Surface tuning of LaCoO3 perovskite by acid etching to enhance its catalytic performance
来源期刊：Rare Metals2021年第3期
论文作者：Lu Dai Xin-Bo Lu Guo-Hai Chu Guo-Hai Chu Wang-Cheng Zhan Guo-Jun Zhou
文章页码：555 - 562
摘 要：The stoichiometric LaCoO3 and nonstoichiometric LaCo1.2O3 perovskite catalysts were prepared by citric acid sol-gel method,and then,LaCoO3 perovskite was etched with nitric acid.The structure,surface composition and reducibility of the catalyst were studied by X-ray diffraction（XRD）,nitrogen desorption,transmission electron microscope（TEM）,temperature program reduction of H2（H2-TPR） and X-ray photoelectron spectroscopy（XPS）.It was found that nitric acid etching did not change the crystal structure and the overall morphology of the LaCoO3 catalyst,but it can cause the exposure of B-site Co metal to the surface of the catalyst.As a result,after acid etching,the reducibility of the LaCoO3 catalyst was improved,leading to the improvement in the catalytic activity of the LaCoO3 catalyst for CO oxidation and C3 H8 combustion.Moreover,the catalytic activity of the LaCoO3 catalyst after acid etching was higher than that of LaCo1.2O3 and CoOx/LaCoO3 catalyst.
Lu Dai1，Xin-Bo Lu1，Guo-Hai Chu1，Cheng-Huan He2，Wang-Cheng Zhan2，Guo-Jun Zhou1
1. China Tobacco Zhejiang Industrial Co.,Ltd2. Research Institute Catalysis,School of Chemistry and Molecular Engineering,East China University of Science and Technology
摘 要：The stoichiometric LaCoO3 and nonstoichiometric LaCo1.2O3 perovskite catalysts were prepared by citric acid sol-gel method,and then,LaCoO3 perovskite was etched with nitric acid.The structure,surface composition and reducibility of the catalyst were studied by X-ray diffraction（XRD）,nitrogen desorption,transmission electron microscope（TEM）,temperature program reduction of H2（H2-TPR） and X-ray photoelectron spectroscopy（XPS）.It was found that nitric acid etching did not change the crystal structure and the overall morphology of the LaCoO3 catalyst,but it can cause the exposure of B-site Co metal to the surface of the catalyst.As a result,after acid etching,the reducibility of the LaCoO3 catalyst was improved,leading to the improvement in the catalytic activity of the LaCoO3 catalyst for CO oxidation and C3 H8 combustion.Moreover,the catalytic activity of the LaCoO3 catalyst after acid etching was higher than that of LaCo1.2O3 and CoOx/LaCoO3 catalyst.
关键词：
