Carbonyl sulfide adsorption of molecular sieves loaded with amine functional ionic liquids

Abstract

The SBA-15 molecular sieve carrier with large specific surface area and pore volume, high temperature resistance and acid and alkali resistance was successfully synthesized by the method of hydrothermal synthesis. Then, ionic liquid is loaded on the surface and pores of the carrier by the impregnation method, so that it can be combined with the acid-base COS, thereby enhancing the adsorption effect and adsorption selectivity. Effects of three ionic liquids: 1-ethyl-3-methylimidazolium glycinate, 1-butyl-3-methylimidazolium glycinate and 1–(2-Aminoethyl)3-methylimidazolium bromide on the COS adsorption properties were discussed at different adsorption temperatures and loading concentrations. Among these mesoporous molecular sieves immobilized ionic liquids, the result from COS adsorption shows that the specific surface area of SBA-15 molecular sieve impregnated with 0.9 g·mL−1 [C2mim][Gly] (SBA-15-C29.0) decreased from 902 m2·g−1 to SBA-15–27 m2·g−1. And its COS breakthrough adsorption capacity can reach 11.38 mg·g−1. It can concluded that [C2mim][Gly] is helpful to increase the adsorption capacity.