TiO2助剂对乙苯脱氢催化剂性能的影响

摘要

研究了TiO2助剂对乙苯脱氢催化剂的结构和其催化性能的影响以及对催化剂中铁钾尖晶石活性相形成的作用,并对催化剂的物理化学性质进行了表征.表征结果表明,引入适量的TiO2能显著促进催化剂中活性相K2Fe22O34的形成,减小CeO2的晶粒尺寸,提高其在催化剂中的分散性;另一方面,添加助剂TiO2后可以降低CeO2和活性相K2Fe22O34的还原温度,为反应提供更多的氧缺位和酸碱中心,提高了催化剂乙苯脱氢反应的活性.%The effect of additives TiO2 on the formation of reactive phase Fe-K spinel and on the catalytic activity was investigated.The properties of catalyst were characterized by XRD,TPR,XPS,BET and SEM.The SEM and XRD results showed that adding moderate TiO2 can significantly improve the formation of catalytic reactive phase K2Fe22O34,with decreasing the particle size of CeO2 and improving its dispersion in catalyst.Furthermore,the XPS and TPR results showed that doping of TiO2 can reduce the reduction temperature of CeO2 and active phase K2Fe22O34,which increases lattice oxygen defects and acid-base sites,improving the activity of the catalyst for ethylbenzene dehydrogenation reaction.