Coupling catalytic hydrolysis and oxidation for CS sub(2) removal

CS sub(2) removal was obtained by coupling catalytic hyidation on bi-functional catalyst. On the hydrolysis active sites, CS sub(2) is hydrolyzed to H sub(2)S, while on the oxidation active sites, H sub(2)S is oxidized to elemental S or sulfuric acid deposited on the porous support. The above process can be expressed as follows: [MathML equation] H sub(2)S oxidation eliminates its prohibition on CS sub(2) hydrolysis so that the rate of coupling removal CS sub(2) is 5 times higher than that of CS sub(2) hydrolysis. The same active energy of hydrolysis and coupling reaction also indicates that H sub(2)S oxidation does not change the reaction mechanism of CS sub(2) hydrolysis. Temperature has obvious effect on the process while the mole ratio of O sub(2) concentration to CS sub(2) concentration (O/S) does not, especially in excess of 2.5. The formation of sulfuric acid on the catalyst surface poisons hydrolysis active sites and causes the decrease of left OH super(-1) concentration on the catalysts surface. Lower temperature is suggested for this bi-functional catalyst owing to the low yield ratio of S/SO sub(4) super(2-).