纳米金复合催化剂制备及其低温选择催化环己烷氧化性能  

Preparation of Nano-sized Gold-doped TiO_2 Catalyst and Its Performance for Selective Oxidation of Cyclohexane at Low Temperature

作　　者：王亚青[1] 周继承[1] 杨晓烽[1] 

机构地区：[1]湘潭大学化工学院,绿色催化与反应工程湖南省普通高校重点实验室,湖南湘潭411105

出　　处：《过程工程学报》2009年第6期1186-1191,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20676111);湖南省教育厅重点基金资助项目(编号:07A073);湖南省高校科技创新团队支持计划资助项目

摘　　要：采用光催化直接还原法将Au(0)负载在TiO2修饰的中孔分子筛MCM-41的孔道内外,采用XRD,N2吸附-脱附,FT-IR,TEM和EDS等手段对所制催化剂进行了表征,并考察了其在温和条件下对环己烷选择性氧化反应的催化性能.结果表明,所制纳米金催化剂的分子筛载体仍具有较高的结晶度,金颗粒粒径在10nm左右.在环己烷氧化反应中,纳米金与TiO2光催化共同作用,使复合催化剂具有低温高催化活性.在温度100℃、压力1.0MPa及250W紫外灯光照8h的条件下,环己烷转化率高达3.9%,目的产物的总选择性为90.2%.Nano-sized Au clusters were deposited into the inner or outer surface of titania-modified MCM-41 by photodeposition method. The prepared samples were characterized by XRD, N2 adsorption isotherm, TEM and EDS. Their catalytic performance for oxidation of cyclohexane was investigated under mild conditions. The results showed that all the MCM-41 support of prepared catalyst samples had high crystallinity and the size of gold particles was about 10 nm. The complex nano-sized gold catalysts exhibited high catalytic activity at low-temperature, due to the synergistic effect of nano-sized gold and photocatalysis for oxidation of cyclohexane. The catalytic performance of the prepared samples for the selective oxidation of cyclohexane under mild conditions using molecular oxygen in a solvent-free system was investigated. The conversion rate of cyclohexane was 3.9% and the total selectivity of purposed products 90.2% under the conditions of 100℃, 1.0 MPa and illumination by 250 W UV-lamp for 8 h.

关 键 词：纳米金 环己烷氧化 光催化 温和条件 

分 类 号：O643[理学—物理化学]