改性赤泥负载Pt催化剂催化氧化甲苯的性能

Catalytic performance of Pt-supported modified red mud catalyst for toluene catalytic oxidation

以改性赤泥为载体,采用浸渍方法制备低成本改性赤泥(MRM)负载Pt催化剂,并探究Pt含量对Pt/MRM催化剂催化氧化甲苯活性影响.结果表明0.4Pt/MRM表现出最佳的催化活性,在230℃时甲苯转化率为100%.当空速高达120000h^(-1)时0.4Pt/MRM催化剂依然能保持着较高的催化活性.当甲苯进口浓度为5000mg/m3时仍可以有效氧化甲苯.采用XRD、FT-IR、BET、H2-TPR和O2-TPD等手段进行表征测试分析发现,MRM的比表面积较RM大幅度提高,使MRM能够更好分散活性组分Pt,成为合适的活性组分Pt的催化剂载体.同时所制备的x Pt/MRM催化剂具有较高的比表面积和良好的孔结构.改性赤泥中Fe_(2)O_(3)与活性组分Pt物种相互作用,使催化剂的总氧解吸量增大,提高了催化剂表面氧的迁移率,从而提高了催化效率.

A low-cost modified red mud supported Pt catalyst was prepared by impregnation method,and the effect of Pt content on catalytic oxidation activity of toluene on Pt/MRM catalyst was investigated.0.4Pt/MRM showed the best catalytic activity,and the toluene conversion rate reached 100%at 230.The catalytic activity℃of 0.4Pt/MRM was still higher when the airspeed was up to 120000h^(-1).Toluene can be oxidized effectively in a wide range of toluene concentrations.XRD,FT-IR,BET,H2-TPR and O2-TPD were used to characterize.The specific surface area of MRM was significantly higher than RM,which can disperse the active component Pt better and become a suitable catalyst carrier for the active component Pt.The prepared xPt/MRM catalyst had high surface area and good pore structure.The interaction between Fe_(2)O_(3)and Pt species in the modified red mud increased the total oxygen desorption capacity of the catalyst,improved the mobility of oxygen on the catalyst surface,and the catalytic efficiency.