Thermal desorption and disproportionation of CO adsorbed on Ru/SiO sub 2

Journal Article · Tue Oct 31 23:00:00 EST 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90246-7· OSTI ID:6781368

Yokomizo, G H; Loius, C; Bell, A T ^[1]

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1. Lawrence Berkeley Laboratory, CA (USA)

The dynamics of CO desorption from a Ru/SiO{sub 2} catalyst have been studied by means of temperature-programmed desorption (TPD) spectroscopy and infrared spectroscopy. The adsorption of CO onto reduced Ru/SiO{sub 2} leads to the appearance of tricarbonyl species and linearly adsorbed CO. The tricarbonyl species are present on Ru{sup 2+} cations bonded directly to support (i.e., (SiO){sub 2}Ru(CO){sub 3}), whereas the linearly adsorbed CO resides on the surface of Ru crystallites. During TPD, CO is released from the tricarbonyl species at temperatures between 300 and 475 K. Desorption of linearly adsorbed CO begins at 300 K and reaches a maximum at 520 K. CO{sub 2} formed via the Boudouard reaction is achieved above 500 K. No molecularly adsorbed CO is present on the catalyst surface above 675 K. CO and CO{sub 2} formation at temperatures above 675 K are due to the recombination of adsorbed C and O atoms. Only linearly adsorbed CO is reactive for the formation of methane. Atomically adsorbed carbon formed by the dissociation of CO is reactive with H{sub 2} in three different temperature regimes, reflecting the presence of different forms of adsorbed carbon. 18 refs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6781368
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 120:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
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ORGANIC COMPOUNDS
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OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
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SILICON COMPOUNDS
SILICON OXIDES
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE CONTROL
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TRANSITION ELEMENTS