Methane oxidation over Pt on. gamma. -alumina: Kinetics and structure sensitivity
- Ford Motor Co., Dearborn, MI (USA)
A recirculation batch reactor and a mass spectrometer were used to measure methane oxidation rates, free of mass-transfer limitations, over Pt. Samples included platinum on {gamma}-alumina in the range from 0.03 to 30 wt% and Pt black. The reaction is described by first-order kinetics with respect to methane and is independent of oxygen pressure under the experimental conditions chosen. A maximum in turnover frequency and a decrease in apparent activation energy with increasing Pt concentration are found. Calculations of a reaction site density, based on theoretical and empirical kinetics, are inconsistent with an Eley-Rideal reaction mechanism. The reaction is possibly rate controlled by the dissociation of methane.
- OSTI ID:
- 7052880
- Journal Information:
- Langmuir; (USA), Journal Name: Langmuir; (USA) Vol. 5:6; ISSN LANGD; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKANES
CATALYSTS
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
METHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
PLATINUM
PLATINUM METALS
STRUCTURE-ACTIVITY RELATIONSHIPS
TRANSITION ELEMENTS