On stability and performance of highly c-oriented columnar AlPO₄-5 and CoAPO-5 membranes

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• 作者：Jared A. Stoeger^a ; Charitomeni M. Veziri^b ; Miguel Palomino^c ; Avelino Corma^c ; Nick K. Kanellopoulos^b ; Michael Tsapatsis^a ; Georgios N. Karanikolos^b ;   ; ^{karanikolos@chem.demokritos.gr}
• 关键词：AlPO₄-5 ; CoAPO-5 ; Membrane ; Rapid thermal processing ; Pervaporation
• 刊名：Microporous and Mesoporous Materials
• 出版年：2012
• 出版时间：January 2012
• 年：2012
• 卷：147
• 期：1
• 页码：286-294
• 全文大小：1488 K

文摘

Continuous films comprised of highly c-oriented aluminophosphate AlPO₄-5 or cobalt-substituted AlPO₄-5 (CoAPO-5) were grown on porous supports and subjected to heat treatment in order to investigate the potential for membrane applications. A study in the early stages of in-plane crystalline intergrowth revealed a potential mechanism for flake-like crystal formation between the original oriented columnar crystals. Variations in metal substitution (AlPO₄-5, CoAPO-5), support (glass, silicon, porous alumina), and calcination method (conventional, rapid thermal processing) were chosen to examine the conditions by which structural integrity was compromised following secondary (or tertiary) growth, resulting in reduced membrane functionality. Through the use of rapid thermal processing, the structure debilitation could be partially avoided. The membrane quality was inspected through pervaporation measurements consisting of a liquid hydrocarbon feed of n-heptane and 1,3,5-triisopropylbenzene. By investigating the effect of template removal on the oriented, columnar crystalline structure, useful insight is provided into the potential for the membranes to participate in applications such as molecular separations, catalysis, or host¨Cguest assemblies.