Journal
APPLIED SURFACE SCIENCE
Volume 515, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146014
Keywords
In situ DRIFTS; NH3-SCR; Resistance of H2O and SO2; Surface acidity; Mn/TiO2
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Funding
- National Nature Science Foundation of China [21763003, 21663006]
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The loading of Mn on TiO2 for NH3-SCR has good low temperature catalytic activity and has been extensively studied. In this experiment, a series of second metals (Ce, Fe, Co, Ni) were added to modify the Mn/TiO2 mixed oxide. The experimental results show that Ni-Mn/TiO2 has excellent catalytic activity, but the addition of Co element did not increase the catalytic activity. The excellent catalytic activity of Ni-Mn/TiO2 is mainly due to its the strong interaction, which enhances the reducibility, increases the total acid amount, Ti3+ ratio, Mn4+ ratio, and the proportion of adsorbed oxygen. These factors facilitate the adsorption and activation of reactant molecules. In addition, in situ DRIFTS results indicate that both the B acid site and the L acid site function at 200 degrees C, bidentate nitrate not participate in the catalytic reaction and the Langmuir-Hinshelwood (L-H) mechanism dominates at 200 degrees C.
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