Poisoning by carbon monoxide in the hydrogen exchange reaction between deuterium gas and water preadsorbed on a platinum--alumina catalyst

Journal Article · Thu Feb 01 04:00:00 EST 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(79)90109-X· OSTI ID:6299404

Iida, I ^[1]; Tamaru, K

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1. Sagami Chemical Research Center, Sagamihara, Kanagawa, Japan

Poisoning by carbon monoxide in the exchange reaction between deuterium and the water preadsorbed on a platinum--alumina catalyst was studied, by measuring not only the rate of reaction but also its kinetic behavior and the adsorption of reactants on the catalyst surface. The shape of the poisoning curve is closely associated with the kinetic behavior and exhibited an abrupt change on freezing the adsorbed water below 273/sup 0/K. When the rate is proportional to deuterium pressure and independent of the amount of water adsorbed, the exchange rate dropped sharply by carbon monoxide adsorbed of a few percent coverage without any marked changes in the amount and the rate of hydrogen adsorption on the platinum surface. However, at temperatures lower than 273/sup 0/K and at higher deuterium pressures, the rate depends not on the deuterium pressure but on the amount of water adsorbed. The migration of hydrogen in or through the adsorbed water is seemingly sufficiently suppressed by freezing to control the overall reaction rate. In this case, a small amount of adsorption of carbon monoxide did not show any toxicity, but then a steep poisoning started accompanying a change in the kinetic behavior. It was accordingly demonstrated that the mechanism of the reaction may be better understood by studying poisoning and measuring adsorption, overall rate, and kinetic behavior.

• OSTI ID: 6299404
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 56:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DATA FORMS
DEUTERIUM
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOLATED VALUES
ISOTOPE EFFECTS
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LIGHT NUCLEI
LOW PRESSURE
MECHANICAL STRUCTURES
MEDIUM TEMPERATURE
METALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POISONING
PRESSURE DEPENDENCE
REACTION KINETICS
SORPTION
STABLE ISOTOPES
SUPPORTS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENTS
WATER