Deposition of palladium by the hydrogen assisted on SBA-15 with a new precursor using supercritical carbon dioxide

Abstract

Preparation of SBA-15 supported palladium nanoparticles by H2-assisted chemical reduction of a new phenylic precursor dichloro(1,10-phenanthroline) palladium(II) with supercritical carbon dioxide deposition was studied in mild conditions. The solubility study of the precursor in supercritical carbon dioxide was measured under various pressure at 353K in order to optimize the operating parameters for the metal deposition study. The deposition experiments were performed under 17.2MPa pressure at 353K within 8h. It was found that homogeneous well-dispersed Pd nanoparticles on SBA-15 with a size average of 17.05±1.79nm determined with HR_TEM images. It was found that Pd nanoparticles deposited in the channel of the porous, into the pores and outer surface of the SBA-15 support. XRD and HR_TEM results showed that obtained Pd nanoparticles are far smaller than particles prepared by H2 reduction method in scCO2 in literature.