Mechanism of Selective Catalytic Reduction of NOx with NH3 over CeO2-WO3 Catalysts

doi:10.1016/S1872-2067(10)60195-7

Abstract

Abstract: The mechanism of NH₃-selective catalytic reduction (SCR) over a CeO₂-WO₃ catalyst was investigated by temperature-programmed desorption (TPD) analysis and in situ diffuse reflectance infrared Fourier transform spectroscopy. The active sites were on CeO₂, while WO₃ greatly enhanced the amount and strength of the surface Brönsted acid sites and the NO oxidation ability. Both NH₄⁺ and coordinated NH₃ contributed to the SCR reaction. Bridging nitrate and monodentate nitrate were confirmed as the reactive nitrate species. Under SCR reaction conditions, surface NH₄NO₃ was formed, which played the role of an important intermediate species. Two different pathways for the SCR reaction were suggested for the CeO₂-WO₃ catalyst.

Key words: nitrogen oxide removal, selective catalytic reduction, activity, nitrogen oxide oxidation ability, mechanism

CHEN Liang, LI Jun-Hua, GE Mao-Fa, MA Lei, CHANG Hua-Zhen-. Mechanism of Selective Catalytic Reduction of NO_x with NH₃ over CeO₂-WO₃ Catalysts[J]. Chinese Journal of Catalysis, 2011, 32(5): 836-841.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(10)60195-7

https://www.cjcatal.com/EN/Y2011/V32/I5/836

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Mechanism of Selective Catalytic Reduction of NO_x with NH₃ over CeO₂-WO₃ Catalysts

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