Kr/Xe Separation over a Chabazite Zeolite Membrane

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• 作者：Xuhui Feng ; Zhaowang Zong ; Sameh K. Elsaidi ; Jacek B. Jasinski ; Rajamani Krishna ; Praveen K. Thallapally ; Moises A. Carreon
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：138
• 期：31
• 页码：9791-9794
• 全文大小：300K
• 年卷期：0
• ISSN：1520-5126

文摘

Herein we demonstrate that chabazite zeolite SAPO-34 membranes effectively separated Kr/Xe gas mixtures at industrially relevant compositions. Control over membrane thickness and average crystal size led to industrial range permeances and high separation selectivities. Specifically, SAPO-34 membranes can separate Kr/Xe mixtures with Kr permeances as high as 1.2 × 10 ^–7 mol/m² s Pa and separation selectivities of 35 for molar compositions close to typical concentrations of these two gases in air. In addition, SAPO-34 membranes separated Kr/Xe mixtures with Kr permeances as high as 1.2 × 10 ^–7 mol/m² s Pa and separation selectivities up to 45 for molar compositions as might be encountered in nuclear reprocessing technologies. Molecular sieving and differences in diffusivities were identified as the dominant separation mechanisms.