Influence of the TiO2 crystalline phase of MnOx/TiO2 catalysts for NO oxidation

doi:10.1016/S1872-2067(12)60726-8

Abstract

Abstract:

Mn-based catalysts impregnated on TiO₂ with different crystalline phases (rutile (R), anatase (A), and P25 (P)) were studied for the oxidation of NO to NO₂. 10%MnO_x/TiO₂(P) was the most active catalyst, giving 83% of NO conversion at 300℃ and a GHSV of 20000 h^-1. The catalyst activities were in the order MnO_x/TiO₂(P) > MnO_x/TiO₂(A) > MnO_x/TiO₂(R). The catalysts were characterized by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and O₂ temperature-programmed desorption. Compared to anatase and rutile, P25 gave better dispersion of MnO_x on the support surface, suppressed the agglomeration of catalyst particles, and also produced more Mn₂O₃, which was more active for the oxidation of NO. In addition, P25 enhanced the reduction of MnO_x, especially for Mn₂O₃, and the formation of easily desorbed O₂^- generated from the Mn³⁺-O bond.

Key words: Nitrogen oxide oxidation, Manganese oxide, Titanium dioxide, Crystalline phase, Pollution control

Zhongyi An, Yuqun Zhuo, Chao Xu, Changhe Chen. Influence of the TiO₂ crystalline phase of MnO_x/TiO₂ catalysts for NO oxidation[J]. Chinese Journal of Catalysis, 2014, 35(1): 120-126.

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Influence of the TiO₂ crystalline phase of MnO_x/TiO₂ catalysts for NO oxidation

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