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论文类型：期刊论文

发表时间：2014-07-09

发表刊物：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录刊物：SCIE、EI、Scopus

卷号：53

期号：27

页面范围：10906-10913

ISSN号：0888-5885

摘要：In this work, we fabricated a new type of Pd/SiO2@ZIF-8 core-shell catalyst composed of a Pd/SiO2 microsphere as the core and a ZIF-8 membrane as the shell. The preparation procedure involves first loading Pd nanoparticles onto nonporous SiO2 microspheres to obtain the Pd/SiO2 core and then coating a perfect layer of ZIF-8 shell on the core by electrostatic induction to form a Pd/SiO2@ZIF-8 core-shell structure. It is crucial that the modification of the Pd/SiO2 core with polyelectrolyte was employed to improve the charge distribution of the core surface and preferably adsorb Zn2+ cations in the synthesis solution so as to assist the formation of a continuous ZIF-8 shell. The compactness and thickness of the shell were optimized by increasing the number of cycles of ZIF-8 growth. The hydrogenations of alkenes with different molecular sizes showed that the Pd/SiO2@ZIF-8 catalysts can provide excellent product selectivity and antipoisoning and antileaching properties for the hydrogenations of alkenes.