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Direct oxidation of H2 to H2O2 over Pd/Ga2O3 catalyst under ambient conditions: Influence of halide ions added to the catalyst or reaction medium

Paper ID Volume ID Publish Year Pages File Format Full-Text
44326 46015 2007 9 PDF Available
Title
Direct oxidation of H2 to H2O2 over Pd/Ga2O3 catalyst under ambient conditions: Influence of halide ions added to the catalyst or reaction medium
Abstract

The formation of H2O2 from H2 and O2 and H2O2 decomposition/hydrogenation have been investigated in an acidic aqueous reaction medium over halide-assisted Pd/Ga2O3 catalyst system. The halide ions were introduced in the catalytic system by directly adding the halide ions to the reaction medium or by indirectly through the catalyst. The H2O2 formation selectivity was found to be influenced significantly with the addition of halide ions to the catalytic system. The H2O2 formation and H2O2 decomposition/hydrogenation studies over halide-modified Pd/Ga2O3 catalysts (pretreated under different gaseous atmosphere viz. air and nitrogen) revealed that bulk Pd oxidation state and nature of halide ions incorporated in the catalyst cooperatively promote the selective H2O2 formation. The decomposition and hydrogenation H2O2 on the Pd/Ga2O3 catalyst were also found strongly depend upon the nature of the halide ions introduced in the catalytic system. The selectivity for the conversion of H2 to H2O2 was enhanced markedly due to the presence of Br− ions in the catalytic system, irrespective of the bulk palladium oxidation state (PdO or Pd0) in the catalyst. The beneficial role of Br− ions is attributed to the inhibition of the parallel H2 to water oxidation and the consecutive H2O2 decomposition and hydrogenation reactions over the catalyst.

Graphical abstractH2O2 yield/selectivity in the direct H2O2 synthesis over Pd/Ga2O3 catalyst is markedly increased with the addition of Br− ions (at an optimum concentration) to the catalyst or reaction medium. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Selective H2 oxidation; Pd/Ga2O3 catalyst; H2O2 decomposition; H2O2 hydrogenation; Bromide promoter
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Direct oxidation of H2 to H2O2 over Pd/Ga2O3 catalyst under ambient conditions: Influence of halide ions added to the catalyst or reaction medium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 326, Issue 1, 30 June 2007, Pages 28–36
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