Abstract: The selective oxidation catalyst LS-06 was prepared by impregnation method using chemical inertness fumed silica as a carrier and the composite oxide of modifier and iron oxide as active component.The results of laboratory evaluation showed that the selective oxidation conversion rate of hydrogen sulfide over the catalyst is more than 95% and the sulfur yield is more than 90% at reaction temperature of 200 ℃，the gas volume space velocity of 1 600 h-1 and the volume concentration of hydrogen sulfide of 1%—3%.The results of 1 000 h long cycle contrast experiment indicated that the LS-06 catalyst has a good activity and stability，and the comprehensive performance reaches the same level as foreign similar catalyst.

Key words: H2S, selective oxidation, SiO2, Claus process