New Pd/SiO2@ZIF-8 Core鈥揝hell Catalyst with Selective, Antipoisoning, and Antileaching Properties for the Hydrogenation of Alkenes

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• 作者：Lu Lin ; Tong Zhang ; Xiongfu Zhang ; Haiou Liu ; King Lun Yeung ; Jieshan Qiu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 9, 2014
• 年：2014
• 卷：53
• 期：27
• 页码：10906-10913
• 全文大小：410K
• ISSN：1520-5045

文摘

In this work, we fabricated a new type of Pd/SiO₂@ZIF-8 core鈥搒hell 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鈥搒hell 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.