Direct synthesis of H2O2 from H2 and O2 over Pd-Pt/SiO2 bimetallic catalysts in a H2SO4/ethanol system

Qingsheng Liu, J. Chris Bauer, Raymond E. Schaak, Jack H. Lunsford

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The effect of adding Pt to a Pd/SiO2 catalyst for the direct formation of H2O2 in ethanol that contains H2SO4 and halide ions (Cl- or Br-) has been investigated. The addition of only 5 atom% Pt to a catalyst that contained 0.5 wt.% Pd resulted in a 2.5-fold increase in the rate of peroxide formation with only a small decrease in selectivity. The addition of substantially more Pt caused a decrease in the selectivity; whereas, the peroxide formation rate depended on the amount of Pt, as well as the type and amount of the halide. The Pt had no significant effect on the particle size distribution of the supported bimetallic catalysts. The positive role of Pt on the rate of H2O2 formation can be understood in terms of an electronic modification through which Pt partially reverses the negative influence that the halides have on hydrogen activation.

Original languageEnglish (US)
Pages (from-to)130-136
Number of pages7
JournalApplied Catalysis A: General
Volume339
Issue number2
DOIs
StatePublished - May 1 2008

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Peroxides
Ethanol
Catalysts
Catalyst supports
Particle size analysis
Hydrogen
Chemical activation
Ions
Atoms

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

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title = "Direct synthesis of H2O2 from H2 and O2 over Pd-Pt/SiO2 bimetallic catalysts in a H2SO4/ethanol system",
abstract = "The effect of adding Pt to a Pd/SiO2 catalyst for the direct formation of H2O2 in ethanol that contains H2SO4 and halide ions (Cl- or Br-) has been investigated. The addition of only 5 atom{\%} Pt to a catalyst that contained 0.5 wt.{\%} Pd resulted in a 2.5-fold increase in the rate of peroxide formation with only a small decrease in selectivity. The addition of substantially more Pt caused a decrease in the selectivity; whereas, the peroxide formation rate depended on the amount of Pt, as well as the type and amount of the halide. The Pt had no significant effect on the particle size distribution of the supported bimetallic catalysts. The positive role of Pt on the rate of H2O2 formation can be understood in terms of an electronic modification through which Pt partially reverses the negative influence that the halides have on hydrogen activation.",
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Direct synthesis of H2O2 from H2 and O2 over Pd-Pt/SiO2 bimetallic catalysts in a H2SO4/ethanol system. / Liu, Qingsheng; Bauer, J. Chris; Schaak, Raymond E.; Lunsford, Jack H.

In: Applied Catalysis A: General, Vol. 339, No. 2, 01.05.2008, p. 130-136.

Research output: Contribution to journalArticle

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