Effect of the Nature of Silica on the Catalytic Properties of Immobilized Alkylimidazolium Chloroferrate in the Oxidation of Heterocyclic Compounds

Abstract The paper describes results of studying the composition, structure, and catalytic properties of heterogeneous hybrid composites composed of an imidazole ionic liquid and iron(III) chloride supported on silicas of various structures, namely, silica gel, synthetic opal, and mesoporous SiO2 synthesized by treating sodium borosilicate glass. The composition and structure of the hybrid materials are determined by adsorption methods, X-ray fluorescence (XRF) analysis, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The catalytic properties of the materials in model oxidation catalysis reactions are determined. The results show that composites based on silica gel and opal exhibit high activity in the hydrogen peroxide-assisted oxidation of sulfur- and nitrogen-containing compounds.