Study on catalytic combustion of benzene over cerium based catalyst supported on cordierite

黄琼^1,2，严小康^1,2，李兵^1,2，陈英文^1,2，祝社民^1,3，沈树宝^1,2

1. State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing University of Technology2. College of Life Science and Pharmaceutical Engineering,Nanjing University of Technology3. College of Materials Science and Engineering,Nanjing University of Technology

摘 要：A series of MnCeOx catalysts supported on cordierite honeycomb （Cord） were prepared by a combustion synthesis method using Mn（NO3）2 , Ce（NO3 ）2·6H2O and citric acid. The effect of the molar ratio of Mn/Ce, calcination time, the amount of citric acid and the effect of water vapor on the catalytic properties for the complete oxidation of benzene were investigated. These catalysts were characterized by X-ray diffraction （XRD）, H 2 temperature-programmed reduction （H2 -TPR）, O2 temperature programmed desorption （O2 -TPD） and scanning electron microscopy （SEM） techniques. The results indicated that the MnCeOx /Cord catalyst with Mn/Ce molar ratio of 1:1, calcining for 7h and M n+ /（citric acid） molar ratio of 6 exhibited the highest catalytic activity. When the concentration of benzene was 1500 ppm and the gaseous hourly space velocity was 20000h -1 , the conversion of toluene was 99.1% at the reaction temperature of 300 oC.

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