Citation:
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.
doi:
10.1016/S1872-2067(14)60088-7
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CeO2, Co3O4, and a series of Co3O4/CeO2 composite 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/CeO2 composite 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/CeO2 composite oxides showed better SO2 tolerance and higher activity than CeO2 but were more easily poisoned by SO2 than Co3O4.
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Keywords:
- Soot oxidation,
- Cobalt oxide,
- Ceria,
- Composite oxide,
- Sulfur poisoning
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