硅胶微球负载钛硅分子筛TS-1催化剂的制备及对苯氧化合成苯酚的催化性能

Preparation and Catalytic Properties for Synthesis of Phenol by Oxidizing Benzene of TS-1 Loaded on Silica Gel Microsphere

将硅胶微球浸渍于钛硅分子筛(TS-1)合成液中,经晶化、焙烧制得负载TS-1分子筛硅胶微球催化剂。用XRD、IR和SEM测试技术对其进行表征,将其用于过氧化氢氧化苯合成苯酚的反应中。结果显示,TS-1分子筛能够很好地负载于硅胶表面,晶化温度160℃,晶化时间72 h,焙烧温度550℃,焙烧时间6 h时,获得的催化剂显示良好的催化性能。在苯和H2O2初始原料量分别为0.5和0.1 mo、l催化剂加入量为8 g、反应温度为60℃条件下,经过3 h的反应,苯的转化率达到10.32%,苯酚选择性达到97.12%。9次重复使用后的苯转化率为9.42%,苯酚选择性为93.14%。

Catalysts of titanosilicate zeolite（TS-1） supported on silica gel microsphere were prepared after direct crystallization and calcination of the microspheric silica gel soaked in the TS-1 synthetic solution,in order to produce catalysts with good catalytic and recycling properties.The catalysts were characterized by XRD,IR and SEM,and were used in the synthesis of phenol by a direct oxidation of benzene with the hydrogen peroxide as the oxidant.The result showed that TS-1 molecular sieve was loaded on the surface of silica gel very well.On the conditions with the crystallization temperature at 160 ℃,crystallization time of 72 h,calcination temperature of 550 ℃,and calcination time of 6 h,the catalysts prepared showed good catalytic properties.On the conditions of the initial material content of benzene 0.5 mol and hydrogen peroxide 0.1 mol,catalyst 8 g,the reaction temperature at 60 ℃,and the reaction time 3 h,the convertion of benzene was 10.32%,and the selectivity to phenol was 97.12%.After recycling for nine times,the convertion of benzene was 9.42%,and the selectivity to phenol was 93.14%.