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Effect of Tungsten on Hg0 Removal by W–Mn–Mo/CNT During Oxy-Fuel Combustion Simulated Flue Gas

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posted on 2023-08-30, 13:34 authored by Yiming Wang, Bo Zhao, Weiwei Shan, Linbo Qin, Xi Sun, Qiang Zhang, Wangsheng Chen, Xiaowei Liu, Jun Han
A new type of tungsten-doped Mn–Mo/CNT catalyst (CM5Mo5Wx) is prepared by the impregnation method, and their surface properties and mercury removal ability during oxy-fuel combustion simulated flue gas are investigated in this study. It indicated that the addition of tungsten to Mn–Mo/CNT significantly changed the surface structure of the catalyst. The Brunauer–Emmett–Teller surface areas of CM5Mo5 and CM5Mo5W6 are 209 and 172 m2/g, respectively. However, the addition of tungsten expands pore volume of the catalyst. In addition, less Mn4+ is found on the surface of the tungsten-doped catalyst. Mercury removal ability of the tungsten-doped catalyst is stronger than that of CM5Mo5, especially the mercury removal ability of CM5Mo5W6. Its mercury removal efficiency is 98% at 100 °C, while that of CM5Mo5 is lower than 70%. Under different flue gas conditions, O2 and NO can significantly enhance Hg0 removal, but SO2 decreases mercury removal efficiency. However, H2O slightly suppresses the mercury removal by this catalyst. Moreover, combining the Hg-TPD and kinetic analyses, it was revealed that chemisorption is crucial for Hg0 removal. Hg0 is more easily adsorbed by CM5Mo5W6 through the results of kinetic analysis.

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