Preparation of Pd/Al2O3@ZIF-8 core-shell catalyst by ZnO-induced growth and its catalytic properties

doi:10.11949/j.issn.0438-1157.20150280

Abstract

Abstract:

A novel Pd/Al₂O₃@ZIF-8 core-shell catalyst was successfully prepared by ZnO-induced coating of a layer of ZIF-8 shell over the Pd/Al₂O₃ bead with a mean diameter of 1—2 mm. The obtained Pd/Al₂O₃@ZIF-8 core-shell catalyst was characterized by XRD, EDX, SEM and ICP analysis techniques, and employed as catalyst for the liquid-phase hydrogenation of alkenes. It was found that the introduction of ZnO layer and subsequent pretreatment of the ZnO layer played vital roles in the formation of continuous and compact ZIF-8 shell. Furthermore, the thickness of the ZIF-8 shell could be tuned by altering the assembly cycles of ZIF-8. Results of the catalytic reactions showed that the Pd/Al₂O₃@ZIF-8 catalyst exhibited better size-selectivity, poison-resistance and leaching-proof properties in contrast to the naked Pd/Al₂O₃ catalyst.

Key words: catalyst, core-shell structure, ZIF-8, membrane, hydrogenation

摘要：

利用同源氧化锌有利于ZIF-8结构的成核生长原理,采用粒径为1~2 mm 的负载型Pd/Al₂O₃微球作为核、ZIF-8膜作为外壳,ZnO诱导生长制备了Pd/Al₂O₃@ZIF-8核壳催化剂,用XRD、EDX、SEM、ICP等分析手段对其结构进行了表征,并采用不同大小分子烯烃加氢反应对其壳层连续完整性进行了性能测试。结果表明,Pd/Al₂O₃微球表面预先引入的ZnO纳米粒子层对外层连续ZIF-8膜壳层的形成,起到了很好的成核生长点和连接点的作用,诱导合成了连续完整的ZIF-8膜包覆的Pd/Al₂O₃@ZIF-8核壳结构材料,ZIF-8膜层的厚度可通过ZIF-8合成的次数进行调变。该Pd/Al₂O₃@ZIF-8核壳催化剂对不同分子大小的烯烃加氢反应表现出明显的筛分选择性,并对外加苯并噻唑作为毒物分子的反应体系具有良好的抗中毒性能和防催化活性金属Pd组分流失的功能。

关键词: 催化剂, 核-壳结构, ZIF-8, 膜, 加氢

CLC Number:

O643

ZHANG Zuqiang, ZHANG Tong, ZHANG Xiongfu. Preparation of Pd/Al₂O₃@ZIF-8 core-shell catalyst by ZnO-induced growth and its catalytic properties[J]. CIESC Journal, 2015, 66(10): 3925-3930.

张祖强, 张通, 张雄福. ZnO诱导的Pd/Al₂O₃@ZIF-8核壳催化剂制备及其催化性能[J]. 化工学报, 2015, 66(10): 3925-3930.

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Preparation of Pd/Al₂O₃@ZIF-8 core-shell catalyst by ZnO-induced growth and its catalytic properties

ZnO诱导的Pd/Al₂O₃@ZIF-8核壳催化剂制备及其催化性能

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