Abstract: The reaction mechanism and kinetics of carbonyl sulfide (COS) hydrolysis on LS-05 catalyst were studied. The mass spectrum (MS) signal intensity changes of reactants and different products during the room-temperature adsorption, temperature programmed desorption and surface reaction of COS and H2S on the catalyst were investigated, and the mechanism of catalytic hydrolysis of COS was analyzed. By adjusting the reaction temperature and reactant concentration, a series of kinetic data were obtained, and then the corresponding reaction rate equation was established to analyze the reaction process of COS on the catalyst. The results showed that COS hydrolysis accorded with Langmuir- Hinshelwood (L-H) mechanism. The determination coefficient R² of the model regression equation was 0.998, and the error between the regression result and the experimental data was less than 10%，which indicated that the regression results of the model had a high correlation with the experimental data.

Key words: carbonyl sulfide, LS-05 catalyst, reaction mechanism, kinetic model