Imidazolium-based ionic liquid silica xerogel as catalyst to transform CO2 into cyclic carbonate

Abstract

In this work silica xerogel samples containing different imidazolium ILs (EMIM-CF 3 SO 3 , EMIM-MSO 3 , BMIM-Cl, MBMIM-TF 2 N, BMIM-TF 2 N and EMIM-TF 2 N) were synthesized, characterized and used as catalyst in cyclic carbonate synthesis. ILs mass percentage was varied from 5% to 25%. The effect fostered by the ILs mass variation in the synthesis of silica xerogel was observed both in the materials characterization as well as in the performance of these materials as solid catalysts in the cyclic carbonate synthesis from the cycloaddition reaction of CO 2 with propylene epoxide. The obtained silica xerogel samples (SXs) were characterized by FTIR, RAMAN, TGA, SEM and TEM. The selectivity of the cycloaddition reaction was analyzed by GC and 1 H and 13 C NMR. The best results were obtained for SX-EMIM MSO 3 (20% of IL) and SX-BMIM Cl (15% of IL) with propylene carbonate yields of 91.4% and 83.4% and selectivities >99% and 97.4% respectively.

Performance of supported metal catalysts in the dimethyl carbonate production by direct synthesis using CO2 and methanol

“…The calculation to determine the actual impregnation (%) of the metals in the activated carbon sample was carried out according to Eq. 1, where the difference among the metal impregnated carbon (ACX) sample weight and the weight of the pure carbon (AC) sample in the temperature range of 25-800 • C gives the percentage of impregnation [43].…”

A novel zirconium-based metal–organic framework covalently modified by methyl pyridinium bromide for mild and co-catalyst free conversion of CO2 to cyclic carbonates

“…[13][14][15][16][17] A variety of homogeneous materials such as quaternary ammonium salts, ionic liquids and Schiff bases have been developed. 18,19 However, high pressure and high temperature are usually needed for these catalysts, resulting in high energy consuming processes. Moreover, they have obvious disadvantages such as separation and recyclability of the catalysts and purification of the final products.…”

Material Synthesis, Spectral, Optical and Antimicrobial Activity of Imidazolium Based Aldehydic Ionic Liquids: 1–Ethyl-3-methyl-2-(2-oxo-ethyl)-3H-imidazol-1-ium bromide (I) and 1-butyl-3-methyl-2-(2-oxo-ethyl)-3H-imidazol-1-ium chloride (II)

“…It is frequently employed in industrial processes like acid pickling and acid descaling [8,9]. Due to the intrinsic magnetic, spectroscopic, and electrochemical characteristics of ionic liquids that depend on the confined metal ions, synthesized and characterized metals containing ionic liquids have high electrocatalytic activity [10,11]. The zinc (II) combination with imidazolium ionic liquid tag demonstrated effective DNA breakage and antifungal and antibacterial activity against gram-positive bacteria [4,11,12].…”