Liquid-Phase Selective Hydrogenation of 1-Heptyne over Pd/TiO2 Catalyst Synthesized by One-Step Flame Spray Pyrolysis

Abstract

The Pd/TiO2 nanoparticles synthesized by one-step flame spray pyrolysis (FSP) with Pd loadings 0.5–10 wt% showed good catalytic performances in the liquid-phase selective hydrogenation of 1-heptyne. Higher selectivities to 1-heptene at complete conversion of 1-heptyne were obtained on the FSP-derived catalysts compared to the ones prepared by conventional impregnation of palladium on the FSP-synthesized and the commercial P-25 TiO2 supports. Based on the characterization results from X-ray diffraction (XRD), transmission electron microscopy (TEM), CO-pulse chemisorption, and X-ray photoelectron spectroscopy (XPS), the improved catalytic properties of Pd/TiO2 were attributed to a stronger interaction/an intimate contact between the very fine Pd particles and the TiO2 support obtained via one-step FSP synthesis. The very fine Pd particles confined to the TiO2 supports obtained by one-step flame spray pyrolysis (FSP) method showed high catalytic activity in the liquid-phase selective hydrogenation of 1-heptyne with high selectivity towards 1-heptene.