In situ studies on ceria promoted cobalt oxide for CO oxidation

doi:10.1016/S1872-2067(19)63282-1

Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (5): 656-663.DOI: 10.1016/S1872-2067(19)63282-1

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In situ studies on ceria promoted cobalt oxide for CO oxidation

Weiwei Huan^a,c, Jie Li^a,b, Jiahui Ji^c, Mingyang Xing^c

a Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an 311300, Zhejiang, China;
b Zhejiang provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Hangzhou 310023, Zhejiang, China;
c Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2018-11-11 Revised:2018-12-20 Online:2019-05-18 Published:2019-03-30
Contact: S1872-2067(19)63282-1
Supported by:
This work was supported by the State Key Research Development Program of China (2016YFA0204200), the National Natural Science Foundation of China (21822603, 21577036, 21773062), the Shanghai Pujiang Program (17PJD011), the Zhejiang public welfare technology research plan/rural agriculture (LGN18B010001), the Zhejiang provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing (NO:2016KF0005),and the scientific research project of Zhejiang provincial education department (Y201839892).

Abstract

Abstract:

In situ studies of catalysts play valuable roles in observing phase transformation, understanding the corresponding surface chemistry and the mechanism of the reaction. In this paper, ceria promoted cobalt oxide was prepared by the calcination method and investigated for the CO oxidation. The microstructure and morphology of CeO₂-Co₃O₄ were investigated by the Scanning Electron Microscope, High-resolution transmission electron microscopy, Raman and X-ray photoelectron spectroscopy characterization. The effect of CeO₂ doping on Co₃O₄ for CO oxidation was characterized by in situ X-ray Diffraction (in situ XRD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). In situ XRD was carried out under H₂ atmosphere to evaluate the redox property of catalysts. The results indicated that the ceria doping can enhance the reducibility of Co²⁺ and promote the Co³⁺-Co²⁺-Co³⁺ cycle, owing to the oxygen replenish property of CeO₂. Furthermore, adsorbed carbonate species on the surface of CeO₂-Co₃O₄ were investigated by in situ-DRIFTS experiment. It was turned out that carbonate species on ceria promoted cobalt oxide catalysts showed different IR peaks compared with pure cobalt oxide. The carbonate species on ceria promoted catalyst are more active, and similar to free state carbonate species with weak bonding to catalyst surface, which can effectively inhibit catalyst inactivation. This study revealed the mechanism of ceria promoting CO oxidation over cobalt oxide, which will provide theoretical support for the design of efficient CO oxidation catalysts.

Key words: CeO₂-Co₃O₄ CO oxidation, In situ X-ray diffraction, In situ diffuse reflectance infrared, Fourier transform spectroscopy, Carbonate species

Weiwei Huan, Jie Li, Jiahui Ji, Mingyang Xing. In situ studies on ceria promoted cobalt oxide for CO oxidation[J]. Chinese Journal of Catalysis, 2019, 40(5): 656-663.

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In situ studies on ceria promoted cobalt oxide for CO oxidation

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