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- W2013474579 abstract "MFI-type zeolite membranes were prepared by the template-free secondary growth method followed by onstream counter-diffusion or one-side chemical vapor deposition (CVD) modification to eliminate intercrystalline pores. Gas permeation and separation experiments were conducted on unmodified and modified membranes at 25−500 °C. For unmodified MFI-type zeolite membranes, single-gas permeation of H2, He, CO, and CO2 exhibits characteristics of Knudsen diffusion up to 500 °C, and adsorption of CO2 on MFI-type zeolite has a strong effect on ternary gas separation (H2, CO, and CO2) below 300 °C. Counter-diffusion CVD modification is effective in sealing the intercrystalline gaps resulting in defect-free MFI-type zeolite membranes. Permeation of nonadsorbing gases (He, H2, and CO) through counter-diffusion CVD-modified zeolite membranes also exhibits Knudsen diffusion characteristics with very small activation energies for diffusion (0.1−3 kJ mol−1), with gas permeance (diffusivity) decreasing with increasing molecular weight. For one-side CVD-modified MFI-type zeolite membranes, gas permeance (diffusivity) decreases and activation energy for diffusion increases with increasing molecular size because of the formation of an amorphous microporous silica layer. High-temperature gas permeation data on defect-free MFI-type zeolite membranes confirm the translational gas diffusion model for zeolites." @default.
- W2013474579 created "2016-06-24" @default.
- W2013474579 creator A5019242403 @default.
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- W2013474579 date "2009-02-05" @default.
- W2013474579 modified "2023-09-26" @default.
- W2013474579 title "Gas Permeation and Diffusion Characteristics of MFI-Type Zeolite Membranes at High Temperatures" @default.
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- W2013474579 doi "https://doi.org/10.1021/jp804586q" @default.
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