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

Paper ID Volume ID Publish Year Pages File Format Full-Text
43307 45963 2008 7 PDF Available
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.

Graphical abstractThe addition of only 5 atom% Pt to a Pd/SiO2 catalyst resulted in a significant increase in the rate of H2O2 formation with only a small decrease in selectivity. The direct formation of the peroxide from H2 and O2 requires the presence of halides ions (Cl− or Br−), which inhibit both the selective and nonselective oxidation of H2. The Pt is believed to partially reverse the effect that the halides have on hydrogen activation.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrogen peroxide; Palladium/silica; Pd–Pt catalyst; Platinum; Promotional effect; Halides
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Direct synthesis of H2O2 from H2 and O2 over Pd–Pt/SiO2 bimetallic catalysts in a H2SO4/ethanol system
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 339, Issue 2, 1 May 2008, Pages 130–136
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us