Ultrasonic-Assisted Preparation of WO3/SiO2 from Rigid Silicon Spheres for the Thiolation of Dimethyl Sulfide to Methanethiol

WO3/SiO2 catalysts were synthesized by ultrasonic-impregnation method. The physical and chemical characteristics of these catalysts and their performance for dimethyl sulfide (DMS) thiolation to methanethiol were investigated. Tungsten oxide enhanced the acidity of the catalyst, and the tungsten oxide loading determined the quantity of surface acidic sites. DMS conversion was significantly enhanced with increasing WO3 content. The purpose of SiO2 was to provide mechanical strength to enhance the durability of the catalysts for long-term exposure to industrial high-pressure and sour conditions. The ultrasonic treatment had a positive effect on the structure of the catalysts and their performance. A comprehensive analysis of the conversion, selectivity, and industrial application of these catalysts showed that the 6%WO3/SiO2(100 W-1 h) catalyst, which was ultrasonicated at 100 W for 1 h, was the optimal catalyst. [GRAPHICS] .

Automated summary

WO3/SiO2 catalysts synthesized by ultrasonic-impregnation method showed enhanced acidity and durability, and exhibited excellent catalytic performance for the thiolation of DMS to methanethiol.