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Surface tuning of LaCoO3 perovskite by acid etching to enhance its catalytic performance

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Abstract

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 C3H8 combustion. Moreover, the catalytic activity of the LaCoO3 catalyst after acid etching was higher than that of LaCo1.2O3 and CoOx/LaCoO3 catalyst.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2016YFC0204300) and China National Tobacco Corporation Major Projects (No. 110201501001).

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Authors and Affiliations

  1. China Tobacco Zhejiang Industrial Co., Ltd, Hangzhou, 310024, China

    Lu Dai, Xin-Bo Lu, Guo-Hai Chu & Guo-Jun Zhou

  2. Research Institute Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China

    Cheng-Huan He & Wang-Cheng Zhan

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  1. Lu Dai
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Correspondence to Guo-Jun Zhou.

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Dai, L., Lu, XB., Chu, GH. et al. Surface tuning of LaCoO3 perovskite by acid etching to enhance its catalytic performance. Rare Met. 40, 555–562 (2021). https://doi.org/10.1007/s12598-019-01360-w

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