TiO2/Al2O3 复合载体的气体传质模拟与结构优化

Translated title of the contribution: Gas mass transfer simulation and structure optimization of TiO2/Al2O3 composite support

Xiang Jin, Jia Li Fu, Qing Yang Lyu, Xue Chao Gao, Xue Hong Gu

Research output: Contribution to journalArticlepeer-review

Abstract

In order to optimize the structure of TiO2/Al2O3 composite support for the preparation of high flux all-silica Deca-Dodecasil 3R(DD3R) zeolite membrane, a gas mass transfer model based on viscous flow and Knudsen diffusion was established, and the required parameters of the model were obtained through experiments. The effects of operating conditions and structural parameters on gas penetration in the composite support were systematically examined. The calculated results of single-component gas flowrate show remarkable agreement with the experiments and the model reliability was verified. The simulation results indicate that increasing pressure or decreasing temperature could inhibit the influence of Knudsen diffusion in gas permeation. Furthermore, the mass transfer resistance is mainly concentrated in the TiO2 layer and sponge-like layer when CO2 permeates through the multi-layer asymmetric structure of the composite support. Finally, based on the existing works of DD3R zeolite membranes, contour maps of the ratio of CO2 permeance between the composite support and the zeolite membrane were established to reveal the synergistic effect of the structural parameters (pore size and layer thickness of the TiO2 layer and sponge-like layer) on gas permeance of TiO2/Al2O3 composite support.

Translated title of the contributionGas mass transfer simulation and structure optimization of TiO2/Al2O3 composite support
Original languageChinese (Traditional)
Pages (from-to)45-52
Number of pages8
JournalGao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities
Volume37
Issue number1
DOIs
StatePublished - Feb 2023

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