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Kinetic and activity study of CO oxidation over CuO–MnOx–CeO2 catalysts

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Abstract

Three CuO–MnOx–CeO2 catalysts with different impregnation sequences (i.e. MnOx/CuO/CeO2, CuO/MnOx/CeO2 and CuO–MnOx/CeO2) were prepared and the effects of impregnation sequences on the structures and catalytic behaviors of these catalysts were investigated. It was found that the MnOx/CuO/CeO2 possessed the largest amount of oxygen vacancies but the lowest reducibility; the CuO/MnOx/CeO2 had the largest Cu+ contents but the lowest amount of oxygen vacancies; the CuO–MnOx/CeO2 catalyst had the highest CuO dispersion and the best reducibility, along with moderate amount of oxygen vacancies and Cu+ contents on the surface. The kinetic studies revealed that the apparent activation energies of CO oxidation over the CuO–MnOx/CeO2, MnOx/CuO/CeO2 and CuO/MnOx/CeO2 were 49.5, 51.8 and 73.8 kJ mol−1, in order, and the activities followed an order of CuO–MnOx/CeO2 > MnOx/CuO/CeO2 > CuO/MnOx/CeO2. The highest performance of the CuO–MnOx/CeO2 was ascribed to the highly dispersed CuO species and the mobility of lattice oxygen.

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Acknowledgments

This work is financially supported by Public Welfare Project of Zhejiang Province (Grant No. 2013C37086), Open Research Fund of Top Key Discipline of Chemistry in Zhejiang Provincial Colleges and Key Laboratory of the Ministry of Education for Advanced Catalysis Materials (Zhejiang Normal University, Grant No. ZJHX201414) and National Science Foundation of China (Grant No. 21173195).

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Authors and Affiliations

  1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China

    Ai-Ping Jia, Yun Deng, Geng-Shen Hu, Meng-Fei Luo & Ji-Qing Lu

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  1. Ai-Ping Jia
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  2. Yun Deng
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  3. Geng-Shen Hu
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Correspondence to Ji-Qing Lu.

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Jia, AP., Deng, Y., Hu, GS. et al. Kinetic and activity study of CO oxidation over CuO–MnOx–CeO2 catalysts. Reac Kinet Mech Cat 117, 503–520 (2016). https://doi.org/10.1007/s11144-015-0947-8

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  • DOI: https://doi.org/10.1007/s11144-015-0947-8

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