摘要
Catalytic ozonation of aqueous solutions of oxalic acid was examined in the presence of graphite-supported platinum catalysts.The catalytic activity of graphite was significantly enhanced by loading platinum.The removal efficiency of oxalic acid was 3.0%,47.6%and 99.3%for ozonation alone,graphite catalytic ozonation and Pt/graphite catalytic ozonation in 30 min under the experimental condi-tion,respectively.The influence of support pretreatment,solvent,impregnation time,platinum loading amount and reduction temperature on the activity of Pt/graphite catalyst was investigated.The pretreatment of graphite support had no effect on activity improvement of Pt/graphite catalyst.Solvent and impregnation time also had no great effect on the activity.Platinum loading amount and reduction temperature influenced the catalyst activity significantly.The optimal catalytic performance of Pt/graphite was obtained when 1.0%platinum loading and 623 K of reduction temperature was adopted.The Pt/graphite catalyst was used for five times with no significant decrease in its activity and more than 90%oxalic acid removal was obtained.
基金
This work was supported by the National Natural Science Foundation of China(Grant No.50378028).
