Mechanistic and kinetic studies of the elementary processes in catalytic combustion of methane. Annual report, 1 Sep 82-31 Aug 83

Technical Report · Sat Oct 01 04:00:00 EDT 1983

OSTI ID:6842451

Kung, H H; Butt, J B

The reactions of ethylene and acetylene on a Pt(111) surface were studied with temperature programmed desorption/reaction spectroscopy. On a clean or an H-covered surface, successive dehydrogenation of ethylene and acetylene occurred. Hydrogen was desorbed in each dehydrogenation step, leaving the hydrocarbon fragment on the surface which eventually became a carbonaceous layer. By quantitatively measuring the flux of the desorbing species, the stoichiometry of the hydrocarbon fragments were determined. For ethylene, the first step in the dehydrogenation is the formation of adsorbed C2H3 which can be assigned to ethylidyne. On a surface with preadsorbed atomic oxygen, combustion of the hydrocarbon to CO2 and H20 dominated. However, on a surface only partially covered with oxygen, both the combustion reaction and the dehydrogenation reaction occurred simultaneously, indicating that the reactions of hydrocarbons are sensitive to the immediate environment of the surface atoms.

• Research Organization: Northwestern Univ., Chicago, IL (USA)
• OSTI ID: 6842451
• Report Number(s): PB-84-160951
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
090110 -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ACETYLENE
ALKANES
ALKENES
ALKYNES
CATALYSTS
CATALYTIC COMBUSTORS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
DEHYDROGENATION
DESORPTION
ELEMENTS
ETHYLENE
HYDROCARBONS
KINETICS
METALS
METHANE
ORGANIC COMPOUNDS
OXIDATION
PLATINUM
PLATINUM METALS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS