Isotopic transient kinetic analysis of ethane hydrogenolysis on Cu modified Ru/SiO{sub 2}

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1996.0022· OSTI ID:223984

Chen, B; Goodwin, Jr, J G ^[1]

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1. Univ. of Pittsburgh, PA (United States)

Since Cu is known to decorate Ru surfaces but is not active for ethane hydrogenolysis, it provides a means to study the effect of modifier decoration on this highly structure sensitive reaction. The effect of this decoration on the concentration of the active intermediates and the surface kinetics during ethane hydrogenolysis on Ru/SiO{sub 2} has been studied using isotopic transient kinetics analysis. The abundances, coverages, and lifetimes of active surface intermediates of the reaction were measured under initial reaction conditions. Approximate intrinsic activities and abundances of surface dicarbon and monocarbon species were found to change significantly with the addition of Cu. The results show that low loadings of Cu appeared to block preferentially the sites which were the most active but much less abundant on the Ru surface, confirming the theoretical calculations of Strohl and King which suggested a nonuniform distribution of Cu on Ru crystallites. Ensemble sizes for ethane adsorption and hydrogenolysis were found to be ca. 5 and 12, respectively, based on a correlation between the change in surface abundance of each reactive intermediate species and the fraction of Ru surface atoms exposed. Approximate intrinsic activity related to breakage of the C-C bond during ethane hydrogenolysis varied significantly for different sites, while that related to hydrogenation of monocarbon species was essentially the same for all sites. 37 refs., 9 figs., 5 tabs.

• OSTI ID: 223984
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 158; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
40 CHEMISTRY
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
COPPER
ETHANE
HYDROGENATION
REACTION INTERMEDIATES
RUTHENIUM
SILICA