常温羰基硫水解催化剂的制备及水解性能

Preparation and Properties of Catalyst for Carbonyl Sulfur Hydrolysis at Ambient Temperature

以氧化铝为载体,浸渍不同的碱金属和过渡金属制备了羰基硫(COS)水解催化剂。考察了载体类型、碱金属种类、过渡金属种类对催化剂水解性能的影响。结果表明:大孔容、大孔径的氧化铝载体制备的催化剂具有较优的水解性能,碱金属原子半径越大对应氧化物的碱性越强,因而碱金属K负载的催化剂比Na负载的具有更优的催化COS水解性能。该催化剂(Y-K)再由过渡金属Zn负载后,催化剂(Y-ZnK)的弱碱中心进一步增加,其催化COS水解的活性和稳定性更优。常温催化COS水解反应过程中,体系中的水含量对水解反应结果的影响很大,H_(2)O与COS物质的量比为2:1~8:1较佳,少量HS和CO_(2)的存在对COS水解反应没有明显影响。

The catalysts for carbonyl sulfur(COS) hydrolysis were prepared by impregnating different alkali metals and transition metals with alumina as support. The effects of support type, alkali metal type and transition metal type on COS hydrolysis performance over the catalysts were investigated. The results showed that the alumina support with large pore volume and large pore size exhibited the best performance for COS hydrolysis. Compared with alkali metal Na, the catalyst supported by K showed better catalytic performance for COS hydrolysis, because the alkalinity of its oxide was stronger when the atomic radius of the alkali metal was larger. After the catalyst supported by K was again loaded with the transition metal Zn,the weak base center of this catalyst(Y-ZnK) increased and the catalytic activity and stability of Y-ZnK for COS hydrolysis exhibited better. For the system of COS hydrolysis at ambient temperature, H_(2)O content influenced greatly on the results of COS hydrolysis, the better molar ratio of H_(2)O to COS was 2:1-8:1. There was no obvious effect on COS hydrolysis when a small amount of HS and CO_(2) presented in the system.