Regulation of silver-based catalysts and study of its catalytic oxidation performance for formaldehyde
Silver-based catalysts exhibit a good oxidation ability and great promising application in environmental catalysis.Silver-based catalysts are prepared by an incipient wetness impregnation method.The effects of preparation process conditions such as additive types,pretreatment atmosphere and temperature,and the pore structure of the support for formaldehyde(HCHO)catalytic oxidation performance on silver-based catalysts are investigated.The experimental results suggest that adding 3％of Fe promoter to 6％of Ag/SBA-15 catalyst can significantly improve the HCHO catalytic oxidation performance of catalysts.The treatment of O2 and H2 can improve the activity of the catalyst.While the pore structure of the support shows little effects on HCHO catalytic oxidation activity.The performance of silver-based catalyst prepared by co-impregnation method is better than that prepared by two step impregnation method.AgFe/SBA-15 catalyst prepared by co-impregnation method demonstrates good catalytic oxidation performance for HCHO after being treated with O2(600 ℃)and H2(400 ℃),successively,and 100％of conversion of HCHO to CO2 and H2O is obtained at 75 ℃.
formaldehydecatalytic oxidationsilver-based catalystpreparation process conditions
万方数据
维普
