选择性
沸石
吸附
膜
化学工程
化学
大气温度范围
气体分离
扩散
选择性吸附
无机化学
材料科学
催化作用
有机化学
热力学
生物化学
工程类
物理
作者
Pasquale F. Zito,Alessio Caravella,Adele Brunetti,Enrico Drioli,Giuseppe Barbieri
标识
DOI:10.1021/acs.iecr.8b02707
摘要
Using DD3R, silicalite and NaY zeolite membrane for gas separation is an attractive prospect for the development of a sustainable green process industry. The interest in CO2 and H2 lies in their relatively strong and weak adsorption in zeolite, respectively, causing a peculiar behavior of membrane selectivity, which is here evaluated in a wide range of temperature (273–573 K), feed pressure (100–500 kPa) and CO2 molar fraction (0.05–0.95). As a result, CO2/H2 selectivity of the considered zeolite is found to be high at a low temperature owing to the relatively strong CO2 adsorption with respect to the weak H2 one. Differently, selectivity is much lower at a higher temperature because of the reduced adsorption strength. The temperature strongly affects the membrane selectivity through surface diffusion closely correlated to gas adsorption, and CO2 adsorption results responsible for the high membrane selectivity in the low-temperature range.
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