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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 570878.0, Fritz-Haber-Institut / Inorganic Chemistry
Catalytic Partial Oxidation of Methane on Autothermally Operated Pt Catalysts: Reaction Pathways, Zoning Effects and Impact of Mass and Heat Transport
Authors:Korup, Oliver; Geske, Michael; Mavlyankariev, Sardor; Schlögl, Robert; Horn, Raimund
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Prep. Pap.-Am. Chem. Soc., Div. Fuel Chem.
Journal Abbrev.:Prep. Pap.-Am. Chem. Soc., Div. Fuel Chem.
Volume (in Journal):55
Issue / Number:2
Start Page:149
End Page:150
Name of Conference/Meeting:240th ACS National Meeting
Place of Conference/Meeting:Boston, Massachusetts [USA]
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Heterogeneously catalyzed gas phase oxidation reactions are often characterized by reaction temperatures of several hundred degrees centigrade. In particular for the oxidation of small alkanes, high temperatures are common either to activate the alkane or as a result from rapid heat production after reaction light-off. An example is the catalytic partial oxidation (CPO) of methane to synthesis gas on platinum at temperatures above 800 °C. Characteristic for high temperature oxidation catalysis is the strong influence of mass and heat transport as well as gas phase reactions above the catalyst surface. Because the number of intermolecular collisions increases with pressure, gas phase chemistry becomes generally more important at elevated pressures. Consequently, product yields and selectivities in high temperature oxidation catalysis are often the result of a complex network of reactions at the catalyst surface and in the surrounding gas phase which are coupled in a non-linear way by heat transport, mass transport and exchange of reactive intermediates (1). In a conventional catalytic reactor measurement inlet and outlet streams to and from the reactor are analyzed respectively. The reactor itself is usually treated as a black box and the pathways via which reactants are transformed into products remain hidden. Spatially resolved species, gas and surface temperature profiles measured through a catalyst bed under in-situ high temperature/high pressure conditions reveal details about the reaction pathways, e.g. zoning in the catalyst bed, the impact of transport limitations and the influence of gas phase chemistry, especially at elevated pressure.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
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