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Effect of Textural Structure on the Catalytic Performance of LaCoO 3 for CO Oxidation
Author(s) -
Xiao Ping,
Zhu Junjiang,
Li Hailong,
Jiang Wen,
Wang Tao,
Zhu Yujun,
Zhao Yanxi,
Li Jinlin
Publication year - 2014
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.201402064
Subject(s) - catalysis , physisorption , x ray photoelectron spectroscopy , oxidizing agent , oxygen , desorption , perovskite (structure) , redox , temperature programmed reduction , materials science , inorganic chemistry , catalytic oxidation , thermal desorption spectroscopy , chemistry , hydrogen , activation energy , chemical engineering , adsorption , crystallography , biochemistry , organic chemistry , engineering
Abstract Bulk, supported, and porous perovskite LaCoO 3 were prepared and their catalytic performances for CO oxidation were investigated. XRD, FTIR spectroscopy, SEM, TEM, and N 2 physisorption measurements were performed to identify their structure, and temperature‐programmed desorption of oxygen, temperature‐programmed reduction by hydrogen, and X‐ray photoelectron spectroscopy were conducted to study their physicochemical properties. With the change from bulk to nanoparticles and further to a porous structure, the series of LaCoO 3 samples showed increased oxygen vacancies and improved oxidizing ability, which led to enhanced catalytic performances for CO oxidation. The correlation of the CO oxidation activity with the amount of exposed metal sites indicated that the Co ions should be the active site of the reaction. Comparison of the activation energy supported the changes observed in the activities.