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Mechanistic Origin of Enhanced CO Catalytic Oxidation over Co 3 O 4 /LaCoO 3 at Lower Temperature
Author(s) -
Liu Shujie,
Zhang Wei,
Deng Ting,
Wang Dong,
Wang Xiyang,
Zhang Xinxin,
Zhang Cai,
Zheng Weitao
Publication year - 2017
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.201700937
Subject(s) - xanes , x ray photoelectron spectroscopy , catalysis , stoichiometry , materials science , annealing (glass) , nanoparticle , oxide , perovskite (structure) , oxygen , inorganic chemistry , chemical engineering , chemistry , spectroscopy , crystallography , nanotechnology , organic chemistry , biochemistry , physics , quantum mechanics , engineering , metallurgy , composite material
Abstract CO catalytic oxidation on the perovskite oxide LaCoO 3 , which can be ascribed to a decoration of Co 3 O 4 nanoparticles on the surface, was achieved with 90 % conversion rate at 202 °C. The obtained dual‐phase catalyst was successfully synthesized through a non‐stoichiometric Ce‐induced exsolution‐like process, after an electrospinning treatment with subsequent annealing. The enhanced activity originates from the surface oxygen of LaCoO 3 /Co 3 O 4 and Co 3+ in the Co 3 O 4 nanoparticles, as confirmed by X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption near‐edge structure analysis (XANES). The synergic effect of the surfaced Co 3 O 4 and parent LaCoO 3 may open a path to unlocking the activity of perovskite oxides for enhanced low‐temperature CO oxidation.