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Oxidation of glycerol using gold-palladium alloy-supported nanocrystals

Dimitratos, N; Lopez-Sanchez, JA; Anthonykutty, JM; Brett, G; Carley, AF; Tiruvalam, RC; ... Hutchings, GJ; + view all (2009) Oxidation of glycerol using gold-palladium alloy-supported nanocrystals. PHYS CHEM CHEM PHYS , 11 (25) 4952 - 4961. 10.1039/b904317a.

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Abstract

The use of bio-renewable resources for the generation of materials and chemicals continues to attract significant research attention. Glycerol, a by-product from biodiesel manufacture, is a highly functionalised renewable raw material, and in this paper the oxidation of glycerol in the presence of base using supported gold, palladium and gold-palladium alloys is described and discussed. Two supports, TiO2 and carbon, and two preparation methods, wet impregnation and sol-immobilisation, are compared and contrasted. For the monometallic catalysts prepared by impregnation similar activities are observed for Au and Pd, but the carbon-supported monometallic catalysts are more active than those on TiO2. Glycerate is the major product and lesser amounts of tartronate, glycolate, oxalate and formate are observed, suggesting a sequential oxidation pathway. Combining the gold and palladium as supported alloy nanocrystals leads to a significant enhancement in catalyst activity and the TiO2-supported catalysts are significantly more active for the impregnated catalysts. The use of a sol-immobilisation preparation method as compared to impregnation leads to the highest activity alloy catalysts and the origins of these activity trends are discussed.

Type:Article
Title:Oxidation of glycerol using gold-palladium alloy-supported nanocrystals
DOI:10.1039/b904317a
Keywords:LIQUID-PHASE OXIDATION, AU-PD CATALYSTS, SOL IMMOBILIZATION TECHNIQUE, SELECTIVE OXIDATION, HYDROGEN-PEROXIDE, CARBON-MONOXIDE, CHEMICAL-SYNTHESIS, PARTICLE-SIZE, CO OXIDATION, FUEL-CELLS
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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