氧化锰改性氧化硅负载金催化剂的制备及其对苯甲醇的选择性催化氧化  

Preparation of Gold Catalyst Supported on SiO_2 Modified by Manganese Oxide for Catalytic Selective Oxidation of Benzyl Alcohol

作　　者：周静[1] 杨再波[1] 柏任流[1] 李锋[1] 王珏[1] 

机构地区：[1]黔南民族师范学院化学与化工系,贵州都匀558000

出　　处：《精细化工》2014年第7期857-861,共5页Fine Chemicals

基　　金：贵州省教育厅优秀科技创新人才项目(黔教合KY字[2013]155)~~

摘　　要：为实现醇的高效气相选择性氧化,以四氧化三锰改性氧化硅为载体制备了负载型金催化剂。结果表明,催化剂载体经过四氧化三锰改性后,催化剂催化活性明显提高,当反应温度为250℃时,苯甲醇的转化率及产物苯甲醛的选择性可分别达到96%和98%。采用X射线粉末衍射(XRD)和透射电镜(TEM)对催化剂进行了表征,结果表明,低负载量的四氧化三锰在氧化硅表面实现了单层分散。由于金和单层分散的四氧化三锰之间的相互作用,使该催化剂体现出良好的醇气相选择性催化氧化性能。In order to achieve the highly effective gas-phase selective oxidation of alcohols, the gold catalyst was prepared using Mn3O4-modified SiO2 as support. The results show that benzyl alcohol conversion and benzaldehyde selectivity were enhanced over the modified catalyst. At 250℃, benzyl alcohol conversion of 96% and benzaldehyde selectivity of 98% could be achieved. The catalysts were characterized by means of X-ray diffraction （XRD） and transmission electron microscope （TEM）, and the results show that the Mn3O4 was dispersed in the form of monolayer. The modified catalyst exhibited excellent performance for the selective oxidation of benzyl alcohol, which was attributable to the Au- Mn3O4 interaction.

关 键 词：金催化剂 醇氧化 氧化硅 四氧化三锰 相互作用 催化与分离提纯技术 

分 类 号：O643.3[理学—物理化学]