Effect of sulfur poisoning on Co3O4/CeO2 composite oxide catalyst for soot combustion

doi:10.1016/S1872-2067(14)60088-7

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (9): 1504-1510.DOI: 10.1016/S1872-2067(14)60088-7

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Effect of sulfur poisoning on Co₃O₄/CeO₂ composite oxide catalyst for soot combustion

Xiaoyan Shi^a, Yunbo Yu^a, Li Xue^b, Hong He^a

a Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
b School of Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, China

Received:2014-02-23 Revised:2014-03-21 Online:2014-08-19 Published:2014-08-22
Supported by:
This work was supported by the National Basic Research Program of China (973 Program, 2010CB732304) and the State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex (SCAPC201302).

Abstract

Abstract:

CeO₂, Co₃O₄, and a series of Co₃O₄/CeO₂composite oxides prepared by co-precipitation were exposed to SO₂ under an oxidizing environment at 400 ℃. These fresh and SO₂-poisoned samples were characterized by in situ diffuse reflectance infrared Fourier transform spectroscopy, X-ray diffraction, temperature-programmed desorption, and X-ray photoelectron spectroscopy. Sulfates were formed on the oxides, with more sulfates on CeO₂ than on Co₃O₄. On the Co₃O₄/CeO₂composite oxides, both cobalt sulphate and ceria sulfate were formed. Fresh and sulfated samples were tested for soot combustion in a NO/O₂ gas flow. The Co₃O₄/CeO₂composite oxides showed better SO₂tolerance and higher activity than CeO₂ but were more easily poisoned by SO₂than Co₃O₄.

Key words: Soot oxidation, Cobalt oxide, Ceria, Composite oxide, Sulfur poisoning

Xiaoyan Shi, Yunbo Yu, Li Xue, Hong He. Effect of sulfur poisoning on Co₃O₄/CeO₂ composite oxide catalyst for soot combustion[J]. Chinese Journal of Catalysis, 2014, 35(9): 1504-1510.

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Effect of sulfur poisoning on Co₃O₄/CeO₂ composite oxide catalyst for soot combustion

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