Tracer studies on the reaction paths of the CO oxidation over platinum

Journal Article · Fri Dec 01 04:00:00 EST 1978 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(78)90221-X· OSTI ID:6281582

Matsushima, T

Transient production of carbon dioxide was monitored by mass spectrometry where a polycrystalline platinum foil covered by given amounts of carbon monoxide was exposed to various gas mixtures of carbon monoxide and oxygen at room temperature. The transient feature depended strongly on the amount of carbon monoxide preadsorbed and the pressure of the dosed gas. When the substrate was covered in advance with carbon monoxide labeled with carbon 13, the initial ratio of /sup 13/CO/sub 2/ to /sup 12/CO/sub 2/ in the carbon dioxide produced was equal to that of /sup 13/CO to /sup 12/CO in the carbon monoxide preadsorbed. The equality between them held true for all pressures and the compositions of the dosed gas and for the initial coverages of carbon monoxide studied. Carbon monoxide immediately prior to oxidation was concluded to be in a chemisorption state, i.e., carbon dioxide is produced via a Langmuir--Hinshelwood process, namely CO(a) + O(a) ..-->.. CO/sub 2/. No contribution from an Elev--Rideal process, namely CO(g) + O(a) ..-->.. CO/sub 2/, was observed. 5 figures, 2 tables.

• Research Organization: Hokkaido Univ., Sapporo, Japan
• OSTI ID: 6281582
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 55:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400303 -- Organic Chemistry-- Isotope Exchange & Isotope Separation-- (-1987)
ADSORPTION
CARBON 13
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
CRYSTALS
ELEMENTS
EVEN-ODD NUCLEI
FLUIDS
FOILS
GASES
HIGH VACUUM
ISOTOPES
ISOTOPIC EXCHANGE
LABELLING
LIGHT NUCLEI
MASS SPECTRA
METALS
NONMETALS
NUCLEI
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POLYCRYSTALS
PRESSURE DEPENDENCE
SORPTION
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENTS
YIELDS