中高温NH_(3)-SCR反应的钨铈锆复合金属氧化物催化剂  

W-Ce-Zr mixed metal oxide catalyst for medium-high temperature NH_(3)-SCR reaction

作　　者：徐佳 张新剑 戚国琴 浦渊竞 赵洁 郭燏 XU Jia;ZHANG Xinjian;QI Guoqin;PU Yuanjing;ZHAO Jie;GUO Yu(State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China;School of Environmental Sciences and Engineering, Nanjing Tech University, Nanjing 211800, China)

机构地区：[1]南京工业大学化工学院材料化学工程国家重点实验室,江苏南京211800 [2]南京工业大学环境科学与工程学院,江苏南京211800

出　　处：《南京工业大学学报（自然科学版）》2022年第4期395-404,共10页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省自然科学基金(BK20200688)。

摘　　要：制备一系列的单/双/三组元的钨铈锆复合金属氧化物催化剂,测试催化剂在200~550℃的NH_(3)-选择性催化还原(NH_(3)-SCR)反应中的脱硝活性。考察催化剂制备方法、W含量和催化剂组成对催化剂脱硝活性的影响。使用N_(2)吸附-脱附、X线衍射仪(XRD)、X线光电子能谱(XPS)和NH_(3)程序升温脱附(NH_(3)-TPD)对催化剂进行表征。结果表明:与浸渍法、湿混法和水热法相比,共沉淀法制备的催化剂具有最高的脱硝活性;三组元钨铈锆催化剂的脱硝活性显著优于单组元或双组元催化剂,主要原因是催化剂表面W的良好分散、更高的表面氧比例和更多的表面酸位;在40000 h^(-1)的体积空速下,WO_(3)、CeO_(2)和ZrO_(2)的质量分数分别为20%、40%和40%的20W-40Ce-40Zr催化剂在288~513℃时的NO_(x)转化率大于90%,表现出充当燃气机组SCR催化剂的良好潜力。A series of unitary/binary/ternary W-Ce-Zr mixed metal oxide catalysts were prepared to investigate their denitration activity in the NH_(3)-selective catalytic reduction(NH_(3)-SCR)reaction ranging from 200 to 550℃.The effects of catalyst preparation method,catalyst composition and W content on denitration activity were studied.The catalysts were characterized by N_(2) adsorption-desorption,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and NH_(3) temperature-programmed desorption(NH_(3)-TPD).Results showed that the catalyst prepared by the co-precipitation method showed higher denitration activity than the impregnation method,wet mixing method or hydrothermal method.The ternary W-Ce-Zr catalyst showed higher denitration activity than the unitary or binary catalysts,which was associated with the favorable dispersion of W on the catalyst surface,higher surface oxygen ratio and more surface acids.At a space velocity of 40000 h^(-1),the 20W-40Ce-40Zr catalyst with mass fractions of WO_(3),CeO_(2) and ZrO_(2) of 20%,40%and 40%,respectively,exhibited a NO_(x) conversion of above 90%in the temperature range of 288513℃,showing its great potential as an SCR catalyst for natural gas generator set.

关 键 词：NH_(3)-SCR 复合金属氧化物 催化剂 脱硝活性 废气处理 烟气脱硝 

分 类 号：O643.36[理学—物理化学]