改性赤泥负载Pt催化剂催化氧化甲苯的性能

方宏萍; 梁文俊; 马琛; 马连刚; 李桂贤

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (3) : 1244-1252.

大气污染与控制

改性赤泥负载Pt催化剂催化氧化甲苯的性能

方宏萍^1,2, 梁文俊², 马琛², 马连刚¹, 李桂贤¹

作者信息 +

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

FANG Hong-ping^1,2, LIANG Wen-jun², MA Chen², MA Lian-gang¹, LI Gui-xian¹

Author information +

文章历史 +

摘要

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xPt/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Fe₂O₃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.

Abstract

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 Fe₂O₃ 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.

导出引用

方宏萍, 梁文俊, 马琛, 马连刚, 李桂贤. 改性赤泥负载Pt催化剂催化氧化甲苯的性能[J]. 中国环境科学. 2024, 44(3): 1244-1252

FANG Hong-ping, LIANG Wen-jun, MA Chen, MA Lian-gang, LI Gui-xian. Catalytic performance of Pt-supported modified red mud catalyst for toluene catalytic oxidation[J]. China Environmental Science. 2024, 44(3): 1244-1252

中图分类号： X705

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