Mn1-xAgxCo2O4尖晶石复合氧化物催化去除碳烟颗粒的研究

摘要

A series of Mn1-x Agx Co2O4 spinel oxide catalysts were prepared by sol-gel method and characterized by XRD,FI-IR,O2-TPD,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.Mn0.6 Ag0.4 Co2O4 catalyst has the best activity with a T50 (the temperature at which soot conversions is 50％)of 325 ℃,260 ℃ lower than the temperature needed in non-catalytic soot combustion.%采用溶胶-凝胶法制备了Mn1-xAgxCo2O4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(O2-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Mn1-xAgxCo2O4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Mn0.6Ag0.4Co2O4的催化活性最高,其催化燃烧碳烟的T50(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℃.