自组装型Pt/γ-Al_2O_3催化剂用于低温去除挥发性有机物(英文)  

Removal of Volatile Organic Compounds at Low Temperature by a Self-Assembled Pt/γ-Al_2O_3 Catalyst

作　　者：李加衡 敖平[1] 李小青[1] 许响生[1] 徐潇潇[1] 高翔[2] 严新焕[1] 

机构地区：[1]浙江工业大学绿色化学合成技术国家重点实验室培育基地,杭州310014 [2]浙江大学能源清洁利用国家重点实验室,杭州310014

出　　处：《物理化学学报》2015年第1期173-180,共8页Acta Physico-Chimica Sinica

基　　金：supported by the Key Innovation Team of Science&Technology in Zhejiang Province,China(2011R50017);National HighTechnology Research and Development Program of China(863)(2013AA065005)~~

摘　　要：分别通过自组装法(AS)和浸渍法(WI)制备得到纳米催化剂Pt/γ-Al2O3-AS和Pt/γ-Al2O3-WI,并用于评价甲苯、异丙醇、丙酮、乙酸乙酯等易挥发性有机物(VOCs)的氧化性能.通过各种表征手段探究了催化剂形态、结构及表面性质与催化剂氧化活性的关系.结果表明,Pt/γ-Al2O3-AS在低温下即可实现VOCs的完全氧化.在气体浓度(体积分数)为1000×10-6,空速为18000 m L·g-1·h-1的条件下,甲苯、异丙醇、丙酮、乙酸乙酯被Pt/γ-Al2O3-AS催化剂完全氧化的温度分别为130、135、145、215°C,展现出了优异的氧化性能,且具有很好的稳定性.该催化剂较高的比表面积、较小的Pt纳米粒径、较好的Pt纳米颗粒分散度、更好的低温还原效果及丰富的表面羟基是具有较高催化活性的重要因素.Pt/γ-Al_2O_3 catalyst nanoparticles were prepared by self-assembly （AS） and wetness impregnation （WI） methods, and evaluated for the oxidation of volatile organic compounds including toluene, isopropanol, acetone, and ethyl acetate. The morphology, structure, and surface properties of the catalyst particles were correlated to their oxidation activity. Toluene, isopropanol, acetone, and ethyl acetate （1000×10^-6, volume fraction） in the feed stream （gas hourly space velocity of 18000 m L·g^-1·h^-1） were completely oxidized and removed by Pt/γ-Al_2O_3oAS at below 130, 135, 145, and 215 ℃, respectively. Pt/γ-Al_2O_3-AS exhibited outstanding activity and stability at high concentrations and space velocities. The high catalytic activity of Pt/γ-Al_2O_3-AS was attributed to its high surface area, small size, finely dispersed Pt nanoparticles, better reproducible activity at low temperature, and a higher number of hydroxyl groups.

关 键 词：Pt/γ-Al_2O_3 易挥发性有机物 催化燃烧 组合型催化剂 

分 类 号：O643.32[理学—物理化学]