纳米γ-Fe_2O_3复合氧化物的制备与气敏性质  

CATALYTZC AND GAS-SENSING PROPERTIES OF NANOSIZED γ-Fe_2O_3 COMPLEX OXIDE

作　　者：马丽景[1] 林茂[1] 闫涛[1] 李英霞[1] 黄小葳[1] 陈霭 宋永吉[2] 

机构地区：[1]北京化工大学理学院,北京100029 [2]北京石油化工学院材料与化工学院,北京102617

出　　处：《化工学报》2004年第2期264-267,共4页CIESC Journal

基　　金：国家自然科学基金 (No 2 0 2 760 0 6);北京市自然科学基金 (No 2 0 3 2 0 14 )资助项目~~

摘　　要：用溶胶 凝胶法制备了纳米γ Fe2 O3 及γ Fe2 O3 /SiO2 复合氧化物 ,用热重 差热分析 (TG DTA)、X射线衍射 (XRD)、透射电镜 (TEM)和二次粒度分布对纳米粒子进行表征 ,并考察了γ Fe2 O3 、γ Fe2 O3 /SiO2 敏感材料对CO、H2 、C2 H4、C6H6等气体的敏感系数及其焙烧温度对敏感系数的影响 ,并选择了敏感材料对气体检测的最佳工作温度 .结果表明 ,γ Fe2 O3 /SiO2 纳米复合氧化物中SiO2 对提高γ Fe2 O3 的相变温度、加强热稳定性及提高催化和气体敏感系数起很大作用 .Nanosized γ-Fe 2O 3 and γ-Fe 2O 3/SiO 2 complex oxides were prepared by the sol-gel method, and sensing elements were fabricated. Phase composition, grain size, particle size distribution of the nanosized oxides were characterized by TG-DTA,XRD,TEM and Zetasize distribution respectively. The sensitivity of the sensing elements to CO, H 2, C 2H 4, C 6H 6 and the effects of calcination temperature on the sensitivity of two typical elements were examined. The operating temperature of elements to different gases was obtained. The results showed that phase transition temperature, thermal stability,catalytic activity and gas sensitivity of γ-Fe 2O 3 were enhanced due to the SiO 2 present. The thermal stability of gas sensing and catalytic materials based on γ-Fe 2O 3 was expected to be basically solved.

关 键 词：纳米催化材料 FE2O3 气敏性质 相变温度 

分 类 号：TQ138.11[化学工程—无机化工]