Mechanism of graphite hydrogenation catalyzed by ruthenium particles

Peter J. Goethel; Ralph T. Yang

doi:10.1016/0021-9517(88)90079-6

Mechanism of graphite hydrogenation catalyzed by ruthenium particles

Peter J. Goethel
, Ralph T. Yang

Department of Chemical and Biological Engineering

SUNY Buffalo

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

Monolayer channeling on the basal plane of graphite is studied for the Ru-catalyzed CH₂ reaction (producing CH₄). Etch decoration transmission electron microscopy is the principal technique employed in the study. The monolayer channeling action commences at approximately 850 °C and involves the following sequential steps: breakage of two carbon-carbon bonds and dissolution of C in Ru at the {101l} edge/Ru interface, bulk/surface diffusion of C in Ru, and reaction of C with chemisorbed H on the Ru surface. The surface reaction is the rate-limiting step. Using a lower-bound diffusivity from filament growth data and our experimental value of solubility, the bulk diffusion flux of C in Ru is an order of magnitude higher than the overall rate. Furthermore, it is shown that the contribution of monolayer channeling to the overall carbon gasification rate is at least as important as that by deep-layer channeling.

Original language	English
Pages (from-to)	220-226
Number of pages	7
Journal	Journal of Catalysis
Volume	111
Issue number	1
DOIs	https://doi.org/10.1016/0021-9517(88)90079-6
State	Published - May 1988

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title = "Mechanism of graphite hydrogenation catalyzed by ruthenium particles",

abstract = "Monolayer channeling on the basal plane of graphite is studied for the Ru-catalyzed CH2 reaction (producing CH4). Etch decoration transmission electron microscopy is the principal technique employed in the study. The monolayer channeling action commences at approximately 850 °C and involves the following sequential steps: breakage of two carbon-carbon bonds and dissolution of C in Ru at the \{101l\} edge/Ru interface, bulk/surface diffusion of C in Ru, and reaction of C with chemisorbed H on the Ru surface. The surface reaction is the rate-limiting step. Using a lower-bound diffusivity from filament growth data and our experimental value of solubility, the bulk diffusion flux of C in Ru is an order of magnitude higher than the overall rate. Furthermore, it is shown that the contribution of monolayer channeling to the overall carbon gasification rate is at least as important as that by deep-layer channeling.",

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AU - Goethel, Peter J.

AU - Yang, Ralph T.

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N2 - Monolayer channeling on the basal plane of graphite is studied for the Ru-catalyzed CH2 reaction (producing CH4). Etch decoration transmission electron microscopy is the principal technique employed in the study. The monolayer channeling action commences at approximately 850 °C and involves the following sequential steps: breakage of two carbon-carbon bonds and dissolution of C in Ru at the {101l} edge/Ru interface, bulk/surface diffusion of C in Ru, and reaction of C with chemisorbed H on the Ru surface. The surface reaction is the rate-limiting step. Using a lower-bound diffusivity from filament growth data and our experimental value of solubility, the bulk diffusion flux of C in Ru is an order of magnitude higher than the overall rate. Furthermore, it is shown that the contribution of monolayer channeling to the overall carbon gasification rate is at least as important as that by deep-layer channeling.

AB - Monolayer channeling on the basal plane of graphite is studied for the Ru-catalyzed CH2 reaction (producing CH4). Etch decoration transmission electron microscopy is the principal technique employed in the study. The monolayer channeling action commences at approximately 850 °C and involves the following sequential steps: breakage of two carbon-carbon bonds and dissolution of C in Ru at the {101l} edge/Ru interface, bulk/surface diffusion of C in Ru, and reaction of C with chemisorbed H on the Ru surface. The surface reaction is the rate-limiting step. Using a lower-bound diffusivity from filament growth data and our experimental value of solubility, the bulk diffusion flux of C in Ru is an order of magnitude higher than the overall rate. Furthermore, it is shown that the contribution of monolayer channeling to the overall carbon gasification rate is at least as important as that by deep-layer channeling.

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DO - 10.1016/0021-9517(88)90079-6

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Mechanism of graphite hydrogenation catalyzed by ruthenium particles

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