Abstract: 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-41support 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.

Key words: nano-sized gold, oxidation of cyclohexane, photocatalysis, mild condition

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10 nm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1.0 MPa及250 W紫外灯光照8 h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%.

关键词: 纳米金, 环己烷氧化, 光催化, 温和条件