Rb_2O掺杂对MnCe/ZrO_2催化燃烧碳烟的性能影响  

Effects of Rb_2O doping on the activity of Mn-C/ZrO_2 catalyst for soot combustion

作　　者：徐晨峻 朱秋莲[1] 黄金星[1] 胡小波[1] 卢晗锋[1] 

机构地区：[1]浙江工业大学化学工程学院催化反应工程研究所,浙江杭州310014

出　　处：《工业催化》2015年第7期531-535,共5页Industrial Catalysis

摘　　要：采用柠檬酸溶胶-凝胶法制备掺杂不同Rb2O含量的MnCe/ZrO2复合氧化物催化剂,采用热重法考察其催化燃烧碳烟的活性,并借助XRD和H2-TPR手段探讨掺杂不同Rb2O含量对MnCe/ZrO2催化燃烧特性的影响。结果表明,适量Rb2O可以使催化剂与碳烟在高温下接触更为紧密,吸附空气中CO2,形成碳酸盐物质,提高催化剂的氧含量,并作为活性氧传输中心,提升MnCe/ZrO2催化燃烧性能。与未掺杂MnCe/ZrO2催化剂相比,完全燃烧温度下降31℃,碳烟在394℃内完全氧化。A series of MnCe/ZrO2 catalysts with different contents of Rb2O was prepared by citric acid sol-gel method. Their catalytic activity for soot combustion was investigated by thermal gravimetric-differential thermal analysis. The as-prepared catalysts were characterized by XRD and H2-TPR. The results showed that the addition of appropriate amount Rb2O favored the contact of the catalyst with soot in high temperature and the absorption of CO2 to form carbonate,increasing the surface mobility of active oxygen species, which enhanced the catalytic combustion activity of MnCe/ZrO2 catalyst. Compared with MnCe/ ZrO2 catalyst, the complete burning temperature of MnCe/ZrO2 catalysts doped with Rb2O decreased from 425 ℃ to 394 ℃.

关 键 词：催化化学 溶胶-凝胶法 活性氧 MnCe/ZrO2复合氧化物催化剂 催化燃烧碳烟 

分 类 号：TQ426.96[化学工程] O643.36[理学—物理化学]