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Effect of Ni doping in NixMn1-xTi10 (x = 0.1-0.5) on activity and SO2 resistance for NH3-SCR of NO studied with in situ DRIFTS

Abstract

In this work, a series of NixMn1-xTi10 (x = 0.0-0.5) catalysts were synthesized using one pot sol-gel method for selective catalytic reduction (SCR) of NO with NH3. The effects of Ni doping on the catalytic activity and SO2 resistance were investigated by XRD, TEM-EDS, XPS, NH3-TPD, H2-TPR, SO2-TPD and In situ DRIFTS. It is found that the more amounts of surface Mn4+ and Oα species exit on the catalyst surface, the higher oxidation ability for NO and NH3 presents, which results in the better activity at low temperature and the worse selectivity to N2 at high temperature due to the overoxidation of NH3. Among NixMn1-xTi10 (x = 0.0-0.5), the Ni0.4Mn0.6Ti10 catalyst exhibited excellent NH3-SCR activity, wide temperature window (190-360 oC) and good H2O and SO2 durability even in presence of 100 ppm SO2 and 15% H2O under a GHSV of 40,000 h-1, which is very competitive for the practical application in controlling the NOx emission from stationary resources. It is concluded that more surface Lewis acid sites, the appropriate contents of surface active Mn4+ and surface oxygen species on the surface of Ni0.4Mn0.6Ti10 play key roles in the especial SCR performance due to the interactions among Mn, Ni and Ti oxides. The SO2-TPD and in situ DRIFTS results confirm the reason of good SO2 resistance for the Ni0.4Mn0.6Ti10 catalyst. Moreover, in situ DRIFTS results reveal the NH3-SCR reaction over Ni0.4Mn0.6Ti10 mainly follows the Eley-Rideal (E-R) type mechanism.

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Publication details

The article was received on 06 Apr 2017, accepted on 14 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7CY00672A
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Effect of Ni doping in NixMn1-xTi10 (x = 0.1-0.5) on activity and SO2 resistance for NH3-SCR of NO studied with in situ DRIFTS

    L. Chen, R. Li, Z. Li, F. Yuan, X. Niu and Y. Zhu, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY00672A

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