Influence of Mn/(Mn+Ce) Ratio of MnOx-CeO2/WO3-ZrO2 Monolith Catalyst on Selective Catalytic Reduction of NOx with Ammonia

doi:10.1016/S1872-2067(11)60467-1

Abstract

Abstract: A series of monolith MnO_x-CeO₂/WO₃-ZrO₂ catalysts with different mass ratios of Mn/(Mn+Ce) were prepared and used for the selective catalytic reduction (SCR) of NO_x with NH₃ in the presence of excess O₂. The catalysts were characterized by N₂ adsorption, oxygen storage capacity, X-ray diffraction, X-ray photoelectron spectroscopy, NH₃/NO temperature-programmed desorption, and H₂temperature-programmed reduction. The best catalyst had the mass ratio of Mn/(Mn+Ce) = 0.5. It gave 90% NO_x conversion in the range of 173-355 ºC at the gas hourly space velocity of 10000 h^-1, and characterization results showed that a higher oxidation activity of NO to NO₂, more surface Ce and Mn with a larger Ce³⁺/Ce⁴⁺ ratio, lower NH₃ and NO desorption temperatures, and excellent redox ability were together responsible for its best NH₃-SCR performance.

Key words: manganese, cerium, selective catalytic reduction of ammonia, nitrogen oxide, mass ratio

XU Hai-Di, FANG Zhi-Tao, CAO Yi, KONG Shuang, LIN Tao, GONG Mao-Chu, CHEN Yao-Qiang. Influence of Mn/(Mn+Ce) Ratio of MnO_x-CeO₂/WO₃-ZrO₂ Monolith Catalyst on Selective Catalytic Reduction of NO_x with Ammonia[J]. Chinese Journal of Catalysis, 2012, 33(12): 1927-1937.

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Influence of Mn/(Mn+Ce) Ratio of MnO_x-CeO₂/WO₃-ZrO₂ Monolith Catalyst on Selective Catalytic Reduction of NO_x with Ammonia

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