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- W1963622480 abstract "Since the micropore size of Y-type zeolite is in the range of 0.74–1.2nm, small molecules are able to pass one another inside the micropores. Thus ion-exchanged Y-type zeolite membranes are expected to show catalytic activity as well as being useful for gas separation with high permeation rates. In this study, NaY-type zeolite membranes were synthesized by a hydrothermal reaction on the inner surface of a porous α-alumina support tube. The Y-type zeolite membranes were stable to heat at temperatures up to 400°C, and the permeances to single-component hydrocarbons showed a maximum at temperatures that were dependent on the heat of adsorption. The permeances to C3H6, n-C4H10 and i-C4H10 decreased with time at elevated temperatures. This can be explained by the deposition of carbonaceous matter, which was removed by a heat treatment in an atmosphere of O2 at 300–400°C. The permeation mechanism for the NaY-type zeolite membrane was investigated for single-component CO2. The Maxwell–Stefan diffusivities were compared with the Fickian diffusivities obtained using a sorption–diffusion model, in which linear concentration profiles across the membrane were assumed. The differences between the Fickian diffusivities and the Maxwell–Stefan diffusivities were negligible at elevated temperatures." @default.
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- W1963622480 date "2001-07-01" @default.
- W1963622480 modified "2023-09-23" @default.
- W1963622480 title "Effect of temperature on the gas permeation properties of NaY-type zeolite formed on the inner surface of a porous support tube" @default.
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- W1963622480 doi "https://doi.org/10.1016/s0009-2509(01)00106-3" @default.
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