Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al2O3) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation,Chemistry - An Asian Journal

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Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al2O3) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-04-16 , DOI: 10.1002/asia.201800218
Bo Wang ₁ , Hao Xu ₁ , Yu Ding ₁ , Zhiguo Zhu ₁ , Darui Wang _{1,

2} , Yejun Guan ₁ , Haihong Wu ₁ , Peng Wu ₁

Affiliation

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/Al₂O₃ composite that was still firmly anchored on the USY zeolite, without sacrificing the core–shell structure. The resultant USY@ZnO/Al₂O₃ materials gave rise to unique Lewis acidity and hierarchical porosity, which endowed the catalyst with promising performance in the Baeyer–Villiger oxidation of ketones with H₂O₂ or bulky tert‐butyl hydroxide as an oxidant.

中文翻译：

USY沸石（USY @ ZnO / Al2O3）上可控受限的ZnO作为有效的路易斯酸催化剂，用于Bayerer-Villiger氧化

通过独特的原位生长方法，ZnU-LDHs（层状双氢氧化物）相很容易在USY沸石表面形成，这得益于添加的Zn源与从富含Al的USY沸石晶体中提取的铝物种之间的相互作用。铝的迁移以及与外部锌源的同时相互作用在一个罐中发生，从而形成了覆盖在USY晶体表面的ZnAl-LDHs相。煅烧后，ZnAl-LDHs相转变为ZnO / Al ₂ O ₃复合物，该复合物仍牢固地锚固在USY沸石上，而不会牺牲核-壳结构。生成的USY @ ZnO / Al ₂ O ₃原料产生了独特的路易斯酸度和分级孔隙度，这使该催化剂在以H ₂ O ₂或大体积叔丁基氢氧化物为氧化剂的酮的拜耳-维利格氧化中具有可观的性能。

更新日期：2018-04-16

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