铈改性CuMn/Al2O3/堇青石整体催化剂的甲苯催化燃烧性能研究OACSTPCD

Catalytic combustion is an effective approach to remove volatile organic compounds,in which the development of highly active and durable catalyst is extremely crucial.Herein,a series of CuMnCex/Al2O3/cordierite monolithic catalysts were synthesized by using the ultrasonic-assisted impregnation method.The physicochemical properties were comprehensively characterized via the BET,XRD,SEM,EDX,H2-TPR,O2-TPD,XPS and EPR techniques.The results showed that the catalytic activity of CuMnCex/Al2O3/Cor for toluene combustion was strongly affected by the Ce content.The CuMnCe2/Al2O3/Cor monolithic catalyst showed the best catalytic activity with toluene conversion of 90％at 263 ℃ under toluene concentration of 1 g/L and space velocity of 78000 mL/(g·h).Meanwhile,the well-dispersed CeO2 in the CuMn matrix not only improved the content of oxygen vacancies and the mobility of oxygen species,but also enhanced the low-temperature reducibility of the catalyst.Moreover,the CuMnCe2/Al2O3/Cor monolithic catalyst exhibited an excellent stability in the long-term test and cycle ability test.