钼铁催化剂的微结构及其对二甲苯选择氧化的催化性能  

Microstructure of Mo-Fe Catalysts and Their Catalytic Performance for Selective Oxidation of p-Xylene

作　　者：刘自力[1,2] 梁历辉 文怀有[2] 秦祖赠[2] 刘艳冰[2] 陈胜洲[1] 

机构地区：[1]广州大学化学化工学院,广东广州510006 [2]广西大学化学化工学院,广西南宁530004 [3]中国石油华东销售分公司,上海200232

出　　处：《化学反应工程与工艺》2009年第5期442-446,共5页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(20776031)

摘　　要：采用溶胶-凝胶法制备了Mo-Fe催化剂,考察了其对对二甲苯催化氧化合成对苯二甲醛的催化性能。结果表明,对二甲苯在该催化剂上的转化率为86%,对苯二甲醛的选择性为50%。采用X射线衍射(XRD)、程序升温还原(TPR)和射线光电子能谱(XPS)等手段对Mo-Fe催化剂进行了表征。分析表明,Mo-Fe催化剂主要由MoO3与Fe2(MoO4)3两种物相组成,两者的比例约为11∶8。催化剂稳定性实验结果表明,Mo-Fe催化剂在450℃下反应,其活性可稳定在15左右。催化剂失活主要是催化剂中MoO3被还原为MoO2以及Fe2(MoO4)3结构被破坏。Mo-Fe catalysts were prepared successfully by sol-gel method.Gas-phase catalytic oxidation synthesis of Terephthalaldehyde(TPAL)from p-xylene was used as a probe reaction.The results showed that the conversion of p-xylene was 86% and the selectivity of TPAL was 50% over the Mo-Fe catalyst.The Mo-Fe catalysts prepared by sol-gel method were characterized by X-ray diffraction(XRD),temperature programmed reduction(TPR)and X-ray photoelectronic spectroscopy(XPS).The results indicated that Mo-Fe catalyst was composed of MoO3 and Fe2(MoO4)3 crystals,and molar ratio of MoO3 and Fe2(MoO4)3 was 11/8.The stability experiment of catalysts showed that the catalytic activity of Mo-Fe catalyst can be stabilized for about 15 h at 450 ℃.It was the main reason of deactivation that MoO3 was reduced to MoO2 and Fe2(MoO4)3 structure was destroyed.

关 键 词：钼铁催化剂 对二甲苯 对苯二甲醛 选择氧化 

分 类 号：TQ203.2[化学工程—有机化工]