Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al2O3) as Efficient Lewis Acid Catalysts for Baeyer-Villiger Oxidation
Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al2O3) as Efficient Lewis Acid Catalysts for Baeyer-Villiger Oxidation
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USY 沸石上可控限制的 ZnO (USY@ZnO/Al2O3) 作为拜耳-维利格氧化的高效路易斯酸催化剂
DOI：
10.1002/asia.201800218
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发表时间：
2018
影响因子：
4.1
通讯作者：
Wu Peng
中科院分区：
文献类型：
--
作者：
Wang Bo;Xu Hao;Ding Yu;Zhu Zhiguo;Wang Darui;Guan Yejun;Wu Haihong;Wu Peng
ZnAl-LDHs（层状双氢氧化物）相通过独特的原位生长方法容易地在USY沸石的表面上形成，该原位生长方法受益于添加的Zn源和从富含Al的USY沸石晶体中提取的铝物质的相互作用。铝的迁移和与外部Zn源的同时相互作用在一锅中发生，以形成涂覆在USY晶体表面上的ZnAl-LDHs相。煅烧后，ZnAl-LDHS相转化为ZnO/Al 2 O3复合材料，该复合材料仍然牢固地锚定在USY沸石上，而不牺牲核壳结构。该催化剂具有独特的刘易斯酸性和分级孔隙结构，在以H2 O2或氢氧化叔丁基为氧化剂的Baeyer-Villiger氧化反应中表现出良好的催化性能.
A ZnAl‐LDHs (layered double hydroxides) phase was readily formed on the surface of a USY zeolite through a distinctive in situ growth method that benefitted from the interaction of the added Zn source and aluminum species extracted from the Al‐rich USY zeolite crystals. The migration of aluminum and simultaneous interaction with the external Zn source took place in one pot to form a ZnAl‐LDHs phase coated on the surface of the USY crystals. Upon calcination, the ZnAl‐LDHs phase was transformed into a ZnO/Al2O3composite that was still firmly anchored on the USY zeolite, without sacrificing the core–shell structure. The resultant USY@ZnO/Al2O3materials gave rise to unique Lewis acidity and hierarchical porosity, which endowed the catalyst with promising performance in the Baeyer–Villiger oxidation of ketones with H2O2or bulkytert‐butyl hydroxide as an oxidant.