A Novel Dual-Membrane Reactor for Continuous Heterogeneous Oxidation Catalysis

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• 作者：Hong Jiang ; Lie Meng ; Rizhi Chen ; Wanqin Jin ; Weihong Xing ; Nanping Xu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：September 21, 2011
• 年：2011
• 卷：50
• 期：18
• 页码：10458-10464
• 全文大小：909K
• 年卷期：v.50,no.18(September 21, 2011)
• ISSN：1520-5045

文摘

A novel dual-membrane reactor is proposed for heterogeneous catalysis over ultrafine catalyst particles. In this reactor, one tubular porous ceramic membrane is employed as a distributor controlling the supply of reactant, while the other is employed as a membrane separator for in situ separation of ultrafine catalysts from the products. To evaluate the feasibility and the performance of the dual-membrane reactor, phenol hydroxylation with hydrogen peroxide (H₂O₂) over TS-1 catalyst was selected as a model reaction. As compared to traditional H₂O₂ feeding modes, the use of the porous ceramic membrane distributor allows a uniform injection of H₂O₂ into the reaction system, and as a result significantly promotes the dihydroxybenzene selectivity. The phenol conversion and the DHB selectivity above 15% and about 95%, respectively, can be achieved in a continuous operation of 30 h. TS-1 catalysts can be retained almost completely in the reactor system by the membrane separator. Our study demonstrates the advantages of the novel dual-membrane reactor in enhancing selectivity and catalysts separation in a continuous heterogeneous catalytic reaction.