CrCl_3掺杂对钒钛基SCR催化剂脱硝活性的影响  

Influence of CrCl_3 doping on vanadium-titanium catalysts for selective catalytic reduction

作　　者：段景卫[1] 王学涛[1] 张福顺 刘剑光 陈江涛 崔建峰 DUAN Jingwei;WANG Xuetao;ZHANG Fushun;LIU Jianguang;CHEN Jiangtao;CUI Jianfeng(Henan University of Science and Technology, Luoyang 471003, China;Henan KNT Environment Protection Technology Co. Ltd., Zhengzhou 452370, China;Shanxi Environment Protection New Energy Co. Ltd., Xi'an 710075,China)

机构地区：[1]河南科技大学能源与动力工程系,河南洛阳471003 [2]河南康宁特环保科技股份有限公司,郑州452370 [3]陕西环保新能源有限公司,西安710075

出　　处：《功能材料》2018年第3期3103-3108,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50806020);河南省科技创新人才计划(杰出青年)资助项目(114100510010);河南省科技厅科技攻关资助项目(152102210280);河南省自然科学基金资助项目(182300410256)

摘　　要：采用等体积浸渍法制备了不同浓度的CrCl_3钒钛基商业催化剂,利用XRD、BET、XPS、H_2-TPR、NH_3-TPD等多种表征手段对催化剂进行了表征,结果表明,Cr在TiO_2载体表面处于高度分散状态,呈无定形相形式;反应温度200~500℃内,含铬催化剂的最高脱硝效率提高7%,在低温时随Cr/V摩尔比的增大而提高,在高温时有较宽的稳定反应窗口;BET结果表明Cr的添加明显提高了催化剂的比表面积、总孔容和孔结构参数;负载铬盐后脱硝催化剂表面弱酸性位的活性中心数目和密度随着含铬量的增大而增大;商业催化剂中钒元素主要以V^(4+)价态存在,随着Cr/V摩尔比的增大,催化剂中V^(4+)所占比例下降而V^(5+)所占比例升高;负载铬化物后铬元素主要以Cr^(3+)价态存在。Vanadium-titanium based commerce SCR catalyst is doped with different concentration CrCl3by volume impregnation method.By applying SCR denitration activity test,XRD,BET,XPS,H2-TPR,NH3-TPD,etc technologies,the catalyst was characterized.The research shows that Cr supported on the TiO2becomes higher monodisperse status and amorphous crystal status.Nevertheless,the denitration efficiency of catalyst loaded Cr compound rises7%during200-500℃reaction temperature area.The denitration efficiency becomes higher as the molar ratios of Cr/V increasing at low temperature,while these catalysts have a great deal of wider and steadier reaction temperature area at high temperature.The unit surface area,total pore volume and average pore diameter of the catalysts become a bit bigger when loaded with Cr.The number and density of active center on weak acid sites of the catalysts increase with the increase of Cr content.In commerce catalyst,the vanadium element exists mainly in V(Ⅳ)valence.With the increase of Cr/V molar ratio,the proportion of V(Ⅳ)in the catalyst decreases and the proportion of V(Ⅴ)increases.Cr element mainly exists as+3valence state when this commerce catalyst is doped with Cr compound.

关 键 词：铬 钒钛基 脱硝催化剂 TPR TPD XPS 

分 类 号：X701[环境科学与工程—环境工程]