Active oxygen-assisted NO-NO2 recycling and decomposition of surface oxygenated species on diesel soot with Pt/Ce0.6Zr0.4O2 catalyst

doi:10.1016/S1872-2067(14)60004-8

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (3): 407-415.DOI: 10.1016/S1872-2067(14)60004-8

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Active oxygen-assisted NO-NO₂ recycling and decomposition of surface oxygenated species on diesel soot with Pt/Ce_0.6Zr_0.4O₂ catalyst

Shuang Liu, Xiaodong Wu, Yu Lin, Min Li, Duan Weng

Key Laboratory of Advanced Materials of MOE, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received:2013-11-09 Revised:2013-12-13 Online:2014-02-26 Published:2014-02-26
Supported by:
This work was supported by the National Natural Science Foundation of China (51072096), the National Basic Research Program of China (973 Program, 2010CB732304), and the National High Technology Research and Development Program of China (863 Program, 2013AA065302).

Abstract

Abstract:

A Pt/Ce_0.6Zr_0.4O₂ catalyst was synthesized by impregnating a Ce_0.6Zr_0.4O₂ support with Pt(NO₃)₂ solution. This material exhibits higher catalytic activity than Pt/Al₂O₃ for soot oxidation under loose contact conditions in both NO + O₂ and O₂ atmospheres. The results show that the pronounced activity of this catalyst is attributed to a synergistic effect arising from the combination of Pt and Ce_0.6Zr_0.4O₂ solid solution, leading to a remarkable increase in the availability of active oxygen at temperatures as low as 450 ℃. The NO↔NO₂ recycling efficiency is improved over Pt/Ce_0.6Zr_0.4O₂ catalyst, enhancing the ability of the NO₂-soot reaction to generate surface oxygenated complexes (SOCs) on the soot. More importantly, the catalytic oxidation of these SOCs can be accelerated with the participation of active oxygen from the CeO₂-ZrO₂ solid solution. As a result, during soot oxidation under NO + O₂, the light-off temperature of the Pt/Ce_0.6Zr_0.4O₂ catalyst is lowered by 34 ℃ than that of Pt/Al₂O₃ catalyst.

Key words: Platiumn-based catalyst, Ceria-zirconia mixed oxide, Soot oxidation, Nitrogen monoxide-nitrogen dioxide recycling, Surface oxygenated species

Shuang Liu, Xiaodong Wu, Yu Lin, Min Li, Duan Weng. Active oxygen-assisted NO-NO₂ recycling and decomposition of surface oxygenated species on diesel soot with Pt/Ce_0.6Zr_0.4O₂ catalyst[J]. Chinese Journal of Catalysis, 2014, 35(3): 407-415.

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Active oxygen-assisted NO-NO₂ recycling and decomposition of surface oxygenated species on diesel soot with Pt/Ce_0.6Zr_0.4O₂ catalyst

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