Effect of Preparation Parameters on the CO Low-Temperature Oxidation Performance of Au/TiO2 Catalysts
LIU1 Ya-Qiong, Lyu Qian2 , MENG Ming1
(1Tianjin Key Laboratory of Applied Catalysis Science and Engineering, School of Chemical Engineering and Technology,
Tianjin University, Tianjin 300072, China;
2PetroChina Daqing Petrochemical Research Center, Daqing， Heilongjiang 163714， China)
Abstract：
The support TiO2 and its supported catalysts Au/TiO2 were synthesized by sol-gel and depositionprecipitation method, respectively. The effect of several preparation parameters on the activity of the catalysts，such as calcination temperature, gold loading, pH value of reaction solution, kinds of precipitation reagents and presence or absence of Cl-ions, were investigated. The preparation parameters were optimized by using ambient CO oxidation as probe reaction. In addition, the thermal stability of the optimized catalyst 1.0% Au/TiO2 was also investigated. It is confirmed that the optimal calcination temperature is between 200—350 ℃; the best pH value and precipitation reagent are 9 and NaOH, respectively; when the gold loading is in the range of 0.5%—5.0%, the higher gold contents the better catalytic activity and the higher thermal stability. The presence of Cl-ions leads to an obvious decrease of the catalytic activity of Au/TiO2. The results of circular tests using different concentration of CO on the optimized Au/TiO2 catalysts showed that the CO conversion was always 100% at ambient temperature even after undergoing three cycles and a continuous reaction of 2 160 min.
LIU1 Ya-Qiong, Lyu Qian2 , MENG Ming1.Effect of Preparation Parameters on the CO Low-Temperature Oxidation Performance of Au/TiO2 Catalysts[J]. Chemcial Industry and Engineering, 2013,30(5): 1-6
2013, Vol. 30 
