Journal
TOPICS IN CATALYSIS
Volume 55, Issue 1-2, Pages 24-32Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-012-9777-3
Keywords
Hydroxymethylfurfural; Glycerol; Glyceric acid; Tartronic acid; Furandicarboxylic acid; Gold catalyst; Oxidation
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Funding
- United States Department of Energy [DE-FG02-95ER14549]
- National Science Foundation [OISE 0730277, EEC-0813570]
- U.S. Department of Energy (DOE) [DE-FG02-95ER14549] Funding Source: U.S. Department of Energy (DOE)
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The selective oxidation of glycerol and 5-hydroxymethylfurfural (HMF) to diacids over supported gold catalysts (Au/C and Au/TiO2) in liquid water at mild temperatures was a strong function of the added base such as NaOH. Use of hydrotalcite as a solid base in place of NaOH in the HMF reaction medium facilitated the production of diacid over Au/TiO2, but extensive leaching of magnesium suggested that hydrotalcite was consumed stoichiometrically in the reaction. Production of diacids from glycerol oxidation over supported Au catalysts was promoted by operating in a continuous flow reactor and by increasing the catalyst loading in a semi-batch reactor. Trace inhibitors formed by conversion of the product monoacid are proposed to account for the generally low selectivity to diacids over gold catalysts.
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