Cu_(x)Mn_(1-x)Ce_(0.75)Zr_(0.25)O_(y)催化降解甲苯的性能

CATALYTIC DEGRADATION PERFORMANCE OF TOLUENE OVER Cu_(x)Mn_(1-x)Ce_(0.75)Zr_(0.25)O_(y)

采用溶胶凝胶法制备了双主金属、双助剂的Cu_(x)Mn_(1-x)Ce_(0.75)Zr_(0.25)O_(y)催化剂,在固定床反应器中评价了催化剂降解甲苯的性能,并采用XRD、H_(2)-TPR、O_(2)-TPD和Raman对催化剂进行表征。试验结果表明:催化剂中Cu含量的增加有助于增强Cu-Ce金属之间的相互作用,增加催化剂中的氧空位浓度和晶格氧含量,提高催化剂低温还原性,从而促进催化活性的提高。Cu_(1)CeZr催化剂降解甲苯活性最好,其完全降解甲苯的温度(T_(100))为220℃,比Mn_(1)CeZr催化剂低60℃。

A series of bimetallic and biassistant Cu_(x)Mn_(1-x)Ce_(0.75)Zr_(0.25)O_(y) catalysts were prepared by sol-gel method. The catalytic degradation performance of toluene over the catalysts was tested in a fixed-bed reactor. The relationships between the catalytic activity of toluene degradation and catalyst structure were explored by XRD,H_(2)-TPR,O_(2)-TPD and Raman methods.It was found that the increase of copper content could enhance the interaction between Cu-Ce,and improve the oxygen vacancy concentration,lattice oxygen content and low temperature reducibility,thus promote the catalytic activity. Cu_(1)CeZr catalyst exhibited the best activity for toluene degradation,and the temperature of complete degradation of toluene was 220 ℃,which was 60 ℃ lower than that of Mn_(1)CeZr catalyst.