SnO2改性TiO2对V2O5-WO3/TiO2催化剂结构和SCR性能影响  

Effect of TiO_2 Modulation by SnO_2 on the Structure and SCR Performance of V_2O_5-WO_3/TiO_2 Catalysts

作　　者：陈梦寅 赵梦梦[1] 余海涛[1] 张鹏举[1] 唐富顺[1] 阮乐[1] 杨宏斌[1,2] 李凝[1] CHEN Meng-yin ZHAO Meng-meng YU Hai-tao ZHANG Peng-ju TANG Fu-shun RUAN Le YANG Hong-bin LI Ning(College of Chemistry and Bioengineering, Guilin University of Technology, Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, Guilin 541004, China Guangxi solid waste management center, Nanning 530028, China)

机构地区：[1]桂林理工大学化学与生物工程学院,广西电磁化学功能物质重点实验室,广西桂林541004 [2]广西壮族自治区固体废物管理中心,广西南宁530028

出　　处：《分子催化》2017年第1期61-73,共13页Journal of Molecular Catalysis(China)

基　　金：广西自然科学基金项目(No.2014GXNSFAA118057);广西科学研究与技术开发计划项目(No.1598007-39);桂林理工大学博士基金(No.002401003321)资助项目~~

摘　　要：采用共沉淀法将SnO_2组分掺入到V_2O_5-WO_3/TiO_2催化剂载体TiO_2中,并通过多种物理化学手段,考察了不同SnO_2掺入量时对催化剂结构,表面分散物种和SCR性能影响.结果表明,SnO_2掺入到TiO_2中,元素Sn与Ti以Sn—O—Ti键形式相互作用,促进锐钛矿型TiO_2向金红石型TiO_2转变.在特定条件下,VO_x与WO_x物种和SnTi氧化物之间以V—O—Ti(Sn)和W—O—Ti(Sn)键形式相互作用,提高了VO_x物种可还原能力、促进了具有更多B酸酸量四面体WOx物种和V^(5+)物种生成.VW/SnTi催化剂表面VO_x物种与WO_x物种之间的相互作用更强.因此,VW/SnTi催化剂具有更好的SCR活性.SnO2 additives were added to TiO2 carrier of V2O5-WO3/ TiO2 catalyst by co-precipitation and the effect of SnO2 content on the structure,dispersed species and SCR performance of the catalyst were investigated by various physical and chemical methods. XRD,Raman and BET results showed that SnO2 additives can interact with TiO2 through Sn—O—Ti bond,promoting the TiO2 crystalline phase transfer from Anatase to Rutile. H2-TPR,XPS and NH3-DRIFTS results showed that VOx species and WOx species could interact with SnTi oxide through V—O—Ti（ Sn） and W—O—Ti（ Sn） bonds. Under special circumstances,this interaction could improve the reducibility of VOx species and favor the formation of V^5＋ species and tetrahedral WOx species with more B acid site,and also enhanced the interaction between VOx species and WOx species over VW / SnTi catalysts. As a result,these advantages brought about the better SCR activity for VW/SnTi catalysts.

关 键 词：V2O5-WO3/TIO2催化剂 掺杂 SnTiOx复合氧化物 DENOX 作用机制 

分 类 号：O643[理学—物理化学] O643.3[理学—化学]