Mn_(1-x)Ag_xCo_2O_4尖晶石复合氧化物催化去除碳烟颗粒的研究

COMBUSTION OF SOOT PARTICULATE OVER Mn_(1-x)Ag_xCo_2O_4 SPINEL OXIDE

采用溶胶-凝胶法制备了Mn_(1-x)Ag_xCo_2O_4催化剂,通过X射线衍射(XRD)、傅里叶红外吸收光谱(FT-IR)、氧气程序升温脱附(O_2-TPD)和程序升温氧化(TPO)等手段对催化剂进行表征,在自制的反应装置上,利用程序升温技术对催化剂进行评价。结果表明,所制样品Mn_(1-x)Ag_xCo_2O_4均为尖晶石型复合氧化物,且具有良好的催化碳烟燃烧活性,当x为0.4时,样品Mn_(0.6)Ag_(0.4)Co_2O_4的催化活性最高,其催化燃烧碳烟的T_(50)(50%碳烟的燃烧峰对应的温度)为325℃,比碳烟非催化燃烧时降低260℃。

A series of Mn1xAgxCo2O4spinel oxide catalysts were prepared by sol gel method and characterized by XRD,FI-IR,O2TPD,and TPO techniques.The performance of the catalysts was evaluated in a home made device by temperature programme.The results showed that the as prepared catalysts possess spinel structures and exhibit high catalytic activity for soot combustion Mn06Ag04Co2O4catalyst has the best activity with a T50(the temperature at which soot conversions is50%)of325℃,260℃lower than the temperature needed in non catalytic soot combustion.