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论文类型：期刊论文

发表时间：2009-08-25

发表刊物：CATALYSIS COMMUNICATIONS

收录刊物：SCIE、EI

卷号：10

期号：14

页面范围：1804-1807

ISSN号：1566-7367

关键字：Core-shell catalyst; Nickel catalyst; Fuel cell; Methane steam reforming; Catalyst deactivation; Zeolite membrane

摘要：A thin layer of silicalite-1 zeolite membrane was grown on the surface of Ni/SiO(2) and Ni/Al(2)O(3) catalyst beads after seeding and secondary regrowth to create core-shell catalysts that are resistant to alkali poisoning from direct internal reforming-mol ten carbonate fuel cell (DIR-MCFC). The zeolite shell thickness was optimized to prevent poisoning and minimize diffusion resistance. An out-of-cell test was designed to simulate the fuel cell operating conditions, which showed that the new core-shell catalysts maintained a high activity similar to the original fresh catalyst in spite of the exposure to alkali vapor at high temperature. The conventional Ni/SiO(2) and Ni/Al(2)O(3) catalysts suffered higher than 80% decrease in activity for steam reforming of methane reaction (SRM). (c) 2009 Elsevier B.V. All rights reserved.