Mn-Mo-W-O_x脱硝催化剂活性组分的配伍优化  

Compatibility Optimization of Mn-Mo-W-O_x Catalyst for Selective Catalytic Reduction of NO by NH_3

作　　者：金奇杰[1,2] 眭国荣[1] 刘青[1] 沈岳松[1,2] 李慧远[1,3] 祝社民[1,2] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]南京工业大学江苏先进无机功能复合材料协同创新中心,江苏南京210009 [3]山东天璨环保科技有限公司,山东淄博255086

出　　处：《分子催化》2017年第2期159-168,共10页Journal of Molecular Catalysis(China)

基　　金：国家重点研发计划(2016YFC0205500);国家自然科学基金(51272105);江苏省社会发展科技支撑计划(BE2013718);江苏省高校优势学科建设工程资助项目(PAPD)~~

摘　　要：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-Ox/cordierite and Mn-Mo-W-Ox/TiO2 catalysts were prepared by volumetric im- pregnation method and tested for selective catalytic reduction of NO by NH3. Mn-Mo-W-Ox compatibility was de- signed to obtain the optimum proportion. These catalysts were characterized by XRD, N2-BET, Py-IR, SEM and XPS to analyze the phase structure, specific surface area, acid content and the catalyst surface element. Results showed that the catalyst with the Mn/Mo/W molar ratio of 10 ： 0.5 ： 1, supported on TiO2 , exhibited the best ca- talytic activity for NH3-SCR. The appropriate addition of Mo could enlarge the specific surface area, increase the amount of Lewis acid sites and the concentration of Mn4＋ , which was beneficial for the catalytic activity at the high temperatures. In addition, TiO： as the catalyst carrier could increase the specific surface area and the amount of acid sites, so that the catalytic performance would be enhanced.

关 键 词：Mn-Mo-W-Ox 配方优化 选择性催化还原 NO 

分 类 号：X701.3[环境科学与工程—环境工程] O643.3[理学—物理化学]