Natural zeolite-based cement composite membranes for H₂/CO₂ separation

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• 作者：Amir Hossein Shafie ; Weizhu An ; Sayed Alireza Hosseinzadeh Hejazi ; James A. Sawada ; Steven M. Kuznicki ; ^{steve.kuznicki@ualberta.ca}
• 关键词：Zeolite ; Membrane ; Clinoptilolite ; Gas separations ; Hydrogen
• 刊名：Separation and Purification Technology
• 出版年：2012
• 期刊代码：78_13835866
• 类别：ce
• 出版时间：22 March, 2012
• 卷：88
• 期：Complete
• 页码：24-28
• 文件大小：647 K

摘要

Natural zeolite-based membranes have shown promise in the separation of H₂ from CO₂ and hydrocarbons. However, these highly dense, naturally monolithic materials can suffer defects, which disrupt the continuity of the zeolite micropores and create leak paths through the membrane. Cement materials were explored as a component to generate natural zeolite-based cement composite membranes because of their ability to intergrow between the zeolite particles. The influence of operating pressures and temperatures on the performance of the natural zeolite-based cement composite membranes was examined. Gas permeation tests indicated that permeation through the membrane (thickness of 1.8-2.2 mm) was an activated diffusion process and the experiments measured a hydrogen permeance of 4.1 脳 10^鈭? mol m^鈭? s^鈭? Pa^鈭? and a H₂/CO₂ single gas selectivity of 25 at 25 掳C and 100 kPa.