软铝石固载四(4-羟基苯基)钴卟啉催化氧化环己烷  

Cyclohexane oxidation over boehmite supported cobalt tetra(4-hydroxyphenyl)porphyrin

作　　者：李天明[1] 黄冠[1] 曹轩[1] 向峰[1] 罗宗昌[1] 

机构地区：[1]广西大学化学化工学院广西石化资源加工及过程强化技术重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2011年第3期417-422,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51063001);广西自然科学重点项目(2010GXNSFD013014);广西大学实验改革项目

摘　　要：为模拟细胞色素P-450酶结构功能的催化氧分子羟基化底物作用,将meso-四(4-羟基苯基)Co卟啉[Co THPP]物理吸附和配位固载到软铝石[BM]上获得固载催化剂[Co THPP/BM],用紫外-可见光谱(UV-vis)、傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、热重分析(TG)和场发射电子扫描显微(FESEM)技术对此固载催化剂进行表征,并用来催化空气氧化环己烷。结果表明:在最适宜反应温度和压力分别为150℃和0.9 MPa的反应条件下,用仅含1.30×10-6 mol Co THPP的固载催化剂,可以有效重复催化11次,催化效能平均值分别为:环己烷转化率6.32%,选择性(酮+醇)87.93%,催化剂转化数1.06×105。而在同等条件下,未固载的Co THPP只能催化一次即耗完。表明:软铝石是一种优良的载体,固载这种容易被氧化而且催化活性比较低的四(4-羟基苯基)钴卟啉后,不仅对其具有良好的保护作用,而且能提高其有效催化效能。In order to mimic the structure and function of cytochrome P-50 for catalytic hydroxylation of substance in vivo,boehmite supported cobalt meso-tetra（4-hydroxyphenyl） porphyrin [Co THPP/BM] was prepared by the way of adsorption and coordination,and characterized using UV-vis,FT-IR,XRD,TG and FESEM techniques.This compound was used as a catalyst for aerobic oxidation of cyclohexane.The results showed that a quantity of catalyst containing only 1.30×10^-6 mol of CoTHPP could be efficiently reused 11 times for the oxidation of cyclohexane,on average,with 6.32% cyclohexane conversion,87.93% selectivity for K/A oil,and a catalyst turnover numbers of 1.06×10^5,under the optimal reaction conditions of 150 ℃ and 0.9 MPa.Under the same reaction conditions,the unsupported catalyst,Co THPP could only be used once-off.This confirmed that boehmite is an excellent support and has a good protection and improves the catalysis of Co THPP.

关 键 词：软铝石 四(4-羟基苯基)钴卟啉 空气 氧化 环己烷 

分 类 号：O643[理学—物理化学]