The hydrogen-oxygen reaction on the Pt(111) surface: temperature programmed reaction of coadsorbed atomic oxygen and atomic hydrogen

Conference · Mon Mar 01 04:00:00 EST 1982 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:6482899

Gland, J L; Fisher, G B

As part of a larger program to characterize simple oxidation reactions on noble metal surfaces several studies of the hydrogen-oxygen reaction have been performed on the Pt(111) surface. Coadsorbed atomic oxygen and atomic hydrogen react below the water desorption temperature of 180/sup 0/K on the Pt(111) surface. Examination of the surface both spectroscopically and by thermal desorption indicates that the water formation reaction goes to completion even at 120/sup 0/K on the Pt(111) surface. This low temperature reaction result establishes the existence of an atomic hydrogen addition mechanism since molecular hydrogen was not present during these experiments. Results of isotopic titration experiments run in the 300/sup 0/K to 450/sup 0/K temperature range indicate that the addition of atomic hydrogen to adsorbed atomic oxygen is also the dominant reaction mechanism at elevated temperatures, even during titration of adsorbed atomic oxygen with hydrogen from the gas phase. The titration results further indicate that all of the adsorbed atomic oxygen is not uniformly available for reaction. The primary results of titration experiments reported earlier can be explained by a simple reaction model which assumes that the reaction only occurs along oxygen island perimeters.

• Research Organization: General Motors Research Lab., Warren, MI
• OSTI ID: 6482899
• Report Number(s): CONF-820304-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 27:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESORPTION
ELEMENTS
HYDROGEN
ISOTOPIC EXCHANGE
KINETICS
METALLURGY
METALS
NONMETALS
OXIDATION
OXYGEN
PHYSICAL METALLURGY
PLATINUM
PLATINUM METALS
REACTION KINETICS
SORPTION
SURFACE PROPERTIES
TEMPERATURE EFFECTS
TITRATION
TRANSITION ELEMENTS