微波催化反应中Fe_2O_3/γ-Al_2O_3的制备及催化性能研究  

Preparation of Fe_2O_3/γ-Al_2O_3 in microwave catalytic reaction and its catalytic properties

作　　者：李娜[1] 丁洁莲[1] 赵贤广[1] 赵浩[1] 徐炎华[1] 

机构地区：[1]南京工业大学环境学院,江苏省工业节水减排重点实验室,江苏南京210009

出　　处：《环境污染与防治》2012年第12期9-12,15,共5页Environmental Pollution & Control

基　　金：国家"863计划"重大专项课题(No.2007AA06A402);江苏省省级环保科技项目(No.2007021);国家水体污染控制与治理科技重大专项(No.2008ZX07101-003);江苏省自然科学基金重点研究专项(No.BK2011016)

摘　　要：以γ-Al2O3为载体,通过等体积浸渍法制备一种载铁催化剂。以微波非均相Fenton反应对甲基橙的脱色效果作为判断催化剂活性的依据,分别考察浸渍液(Fe(NO3)3.9H2O溶液)浓度、焙烧温度、焙烧升温速率、焙烧时间对催化性能的影响,并对复杂协同体系中的反应机制进行初步探讨。结果表明,在浸渍液浓度为8%(质量分数)、焙烧温度为300℃、焙烧升温速率为10℃/min、焙烧时间为2h时催化剂Fe2O3/γ-Al2O3活性最优;复杂协同体系作用机制表现为微波非热效应降低甲基橙分子化学键强度,热效应促使催化剂表面产生"热点",3者(微波、H2O2、催化剂)协同强化催化氧化反应。然而,在微波催化过程中,催化剂孔道坍塌可能影响催化剂活性。Iron supported catalyst was prepared by isometric impregnation method with γ-Al2O3 as carrier. The catalytic property of Fe2O3/γ-Al2O3 was determined by decolorization of methyl orange （MO） in microwave-heteroge-neous Fenton system. Effect of preparing conditions, such as ferric nitrate concentration in impregnation liquid, calci-nation temperature, roasting time and heating rate on Fe2O3/γ-Al2O3 catalytic property was investigated, and the cat- alytic degradation mechanism of MO in complex coordinated system. The results showed that the optimum conditions for Fe2O3/γ-Al2O3 preparation were 8 % （mass fraction） Fe（NO3 ）3 · 9 H2 O in impregnation liquid, calcination under 300 ＊C for 2 h with heating rate of 10 ＂C/min. The Fe2O3/γ-Al2O3 achieved under these conditions presented the best catalytic activity. The mechanism of coordinated system was non-thermal effects of microwave to reduce molecular chemical energy, the thermal effects to promote hot spots in surface of Fe2O3/γ-Al2O3 and the synergistic action of mi-crowave, H2O2 and catalyst. But microwave would cause the pore collapse and further affect the activity of the catalyst.

关 键 词：FE2O3 Γ-AL2O3 催化氧化 甲基橙微波 

分 类 号：X703[环境科学与工程—环境工程]