Journal
CATALYSIS LETTERS
Volume 99, Issue 3-4, Pages 181-185Publisher
SPRINGER
DOI: 10.1007/s10562-005-2114-8
Keywords
oxidation of polyols; sorbitol oxidation; bimetallic catalyst; gold/palladium; gold/platinum
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Monometallic Au, Pt and Pd on carbon catalysts show poor activity in the liquid phase oxidation of D-sorbitol to gluconic/gulonic acids. However, by using bimetallic based catalysts (Au-Pt or Au-Pd) a great enhancement in the activity has been observed with respect to all the monometallic catalysts tested probably due to a synergetic effect between Au and Pt or Pd. In fact physical mixture of monometallic catalysts presented poor activity. Bimetallic showed a resistance to poisoning by dioxygen and by reaction products as high as gold monometallic catalyst, but also an improved selectivity toward monooxidation with respect to monometallic.
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