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Controllably Confined ZnO on USY Zeolites (USY@ZnO/Al 2 O 3 ) as Efficient Lewis Acid Catalysts for Baeyer–Villiger Oxidation
Author(s) -
Wang Bo,
Xu Hao,
Ding Yu,
Zhu Zhiguo,
Wang Darui,
Guan Yejun,
Wu Haihong,
Wu Peng
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201800218
Subject(s) - calcination , zeolite , catalysis , hydroxide , lewis acids and bases , phase (matter) , porosity , materials science , inorganic chemistry , aluminium , chemical engineering , chemistry , organic chemistry , metallurgy , composite material , engineering
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/Al 2 O 3 composite that was still firmly anchored on the USY zeolite, without sacrificing the core–shell structure. The resultant USY@ZnO/Al 2 O 3 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 H 2 O 2 or bulky tert ‐butyl hydroxide as an oxidant.