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Insight into Ce Doping Induced Oxygen Vacancies over Ce‐Doped Mno 2 Catalysts for Imine Synthesis
Author(s) -
Shen Haidong,
Bu Jun,
Wang Wenbin,
Wu Chen,
Cao Yueling,
Zhang Baoliang,
Zhang Qiuyu,
Zhang Hepeng
Publication year - 2020
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.202000155
Subject(s) - chemistry , catalysis , doping , oxygen , aniline , amorphous solid , oxide , transition metal , inorganic chemistry , selectivity , chemical engineering , organic chemistry , materials science , optoelectronics , engineering
Summary of main observation and conclusion The pursuit of modern sustainable chemistry has stimulated the development of innovative catalytic processes that enable chemical transformations to be performed under mild and clean conditions with high efficiency. Here, an amorphous sheet‐like MnO 2 (Ce‐doped MnO 2 : CMBO) was obtained after Ce doping, which exhibits excellent catalytic performance for the oxidation coupling of alcohol and aniline. Conversion of 99% and a selectivity of 99% could be achieved within 6 h at 60 o C under air atmosphere, and the formation rate of target product was up to 30.2 μmol·h –1 ·m –2 . Based on a series of characterizations, it was found that the doping of Ce into the MnO 2 could increase the concentration of the oxygen vacancies, thus forming abundant active surface oxygen species and favoring the mobility of lattice oxygen, which are the main reasons for the greatly enhanced catalytic performance of CMBO. This work indicates that increasing oxygen vacancy by element doping may serve as a facile and efficient way to enhance catalytic performance of transition metal oxide.