Key words: adsorption, palladium hexafluoroacetylacetonate, hypercrosslinked polystyrene, aluminum oxide, supercritical fluid
The paper discusses the adsorption of palladium hexafluoroacetylacetonate (Pd(hfa)2) onto porous carriers (γ-Al2O3 and hypercrosslinked polystyrene) in supercritical CO2 to obtain supported palladium catalysts. The transition conditions of the Pd(hfa 2/CO2 system into the single-phase region have been studied. It is shown that due to the sufficiently high solubility of the palladium precursor in CO2, its deposition can be carried out at relatively low pressures in the system (- 8,5 MPa). The adsorption of Pd(hfa)2 on chosen carriers can be well characterized by the Langmuir equation. The system pressure increase under isothermal conditions negatively affects the amount of adsorbed precursor, due to the competitive CO2 adsorption and the distribution shift in the system. The system temperature increase under isochoric conditions leads to an increase in the adsorption limit.
doi:10.34984/SCFTP.2023.19.2.003