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Direct oxidation of H2 to H2O2 over Pd-based catalysts: Influence of oxidation state, support and metal additives

Paper ID Volume ID Publish Year Pages File Format Full-Text
44308 46014 2006 6 PDF Available
Title
Direct oxidation of H2 to H2O2 over Pd-based catalysts: Influence of oxidation state, support and metal additives
Abstract

The influence of oxidation state (reduced and oxidized), support (ZrO2, Ga2O3, CeO2, SiO2, H-β, ThO2, CeO2–ZrO2, BPO4 and Pd/Al2O3) and precious metal additives (Au, Pt, Rh and Ru) on the direct H2O2 synthesis has been investigated over Pd-based catalysts. For all the supports investigated herein, the oxidized Pd catalysts showed significantly superior H2O2 yields as compared to their reduced counterparts. The effect of the Pd oxidation state was found to be more important for determining the H2O2 yields than the particle size and surface area properties of the catalyst system. An excellent correlation was observed between the H2O2 selectivity and H2O2 decomposition activity of the oxidized Pd catalysts. The oxidized Pd catalysts showed almost an order of magnitude lower H2O2 decomposition activity than the reduced catalysts. The H2O2 yield in the H2 to H2O2 oxidation passed through a maximum with increase in the Au concentration. Although a similar effect was also observed in case of Pt, Au was found to be a superior promoter for the direct H2O2 synthesis process. Addition of Rh and Ru was found to be detrimental for the H2O2 yields; these results can be explained in terms of increased H2O2 decomposition activity and/or enhanced H2 to H2O reaction activity in their presence.

Keywords
H2O2; Direct synthesis; Decomposition; Pd catalysts; Metal additives; Oxidation state; Supports
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Direct oxidation of H2 to H2O2 over Pd-based catalysts: Influence of oxidation state, support and metal additives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 308, 10 July 2006, Pages 128–133
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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