Mechanistic and kinetic studies of the elementary processes in catalytic combustion of methane. Final report, September 1, 1981-August 31, 1984
The reactions of ethylene, acetylene, and diazomethane were studied on a clean, H-covered, and O-covered Pt(111) surface. The results were compared among each other, and with those of azomethane. On a clean surface, adsorbed ethylene, acetylene, diazomethane, and azomethane decomposed by breaking C-H, C-C, C-N, and N=N bonds. Dehydrogenation is the dominant reaction for all the species. On a H-covered surface, hydrogenation of the unsaturated bonds is the major reaction, except for azomethane the N=N bond of which breaks readily on adsorption. The production of methane is used as an indication that diazomethane dissociates into CH/sub 2/ and N/sub 2/ on adsorption. On an O-covered surface, oxidation to CO, CO/sub 2/, and H/sub 2/O and decomposition are the major reactions. The oxidation pathways of adsorbed acetylene, ethylene, and methylene share a common feature that an intermediate of a carbon-hydrogen stoichiometry of CH is involved. The oxidation reactions take place at the perimeter of the adsorbed atomic oxygen islands.
- Research Organization:
- Northwestern Univ., Evanston, IL (USA)
- OSTI ID:
- 5502474
- Report Number(s):
- PB-85-188308/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
034000* -- Natural Gas-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ADSORPTION
ALKANES
ALKENES
ALKYNES
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL BONDS
CHEMICAL REACTIONS
COMBUSTION
ELEMENTS
ETHYLENE
HYDROCARBONS
KINETICS
METALS
METHANE
ORGANIC COMPOUNDS
OXIDATION
PLATINUM
PLATINUM METALS
REACTION KINETICS
SORPTION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS