Uncatalyzed and platinum-catalyzed gasification of carbon by water and carbon dioxide

Journal Article · Tue Jun 01 04:00:00 EDT 1982 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(82)90216-0· OSTI ID:6847394

Holstein, W L; Boudart, M

Differential rates and integral surface time yields of the uncatalyzed and platinum-catalyzed gasification of carbon by H/sub 2/O and CO/sub 2/ were measured above and below 950 K, respectively, at pressures below atmospheric. Both the uncatalyzed and catalyzed reactions were inhibited by their products. At 890 K the catalyzed reactions were about 100 times faster than the uncatalyzed reactions. Reaction orders of the platinum-catalyzed gasification of carbon by H/sub 2/O wth respect to H/sub 2/O and H/sub 2/ and kinetic isotope effects in H/sub 2/O/H/sub 2/ and D/sub 2/O/D/sub 2/ suggest equilibration between gaseous H/sub 2/O and H/sub 2/ (or D/sub 2/O and D/sub 2/) and surface atomic oxygen. The latter yields CO by reaction with carbon which has been transported to the platinum surface following breakage of carbon-carbon bonds at the platinum-carbon interface. The selectivity of carbon gasification of CO, CO/sub 2/, and CH/sub 4/ indicates that CO/sub 2/ is produced from CO by water-gas shift, while CH/sub 4/ is produced by hydrogenolysis of carbon. The platinum-catalyzed gasification of carbon by CO/sub 2/ proceeds through a similar series of steps as that for the gasification by H/sub 2/O.

• Research Organization: Stanford Univ., CA
• OSTI ID: 6847394
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 75:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ALKANES
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
DATA
DEUTERIUM
ELEMENTS
EXPERIMENTAL DATA
GASIFICATION
HEAVY WATER
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
KINETICS
LIGHT NUCLEI
METALS
METHANE
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REACTION KINETICS
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
WATER