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Citation: Hailong Zhang, Jianli Wang, Yi Cao, Yijing Wang, Maochu Gong, Yaoqiang Chen. Effect of Y on improving the thermal stability of MnO_x-CeO₂ catalysts for diesel soot oxidation[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1333-1341. doi: 10.1016/S1872-2067(15)60867-1 shu

Effect of Y on improving the thermal stability of MnO_x-CeO₂ catalysts for diesel soot oxidation

1.
a Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China;

Corresponding author: Yaoqiang Chen,
Received Date: 26 February 2015
Available Online: 14 April 2015
Fund Project: 国家高技术研究发展计划(863计划, 2013AA065304) (863计划, 2013AA065304) 绿色催化四川省高校重点实验室开放课题(2013LF3004). (2013LF3004)

A series of MnO_x-CeO₂-Y₂O₃ catalysts with different Y loadings (0, 1, 3, 6, and 10 wt%) were prepared by a co-precipitation method and investigated for NO_x-assisted soot oxidation. The thermal stabilities of these catalysts were evaluated by treating them at 800 ℃ for 12 h under dry air flow. The catalysts were characterized by X-ray diffraction, N₂ adsorption-desorption, Raman spectroscopy, H₂ temperature-programmed reduction, oxygen storage capacity, NO temperature- programmed oxidation, X-ray photoelectron spectroscopy, and soot temperature-programmed oxidation. The addition of Y led to decreased BET surface areas and poor low-temperature reduction abilities and oxygen storage capacities, which affected NO and soot oxidation activities. However, after aging, the doping of Y had effectively enhanced the stability of the catalytic activities for NO and soot oxidations, where the addition of 6%-10% Y achieved the optimum result because the maximal soot oxidation rate temperature was increased by only 34-35 ℃. Additionally, the catalytic activity and deactivation of MnO_x-CeO₂-containing catalysts were closely related to the presence of Mn⁴⁺ and oxygen species on the surface.
- MnO_x-CeO₂-Y₂O₃,
- Soot oxidation activity,
- Thermal stability,
- Redox property,
- Oxygen storage capacity
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Effect of Y on improving the thermal stability of MnOx-CeO2 catalysts for diesel soot oxidation

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通讯作者: 陈斌, bchen63@163.com

Effect of Y on improving the thermal stability of MnO_x-CeO₂ catalysts for diesel soot oxidation