Overall kinetics of hydrogen peroxide formation by direct combination of H2 and O2 in a microreactor

Abstract Direct combination (DC) of hydrogen and oxygen over a heterogeneous catalyst in a microreactor is a novel method of producing hydrogen peroxide with significant economic advantages over the currently dominant anthraquinone autoxidation method. A kinetic rate expression for this reaction is required for design and modeling of a microreactor for the DC process. Since the formation of H 2 O 2 by the DC process involves four simultaneous reactions (synthesis of H 2 O 2 , synthesis of water, reduction of H 2 O 2 by H 2 and decomposition of H 2 O 2 ), the overall rate expression must take into account each of these reactions. In this work, we describe a reactor model that involves the four component reactions as well as mass transfer effects. The model is verified by comparing the predicted reactor performance with experimental data. In addition to providing a tool for reactor design, the model also confirms important assumptions regarding the mechanism of DC reaction.

[1]  C. Samanta,et al.  Role of chloride or bromide anions and protons for promoting the selective oxidation of H2 by O2 to H2O2 over supported Pd catalysts in an aqueous medium , 2006 .

[2]  K. Jensen,et al.  Microfabricated Multiphase Reactors for the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen , 2007 .

[3]  C. Samanta,et al.  Direct formation of H2O2 from H2 and O2 and decomposition/hydrogenation of H2O2 in aqueous acidic reaction medium over halide-containing Pd/SiO2 catalytic system , 2007 .

[4]  Soon-Heung Chang,et al.  Performance Test of the Quenching Meshes for Hydrogen Control , 2003 .

[5]  Adeniyi Lawal,et al.  Kinetics and Mechanism of Decomposition of Hydrogen Peroxide over Pd/SiO2 Catalyst , 2008 .

[6]  Götz Veser,et al.  Experimental and theoretical investigation of H2 oxidation in a high-temperature catalytic microreactor , 2001 .

[7]  Freek Kapteijn,et al.  Mass transfer characteristics of three-phase monolith reactors , 2001 .

[8]  J. Lunsford,et al.  The direct formation of H2O2 from H2 and O2 over colloidal palladium , 2003 .

[9]  Adeniyi Lawal,et al.  Kinetics of hydrogen peroxide synthesis by direct combination of H2 and O2 in a microreactor , 2007 .

[10]  F. Pinna,et al.  Direct synthesis of hydrogen peroxide on zirconia-supported catalysts under mild conditions , 2006 .

[11]  G. Hutchings,et al.  Direct synthesis of hydrogen peroxide from H2 and O2 using Pd and Au catalysts , 2003 .

[12]  S. Jaenicke,et al.  Evaluation of multiphase microreactors for the direct formation of hydrogen peroxide , 2007 .

[13]  Francesco Pinna,et al.  Direct synthesis of H2O2 on monometallic and bimetallic catalytic membranes using methanol as reaction medium , 2006 .

[14]  K. Jensen,et al.  Flow distribution and ozonolysis in gas-liquid multichannel microreactors , 2006 .

[15]  A. Lawal,et al.  Kinetics of hydrogen peroxide reduction by hydrogen in a microreactor , 2009 .

[16]  T. Choudhary,et al.  Direct oxidation of H2 to H2O2 over Pd-based catalysts: Influence of oxidation state, support and metal additives , 2006 .

[17]  Klavs F. Jensen,et al.  Microfabricated multiphase packed-bed reactors : Characterization of mass transfer and reactions , 2001 .

[18]  A. Lawal,et al.  Comparison of performance of microreactor and semi-batch reactor for catalytic hydrogenation of o-nitroanisole , 2007 .

[19]  R. Burch,et al.  An investigation of alternative catalytic approaches for the direct synthesis of hydrogen peroxide from hydrogen and oxygen , 2003 .

[20]  C. Samanta,et al.  Decomposition and/or hydrogenation of hydrogen peroxide over Pd/Al2O3 catalyst in aqueous medium: Factors affecting the rate of H2O2 destruction in presence of hydrogen , 2007 .

[21]  Ferdi Schüth,et al.  The Controlled Oxidation of Hydrogen from an Explosive Mixture of Gases Using a Microstructured Reactor/Heat Exchanger and Pt/Al2O3 Catalyst , 2000 .

[22]  Jacob A. Moulijn,et al.  Modeling of monolithic and trickle-bed reactors for the hydrogenation of styrene , 2003 .

[23]  J. Lunsford,et al.  A mechanistic study of H2O2 and H2O formation from H2 and O2 catalyzed by palladium in an aqueous medium , 2004 .

[24]  J. Fierro,et al.  Hydrogen peroxide synthesis: an outlook beyond the anthraquinone process. , 2006, Angewandte Chemie.

[25]  M. Vannice.  Kinetics of Catalytic Reactions , 2005 .