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Selective oxidation of o ‐chlorotoluene to o ‐chlorobenzaldehyde catalyzed by (Co,Mn)(Co,Mn) 2 O 4 catalysts
Author(s) -
Liu Jiangyong,
Zhang Yayun,
Yan Xiaodong,
Wang Zihao,
Wu Faming,
Fang Simeng,
Jian Panming
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23116
Subject(s) - catalysis , manganese , chemistry , cobalt , valence (chemistry) , selectivity , oxidation state , catalytic oxidation , manganese oxide , crystallinity , oxide , redox , inorganic chemistry , organic chemistry , crystallography
Catalytic oxidation of chlorotoluene is an important reaction for the production of chlorobenzaldehyde. Many works have focused on the oxidation of p ‐chlorotoluene, while little attention has been paid to the oxidation of o ‐chlorotoluene (OCT). Herein, we, for the first time, report on the selective oxidation of OCT to o ‐chlorobenzaldehyde (OCBD) with a cobalt‐manganese composite oxide ((Co,Mn)(Co,Mn) 2 O 4 ) as a catalyst and O 2 as a green and free oxidant. The Co centres are slightly more active than the Mn centres toward the catalytic oxidation of OCT. However, the Co sites seem active enough to further oxidize the OCBD to o ‐chlorobenzoic acid. It is also found that the crystallinity of the (Co,Mn)(Co,Mn) 2 O 4 catalysts or the valence state of the surface cations in the catalysts affects the activity and selectivity.