Effect of Preparation Methods on Performance of Mn-Ce/ZSM-5 Catalyst for Low-temperature Selective Catalytic Reduction of NO

doi:10.7503/cjcu20120079

Abstract

Abstract:

Mn-Ce/ZSM-5 catalysts for selective catalytic reduction(SCR) of nitric oxide with NH₃ were prepared by co-impregnation(CI), co-precipitation(CP) and physical mixture(PM) methods. The Mn-Ce/ZSM-5 catalyst prepared by co-precipitation method exhibited excellent SCR performance, it had not only good SCR activity and broad temperature window, but also high thermal stability. The effect of Ce content on SCR activity of Mn-Ce/ZSM-5 catalyst was obvious. The structure and phase of the Mn-Ce/ZSM-5 catalysts prepared by different methods were investigated. The results show that Ce exist mainly in Ce⁴⁺ in Mn-Ce/ZSM-5 catalyst, and CeO₂ may strongly interact with MnO_x. Many kinds of Mn phases exist in Mn-Ce/ZSM-5 catalyst. The sample prepared by co-precipitation method possesses more MnO_x phases of lower bond valence such as Mn₂O₃ and Mn₃O₄. It can make oxygen species(O_1s) easily enriched on the surface of the Mn-Ce/ZSM-5 catalyst. These factors may lead to the best catalytic activity of the Mn-Ce/ZSM-5 prepared by co-precipitation.

Key words: Mn-Ce/ZSM-5, Low-temperature catalyst, NO_x, Selective catalytic reduction

CLC Number:

O643

TrendMD:

HE Li-Fang, LIU Jian-Dong, HUANG Wei, LI Zhe. Effect of Preparation Methods on Performance of Mn-Ce/ZSM-5 Catalyst for Low-temperature Selective Catalytic Reduction of NO[J]. Chem. J. Chinese Universities, 2012, 33(11): 2532.

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Effect of Preparation Methods on Performance of Mn-Ce/ZSM-5 Catalyst for Low-temperature Selective Catalytic Reduction of NO

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