Correlation of permeance of individual component with its molecular weight at different temperatures (solid curves are for visual guide) (Ref. 39).
Schematic depiction of the zeolite membrane formation on a porous substrate: (a) nucleation on the surface and (b) crystal growth into the continuous polycrystalline membrane.
Topological structures of the ten-member ring MFI zeolite pore openings.
MFI-type zeolite membrane synthesized by seeded secondary growth method: (a) and (b) surface and cross section of the nanoparticle seed layer and (c) and (d) surface and cross section of the resultant zeolite membrane after secondary growth from a template free precursor solution.
Structure of the eight-member ring DDR zeolite pore opening.
SEM pictures of a DDR-type zeolite membrane: (a) surface and (b) cross section (Ref. 52).
Permeation of equimolar gas mixture during the process of membrane modification (Ref. 55).
Single gas permeation as a function of temperature before and after membrane modification: (a) permeance and (b) permselectivity.
Calculated activation energy of gas diffusion for counterdiffusion CVD modified MFI-type (circle symbols) zeolite membranes and that of counterdiffusion CVD modified DDR-type (square symbols) zeolite membranes (Ref. 52) as a function of the ratio of kinetic diameter of the diffusion gas molecule to the zeolite pore diameter .
TEM image of the cross section of a microporous silica membrane prepared by sol-gel technique on an alumina substrate (Ref. 105).
Gas permeance through sol-gel-derived microporous silica membranes at different temperatures (Refs. 128 and 129).
Long-term hydrothermal stability between the pure silica membrane and the composite membrane 03Si–Al prepared using a molar ratio of TEOS/aluminum-tri-sec-butoxide of 33.3 (Ref. 133).
Proposed mechanism of the pore structure stabilization in the CTMSS material as opposed to the hydrothermal instability of the MSS material (Ref. 140).
Molecular size dependence of permeation in the silica/-alumina multilayer membrane at (Ref. 143).
Kinetic diameter and molecular mass for some small gases.
Single gas permeance through MFI zeolite membrane at elevated temperatures.
Single gas permeation in DDR-type membranes.
Summary of reported gas separation results of CVD-derived silica membranes.
Summary of reported gas separation results of sol-gel-derived silica membranes.
Summary of reported separation in metal-doped silica membranes.
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