COMPENSATION EFFECT IN CATALYTIC HYDROLYSIS OF CARBONYL SULFIDE AT LOWER TEMPERATURE COMPENSATION EFFECT IN COS HYDROLYSIS

A series of catalysts impregnated with alkali metal oxides and alkali earth metal oxides for COS hydrolysis reaction was prepared. The activities of catalysts in lower temperature range (45-100-degrees-C) were investigated by means of microreactor-chromatograph. It was shown that the catalytic activity is closely related to the oxide and its content. Further, it was also observed that a compensation effect exists by studying the reaction rate constant (k) at various temperatures. That is, the activation energy (E) increases along with the increase of the pre-exponential factor (A). Both compensation effect parameter (K(o)) and energy distribution exponential factor (1/b) are closely related to the metal ionic radius (d(m)). K0 = 11.437-6.5189 d(m), ln(1/b) = ln 2.6382 + 0.039577 in K0. The isokinetic temperatures (T(s)) of all prepared catalysts were obtained. A possible explanation for the compensation effect in COS hydrolysis was given.