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Kinetics of hydrogen peroxide reduction by hydrogen in a microreactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
43072 45954 2009 8 PDF Available
Title
Kinetics of hydrogen peroxide reduction by hydrogen in a microreactor
Abstract

An overall rate expression for the formation of hydrogen peroxide by direct combination (DC) of H2 and O2 is required for a rational design of a microreactor and for the determination of the optimum operating conditions for this process. Since the formation of H2O2 by the DC process involves four simultaneous reactions (synthesis of H2O2, synthesis of water, decomposition of H2O2, and reduction of H2O2 by H2), the overall rate expression must take into account the rate expressions of these reactions. In this work, we investigate the mechanism and the rate expression for reduction of H2O2 by H2. Kinetic experiments were carried out to measure the effects of H2O2 concentration and H2 partial pressure on the rate of reaction. The reaction was shown to be free of mass transfer limitations at the conditions of the kinetic experiments. A Langmuir-Hinshelwood mechanism for the reduction of H2O2 over Pd/SiO2 catalyst was adopted since the simple power-law expression could not explain the obtained kinetic data. A rate expression based on this mechanism was shown to accurately correlate experimental data over a wide range of H2O2 concentration, H2 partial pressure, and temperature.

Graphical abstractThe knowledge of kinetics of hydrogen peroxide reduction by hydrogen is required as a part of complete kinetics of H2O2 formation by direct combination of hydrogen and oxygen, which involves synthesis, reduction, and decomposition of H2O2, as well as synthesis of water. A mechanism of hydrogen peroxide reduction was proposed. A rate expression based on this mechanism was shown to accurately correlate experimental data over wide ranges of reactant concentrations and temperature.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrogen peroxide; Direct synthesis; Microreactor; Palladium catalyst; Reduction; Sulfuric acid; Kinetics; Catalysis; Multiphase reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 353, Issue 1, 31 January 2009, Pages 9–16
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