The H/D exchange and hydrogenolysis of propane on alumina-supported nickel catalyst

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(90)90052-L· OSTI ID:5629284

Oez, H; Gaeumann, T ^[1]

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1. Federal School of Technology (Switzerland)

The exchange of propane with deuterium on an alumina-supported nickel catalyst has been studied over a range of temperature (80-190{degree}C) and to hydrocarbon/deuterium ratios. The results are interpreted in terms of a model containing three parameters in which two different adsorbed species are assumed: in the alkyl species one H-atom is exchanged in a single adsorption step, and the triadsorbed species exchanges at least three H-atoms per sojourn of the hydrocarbon molecule on the surface of the catalyst. The adsorbed species may undergo multiple exchange per adsorption step. The exchange of CH{sub 3} {center dot} CD{sub 2} {center dot} CH{sub 3} and CD{sub 3} {center dot} CH{sub 2} {center dot} CD{sub 3} with H{sub 2} and D{sub 2} was also studied. This showed that the monoadsorbed species is mainly adsorbed at the methyl group and the triadsorbed species twice at methyl group and once at the methylene group. The hydrogenolysis reactions of propane were studied in the same system between 190 and 240{degree}C. A wide range of conversion was covered, and the product distributions were fitted to kinetic equations in order to obtain the initial rate constants, i.e., selectivities. The nickel/alumina catalyst leads to multiple hydrogenolysis. Several C-C bonds are broken before the adsorbed species are desorbed. Under the conditions used in these experiments, surface cracking is the rate-limiting step.

• OSTI ID: 5629284
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 126:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CLEAVAGE
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DEHYDROGENATION
DESORPTION
DEUTERIUM
ELEMENTS
EQUATIONS
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPES
ISOTOPIC EXCHANGE
KINETIC EQUATIONS
KINETICS
LIGHT NUCLEI
METALS
MICROSTRUCTURE
NICKEL
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROPANE
PYROLYSIS
QUANTITY RATIO
REACTION KINETICS
SORPTION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
YIELDS