Influence of calcination temperature on the structure and catalytic performance of CuOx-CoOy-CeO2 ternary mixed oxide for CO oxidation

Authors:  Zhi-Gang Liu, Song-Hai Chai, Andrew Binder, Yuan-Yuan Li, Lin-Tao Ji, Sheng Dai

Abstract:
Influence of calcination temperature (400−800^◦C) on the structure and catalytic activity of CuO_x-CoO_yCeO₂ ternary mixed oxide (atomic Cu:Co:Ce ratio of 1:5:5) prepared by co-precipitation method is investigated by N2 physisorption, XRD, TPR, TEM, TG-DTA, XPS, and CO oxidation reaction. The assynthesized CuO_x-CoO_y-CeO₂ undergoes successive structural changes with the calcination temperature, involving the hydroxide dehydration below 400^◦C, enhanced interaction between Co₃O₄ and CeO₂ at ca. 600 ^◦C, and Co₃O₄ decomposition to CoO at 700 ^◦C. The catalyst calcined at 600 ^◦C shows a relative enrichment of Cu⁺ on the surface of CuO_x-CoO_y-CeO₂ and an enhanced interaction between Co₃O₄ and CeO₂ along with the appearance of oxygen vacancies in CeO₂, which seems to be responsible for its highest catalytic activity for CO oxidation among all the tested catalysts. The complete conversion of CO is obtained at 70 ^◦C and about 50% of CO conversion is reached at 55 ^◦C

Keywords:
Calcination temperature
CuO-Co₃O₄-CeO₂
Mechanism
Mutual interaction, CO oxidation

Published in: Applied catalysis A: General  (Volume 451, Pages 1-288, 31 January 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Influence of calcination temperature on the structure and catalytic performance of CuOx-CoOy-CeO2 ternary mixed oxide for CO oxidation

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