Reusable and Efficient PS-Supported Acidic Ionic Liquid Catalyst for Mononitration of Toluene
A polystyrene-supported 1-(propyl-3-sulfonate)-3-methy-imidazolium hydrosulfate acidic ionic liquid (PS-[SO3H-PMIM][HSO4]) catalyst was prepared by grafting and characterized by FT-IR, SEM/TEM, elements analysis, TG/DSC and acid base titration. It exhibited higher catalytic activity and improved para-selectivity than its homogenous counterpart for the nitration of toluene with 68% nitric acid. The catalytic activity of this catalyst decreased slightly after fifth runs in the synthesis of nitrotoluene.
Jimmy (C.M.) Kao, Wen-Pei Sung and Ran Chen
L. X. Li et al., "Reusable and Efficient PS-Supported Acidic Ionic Liquid Catalyst for Mononitration of Toluene", Advanced Materials Research, Vols. 581-582, pp. 252-256, 2012