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Sol‐Gel Preparation of Perovskite Oxides Using Ethylene Glycol and Alcohol Mixture as Complexant and Its Catalytic Performances for CO Oxidation
Author(s) -
Wang Shan,
Zhang Yibo,
Zhu Junjiang,
Tang Duihai,
Zhao Zhen,
Yang Xiangguang
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802848
Subject(s) - perovskite (structure) , ethylene glycol , citric acid , catalysis , inorganic chemistry , sol gel , materials science , alcohol , phase (matter) , chemistry , organic chemistry , nanotechnology
We reported an updated sol‐gel method for the preparation of perovskite oxide using ethylene glycol and alcohol mixture as complexant. Relative to that prepared by sol‐gel method using citric acid as complexant, the sample prepared by this updated method showed porous structure, higher surface area, more oxygen vacancies and stronger reducibility, due to a two‐step combustion process. By comparing the phase transformation temperature of perovskite oxides using different transition metals, it was inferred that the electron distribution in the 3 d orbit is a crucial factor influencing the formation of perovskite structure. The easier the electrons to be excited, the easier the perovskite structure to be formed. Catalytic results showed that the sample (e. g., LaCoO 3 ‐EM) prepared by the updated method is more active for CO oxidation than that prepared by citric acid method, with full CO conversion obtained at 135 °C and no activity loss is observable either by long‐term (30 h) or by cycling (3 times) stability tests. Effect of the chain length of alcohols on the properties of LaCoO 3 was also studied.