Soot combustion performance and H2-TPR studyonceria-basedmixed oxides

doi:10.1016/S1872-2067(11)60495-6

Abstract

Abstract:

Ceria (CeO₂) catalysts doped with different metal ions were prepared by sol-gel or impregnation methods, and their catalytic activityfor soot combustion was evaluated by thermogravimetry. Temperature-programmed reduction was used to investigate the influence of their redox properties on soot combustion performance. The results indicate that the oxidation temperature of soot can be significantly reduced using catalysts containing transition metals, which provide increased surface and lattice oxygen compared with undoped CeO₂. The ability of each catalyst to deliver active oxygen at low temperature (200-400℃) plays an important role in determining catalytic performance. However, incorporation of structure promoter, alkali metals, and alkaline earth metals increase the delivery of active oxygen only at moderate temperature (above 400℃), which accelerate the combustion rate of soot.

Key words: Soot, Ceria-based mixed oxide, Catalytic combustion, Redox property

SHENG Yeqin, ZHOU Ying, LU Hanfeng, ZHANG Zekai, CHEN Yinfei. Soot combustion performance and H₂-TPR studyonceria-basedmixed oxides[J]. Chinese Journal of Catalysis, 2013, 34(3): 567-577.

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https://www.cjcatal.com/EN/Y2013/V34/I3/567

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Soot combustion performance and H₂-TPR studyonceria-basedmixed oxides

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