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Mesoporous SiO 2 ‐Encapsulated Nano‐Co 3 O 4 Catalyst for Efficient CO Oxidation
Author(s) -
Gao Zhongnan,
Zhao Dongyue,
Cheng Qingpeng,
Zhao Dejian,
Yang Yuexi,
Tian Ye,
Ding Tong,
Song Song,
Guo Lihong,
Li Xingang
Publication year - 2021
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202100602
Subject(s) - catalysis , mesoporous material , chemical engineering , cobalt , mesoporous silica , materials science , oxygen storage , thermal stability , heterogeneous catalysis , oxygen , nanoparticle , desorption , inert gas , chemistry , inorganic chemistry , nanotechnology , adsorption , organic chemistry , engineering
To meet the increasing demand for efficient and durable catalysts for exhaust aftertreatment system, a mesoporous SiO 2 ‐encapsulated nano‐Co 3 O 4 catalyst was synthesized, which possesses a unique pitaya‐like structure with high CO oxidation activity and thermal stability. Though the silica matrix is inert, the encapsulated Co 3 O 4 exhibits increased oxygen storage capacity, enhanced CO 2 desorption behavior and high lattice oxygen reactivity. Additionally, the SiO 2 ‐encapsulated Co 3 O 4 catalyst can be effectively regenerated rather than the supported Co 3 O 4 /SiO 2 and pure Co 3 O 4 . The kinetic results demonstrate that the L−H mechanism is followed over the pure Co 3 O 4 nanoparticles catalyst, while the CO oxidation over the silica‐supported Co 3 O 4 catalysts obey to both L−H and MVK mechanism. The encapsulation structure of the as‐prepared catalyst can effectively restrain the aggregation of Co 3 O 4 during high temperature operations and improves the utilization efficiency of cobalt resources, as well, which would be suitable for practical applications.