Citation: Wenjin Xu, Guangxu Zhang, Hanwei Chen, Guomeng Zhang, Yang Han, Yichuan Chang, Peng Gong. Mn/beta and Mn/ZSM-5 for the low-temperature selective catalytic reduction of NO with ammonia: Effect of manganese precursors[J]. Chinese Journal of Catalysis, ;2018, 39(1): 118-127. doi: 10.1016/S1872-2067(17)62983-8 shu

Mn/beta and Mn/ZSM-5 for the low-temperature selective catalytic reduction of NO with ammonia: Effect of manganese precursors

a School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, Hubei, China;
b Shanghai Hengyuan Marine Equipment Co., Ltd., Shanghai 201709, China

Received Date: 15 August 2017
Revised Date: 22 November 2017

Fund Project: This work was supported by the National Science and Technology Program of China (CDGC01-KT16).

Two series of Mn/beta and Mn/ZSM-5 catalysts were prepared to study the influence of how different Mn precursors, introduced to the respective parent zeolites by wet impregnation, affected the selective catalytic reduction (SCR) of NO by NH₃ across a low reaction temperature window of 50-350℃. In this study, the catalysts were characterized using N₂ adsorption/desorption, X-ray diffraction, X-ray fluorescence, H₂ temperature-programmed reduction, NH₃ temperature-programmed desorption and X-ray photoelectron spectroscopy. As the manganese chloride precursor only partially decomposed this primarily resulted in the formation of MnCl₂ in addition to the presence of low levels of crystalline Mn₃O₄, which resulted in poor catalytic performance. However, the manganese nitrate precursor formed crystalline MnO₂ as the major phase in addition to a minor presence of unconverted Mn-nitrate. Furthermore, manganese acetate resulted principally in a mixture of amorphous Mn₂O₃ and MnO₂, and crystalline Mn₃O₄. From all the catalysts screened, the test performance data showed Mn/beta-Ac to exhibit the highest NO conversion (97.5%) at 240℃, which remained >90% across a temperature window of 220-350℃. The excellent catalytic performance was ascribed to the enrichment of highly dispersed MnO_x (Mn₂O₃ and MnO₂) species that act as the active phase in the NH₃-SCR process. Furthermore, together with a suitable amount of weakly acidic centers, higher concentration of surface manganese and a greater presence of surface labile oxygen groups, SCR performance was collectively enhanced at low temperature.
- Mn/beta,
- Mn/ZSM-5,
- Low-temperature,
- Catalytic performance,
- Selective catalytic reduction,
- Manganese precursors
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