, and these zeolite membranes appear to be potential candidates for gas separation. − These include MFI, − FAU, − A-type, − DDR, , T-type, , and silicoaluminophosphate-34 (SAPO-34) ,, and CHA zeolite membranes . Zeolite membranes such as SAPO-34 have gained importance for gas separation because of their small pore structure.…”