Preparation and SO₂ Sorption/Desorption Behavior of an Ionic Liquid Supported on Porous Silica Particles

Abstract

The ionic liquid 1,1,3,3-tetramethylguanidinium lactate (TMGL) was supported onto porous silica particles via a facile impregnation-vaporization method. The TMGL-supported particles gave high porosity and large specific surface area. The SO 2 sorption/desorption properties of the silica-supported TMGL (TMGL-SiO 2 ) were evaluated, and high SO 2 sorption capacity and rate were achieved. Its capacity reached 0.6 g SO 2 /g TMGL in 15-30 min with pure SO 2 gas and 0.15 g SO 2 /g TMGL in 17 h with a N 2 /SO 2 mixture gas that contained 2160 ppm SO 2 . The SO 2 concentration was reduced to 12.6 ppm after sorption. The TMGL-SiO 2 system could be reused for many sorption/desorption cycles without change in its capacity. It was also characterized by good mechanical strength and thermal stability at temperature up to 130°C. The SO 2 sorbent system appears to be useful in gas desulfurization.

Absorption of Sulfur Dioxide in Ionic Liquid Supported on Porous Silica Particles

“…TMGL/SiO2 with different immobilization ratio was prepared through the impregnation-vaporization process [10] , and the TMGL/SiO2 ratio x/1 was expressed as TMGL/SiO2-x/1, equal to the TMGL/SiO2 feed ratio x/1. TMGL/SiO2-x/1 and TMGL were characterized by Thermal Gravimetric Analyzer (TGA).…”

“…Unfortunately, their internal pore structures would be collapsed or mostly lost after many cycles of SO2 sorption. Subsequently, Li et al [10] immobilized TMGL to porous silica (SiO2) particles, which provided large gas-solid interface. They reported that it is an effective way to improve the absorption rate and capacity (1.9 mol SO2/mol TMGL with pure SO2) of TMGL.…”

Study of SO<sub>2</sub> Adsorption on Porous SiO<sub>2</sub> Particles Using a Micro-Reactor System

“…In addition, the conveying of viscose IL for cyclic operation between absorption and regeneration may present another practical problem. In order to solve these problems, Li and Zhu and their coworkers proposed immobilization of ILs on solid materials by co-polymerization [27] and impregnation-vaporization methods [28]. They found that simply impregnating TMGL on porous silica particles gives a material maintaining the porous structure, large surface area and good mechanical properties of silica while taking the advantages of high SO 2 capacity of IL [28].…”

“…In order to solve these problems, Li and Zhu and their coworkers proposed immobilization of ILs on solid materials by co-polymerization [27] and impregnation-vaporization methods [28]. They found that simply impregnating TMGL on porous silica particles gives a material maintaining the porous structure, large surface area and good mechanical properties of silica while taking the advantages of high SO 2 capacity of IL [28]. Thereafter, various supported IL materials have been developed [29].…”

Interação de SO2 com espécies iônicas e moleculares: espectrocopia raman e cálculos teóricos

“…[24][25][26][27] Uma grande parte desse interesse deriva, sem dúvida, do enorme desafio ambiental representado pelas concentrações crescentes de SO 2 na atmosfera, em grande parte decorrentes da queima de combustíveis fósseis. As estimativas da última década colocam a emissão de SO 2 na atmosfera na escala de 300 milhões de toneladas/ano no mundo.…”