Sun, Y.-K. and Weinberg, W. H. (1990) Kinetics of dissociative chemisorption of methane and ethane on Pt(110)-(1X2). Journal of Vacuum Science and Technology A, 8 (3). pp. 2445-2448. ISSN 0734-2101 http://resolver.caltech.edu/CaltechAUTHORS:20120509-154443494
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The initial probability of dissociative chemisorption Pr of methane and ethane on the highly corrugated, reconstructed Pt(110)‐(1×2) surface has been measured in a microreactor by counting the number of carbon atoms on the surface following the reaction of methane and ethane on the surface which was held at various constant temperatures between 450 and 900 K during the reaction. Methane dissociatively chemisorbs on the Pt(110)‐(1×2) surface with an apparent activation energy of 14.4 kcal/mol and an apparent preexponential factor of 0.6. Ethane chemisorbs dissociatively with an apparent activation energy of 2.8 kcal/mol and an apparent preexponential factor of 4.7×10^(−3). Kinetic isotope effects were observed for both reactions. The fact that P_r is a strong function of surface temperature implies that the dissociation reactions proceed via a trapping‐mediated mechanism. A model based on a trapping‐mediated mechanism is used to explain the observed kinetic behavior. Kinetic parameters for C–H bond dissociation of the thermally accommodated methane and ethane are extracted from the model.
|Additional Information:||© 1990 American Vacuum Society. Received 25 August 1989; accepted 30 October 1989. This work was supported by the Office of Basic Energy Sciences of the Department of Energy (Grant No. DE-FG03-89ER14048). Additional support was provided by the Donors of the Petroleum Research Fund of the American Chemical Society (Grant No. PRF19819-AC5-C).|
|Subject Keywords:||SURFACE REACTIONS, CHEMISORPTION, METHANE, ETHANE, PLATINUM, SORPTIVE PROPERTIES, CHEMICAL REACTION KINETICS, DISSOCIATION, ACTIVATION ENERGY, ISOTOPE EFFECTS|
|Classification Code:||PACS: 68.43.-h|
|Official Citation:||Kinetics of dissociative chemisorption of methane and ethane on Pt(110)‐(1×2) Y.‐K. Sun and W. H. Weinberg J. Vac. Sci. Technol. A 8, 2445 (1990); http://dx.doi.org/10.1116/1.576712|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||10 May 2012 14:48|
|Last Modified:||26 Dec 2012 15:11|
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