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Generation of hydrogen peroxide via the selective reduction of oxygen by hydrazine sulfate over Br-promoted Pd/Al2O3 catalyst in an aqueous medium at ambient conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
43623 45979 2007 8 PDF Available
Title
Generation of hydrogen peroxide via the selective reduction of oxygen by hydrazine sulfate over Br-promoted Pd/Al2O3 catalyst in an aqueous medium at ambient conditions
Abstract

The in situ generation of H2O2 via the selective reduction of O2 by hydrazine sulfate (in an aqueous medium) has been thoroughly investigated over the Br-promoted Pd(or PdO)/Al2O3 catalyst. The influence of the following factors have been addressed in this study: (a) Br concentration (in the reaction medium or incorporated in the catalyst); (b) reaction conditions (viz. reaction time, temperature); (c) concentrations of reducing agent and phosphoric acid in the reaction medium. Decomposition of N2H4 (from N2H4·H2SO4) and its reaction with H2O2 under similar reaction conditions (in the absence of O2) have also been studied. H2O2, which is an intermediate product of the O2 reduction, is involved in further consecutive reactions. It can be converted to water via its decomposition and/or reaction with the unconverted N2H4. In the presence of Br promoter, the later (reaction with unconverted N2H4) is more dominant. Both the consecutive reactions are drastically retarded in the presence of protons and Br promoter. A plausible reaction mechanism has been proposed for illustrating the role of the protons and Br promoter in the selective formation of H2O2 in the O2 reduction process.

Graphical abstractIn situ generation of H2O2 with high selectivity/yield can be accomplished by the reduction of molecular oxygen by the hydrazine from hydrazine sulfate over brominated Pd/Al2O3 catalyst in an acidic aqueous medium under or close to ambient conditions.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrogen peroxide; Hydrazine sulfate; Pd/Al2O3 catalyst; Brominated Pd/Al2O3 catalyst; Oxygen reduction; In situ H2O2 generation
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Generation of hydrogen peroxide via the selective reduction of oxygen by hydrazine sulfate over Br-promoted Pd/Al2O3 catalyst in an aqueous medium at ambient conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 202–209
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