Deuterium exchange reactions of isobutane, n-hexane, and n-heptane catalyzed over platinum single crystal surfaces

Journal Article · Thu Apr 28 04:00:00 EDT 1983 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100232a019· OSTI ID:5276333

Davis, S M; Somarjai, G A

Isotopic exchange reactions of isobutane, n-heptane, and n-hexane with deuterium gas have been investigated near atmospheric pressure in the temperature range 500-650 K over the flat (111) and kinked (10,8,7) crystal faces of platinum. The exchange kinetics at low conversion displayed zero activation energy, a first-order dependence on D/sub 2/ pressure, and a strong negative-order dependence on the surface coverage by strongly bound carbonaceous species. Initial exchange rates and product distributions were not influenced appreciably by the presence of steps and kinks on the platinum surface, and the exchange product distributions varied little with temperature, D/sub 2/ pressure, and surface composition. Hydrocarbon (HC) conversion and deuterium exchange rates measured simultaneously for n-hexane reactions catalyzed over Pt(111) revealed that deuterium exchange always occurs more rapidly as compared to all other competing chemical reactions.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 5276333
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400303* -- Organic Chemistry-- Isotope Exchange & Isotope Separation-- (-1987)
ALKANES
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
DEUTERIUM
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LIGHT NUCLEI
METALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
REACTION KINETICS
STABLE ISOTOPES
TRANSITION ELEMENTS