Reaction between H/sub 2/ and O/sub 2/ over supported platinum catalysts

Journal Article · Thu Jun 15 04:00:00 EDT 1978 · J. Catal.; (United States)

OSTI ID:6651279

Hanson, F V; Boudart, M

The stationary-state reaction between H/sub 2/ and O/sub 2/ over Pt/SiO/sub 2/ catalysts has been studied between 273/sup 0/ and 373/sup 0/K in both excess hydrogen and excess oxygen on samples with dispersion of platinum varying between 1.0 and 0.14. In excess hydrogen, the catalyst with the highest dispersion was seven times more active at 273 K than was the catalyst with the lowest dispersion and the reaction was first order in oxygen and zero order in hydrogen. In contrast, in excess oxygen, the catalytic activity was almost independent of particle size, and the reaction was first order in hydrogen and zero order in oxygen. It is proposed that in excess oxygen, the reaction takes place on an oxidized surface where corrosive chemisorption of oxygen has erased structural anisotropies. In excess hydrogen, this phenomenon is apparently absent and the reaction is structure sensitive. 7 figures, 5 tables, 34 references.

• Research Organization: Stanford Univ., CA
• OSTI ID: 6651279
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 53:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDROGEN
KINETICS
MECHANICAL STRUCTURES
MEDIUM TEMPERATURE
METALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTICLE SIZE
PLATINUM
PLATINUM METALS
QUANTITY RATIO
REACTION KINETICS
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SUPPORTS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS