Synthesis of Heterogeneous Catalysts by Laser Ablation of Metallic Palladium with Deposition on Alumina in Supercritical Carbon Dioxide

Abstract

An experimental setup is designed and assembled to produce deposited heterogeneous catalysts by laser ablation of a metal target in the presence of various carriers in supercritical carbon dioxide (SC-CO2). The conditions of pulsed laser exposure (wavelength, frequency, and time), parameters of an SC-CO2 medium (pressure and temperature), and configuration of the experimental setup (laser, target, carrier, and visual and optical control components) are determined. A composite comprised of Al2O3 with Pd particles is prepared in this setup by the laser ablation of metal palladium with deposition onto γ-alumina in an SC-CO2 medium. Studying the synthesized composite as a catalyst in the liquid-phase hydrogenation of diphenylacetylene shows its high level of activity (TOF = 1.45 s–1) and high selectivity in the hydrogenation of one bond of the triple bond.