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采用等体积浸渍法制备系列Mn-Mo-W-O_x/堇青石和Mn-Mo-W-O_x/TiO_2催化剂,用于选择性催化还原NO.通过Mn、Mo、W 3种元素不同配比对催化剂配伍进行优化,确立Mn-Mo-W-O_x最佳配比.采用XRD、N_2-BET、PyIR、SEM以及XPS等表征分析催化剂的固相结构、比表面积、酸量、表面形貌和表面元素.结果表明:当Mn/Mo/W元素摩尔比为10∶0.5∶1,载体为TiO_2时,催化剂的催化性能最优.适量Mo掺入Mn-W-O_x催化剂可以增大其比表面积,提高催化剂表面L酸酸量以及Mn~(4+)离子浓度,从而有效提高了催化剂高温活性.载体替换为TiO_2时催化剂的比表面积和酸量明显提高,从而增强了催化剂的脱硝性能.
A series of Mn-Mo-W-O_x / cordierite and Mn-Mo-W_O_x / TiO_2 catalysts were prepared by the same volume impregnation method for the selective catalytic reduction of NO. By Mn, Mo, The optimal ratio of Mn-Mo-W-O_x was determined.The solid phase structure, specific surface area, acid content, surface morphology and surface of the catalyst were characterized by XRD, N_2-BET, PyIR, SEM and XPS. Element.The results showed that when the molar ratio of Mn / Mo / W was 10: 0.5: 1 and the carrier was TiO 2, the catalytic activity of the catalyst was the best.Adding an appropriate amount of Mo into Mn-W-O_x catalyst can increase its specific surface area, The amount of L acid and the concentration of Mn 4+ ions on the surface of the catalyst were increased, and the high temperature activity of the catalyst was effectively enhanced. The specific surface area and acid amount of the catalyst were obviously increased when the catalyst was replaced by TiO 2.