Oxidation of glycerol with H2O2 on Pb‐promoted Pd/γ‐Al2O3 catalysts

MARIA L. FAROPPA; JUAN J. MUSCI; MARIA E. CHIOSSO; CLAUDIA G. CAGGIANO; HERNÁN P. BIDEBERRIPE; JOSÉ L. GARCÍA FIERRO; GUILLERMO J. SIRI; MÓNICA L. CASELLA

Chinese Journal of catalysis

Elsevier B.V. and Science Press

Lugar: Dalian; Año: 2016 vol. 37 p. 1982 - 1990

1872-2067

A series of bimetallic Pd‐Pb catalysts with a constant Pd content of 1 wt% and Pb/Pd atomic ratio from 0 to 1.6 supported on γ‐Al2O3 were prepared and used for glycerol oxidation with H2O2 as the oxidizing agent at atmospheric pressure, 45 °C and pH = 11. The morphology and dispersion of the catalysts were characterized by scanning electron microscopy‐energy dispersive X‐ray spectroscopy (SEM‐EDX) and transmission electron microscopy (TEM). The presence of an alloy phase in the bimetallic catalyst was detected by X‐ray photoelectron spectroscopy (XPS). Glycerol conversion obtained with the monometallic Pd catalyst was 19%, which was increased to 100% with the addition of Pb. The four bimetallic PdPb catalysts were able to oxidize glycerol to dihydroxyacetone (DIHA) and the selectivity to DIHA reached 59%, 58%, 34% and 25% for PdPb0.25, PdPb0.50, PdPb1.00 and PdPb1.60 catalysts, respectively.