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

doi:10.1016/S1872-2067(15)60867-1

Abstract

Abstract:

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.

Key words: MnO_x-CeO₂-Y₂O₃, Soot oxidation activity, Thermal stability, Redox property, Oxygen storage capacity

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)60867-1

https://www.cjcatal.com/EN/Y2015/V36/I8/1333

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

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