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

Abstract

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%.