Magnetic organic-silica hybrid supported Pt nanoparticles for carbon sequestration reaction

Abstract

We revealed a new protocol to support Pt nanoparticles on magnetic ionic liquid functionalized organosilica nanoparticle matrix. The proposed catalyst system was synthesized by sol–gel condensation method, where two silica precursors [tetraethyl orthosilicate (TEOS) and bis-silylated ionic liquid monomer] were used to carry hydrophobic magnetic nanoparticles. The Pt metal was supported on the skeleton of magnetic organosilica hybrid nanoparticles by adsorbing platinum salt (Na2PtCl4) (replaced by ion exchange method). Furthermore, sodium borohydride was used to reduce platinum salt to Pt NPs. The synthesized catalytic system was used for CO2 hydrogenation reaction under high-pressure reaction condition. An external magnetic field was used to informally recover the catalyst and further recycled for three runs (without ionic liquid medium). Task-specific ionic liquids were also manipulated as a reaction medium not only to capture the CO2 gas but also to improve the reaction in a more precise manner. Desired results were attained while using 1,3-di (N, N-dimethylaminoethyl)-2-methylimidazolium nonafluorobutanesulfonate ([DAMI][CF3CF2CF2CF2SO3]) task-specific ionic liquid and we isolated the formic acid in good TON/TOF value. We easily reused the catalytic system up to 8 runs without decreasing the performance and stability of the catalytic system.