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.
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.
基金
Project supported by National Natural Science Foundation of China(51172107,21106072)
National Key Technology R&D Program of China(2012BAE01B03)
R&D Project for Environmental Protection of Jiangsu(2011023)
project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
