Hydroxyl radical formation during methane oxidation and water decomposition on Pt measured by laser-induced fluorescence

Journal Article · Thu Aug 08 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100169a006· OSTI ID:7273395

Mooney, C E; Anderson, L C; Lunsford, J H ^[1]

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1. Texas A and M Univ., College Station (United States)

The hydroxyl radical is one of the most important radicals involved in catalyzed chemical reaction and combustion processes. Laser-induced fluorescence (LIF) was used to monitor the formation and desorption of OH{sup {sm bullet}} radicals over a Pt wire during the catalyzed oxidation of methane. As in the pt-catalyzed oxidation of hydrogen, the apparent activation energy of OH{sup {sm bullet}} desorption, E{sub a}, depends strongly on the fuel-to-oxygen ratio, varying from {approximately}33 kcal/mol at high O{sub 2}/CHH{sub 4} values to {approximately}56 kcal/mol at low O{sub 2}/CH{sub 4} ratios. The reaction of surface oxygen with D{sub 2} during the decomposition of H{sub 2}O on Pt shows that the surface oxygen concentration influences E{sub a} for OH{sup {sm bullet}} desorption on platinum.

• OSTI ID: 7273395
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Journal Issue: 16 Vol. 95:16; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACTIVATION ENERGY
ALKANES
CATALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DESORPTION
DEUTERIUM
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROXYL RADICALS
INFORMATION
ISOTOPES
LABELLING
LASER SPECTROSCOPY
LIGHT NUCLEI
METALS
METHANE
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RADICALS
SORPTION
SPECTROSCOPY
STABLE ISOTOPES
SYNTHESIS
TRANSITION ELEMENTS
WATER