Synthesis of hydrocarbons from CO and H/sub 2/ over silica-supported Ru: reaction rate measurements and infrared spectra of adsorbed species

Journal Article · Sat Jun 30 04:00:00 EDT 1979 · J. Catal.; (United States)

OSTI ID:6172559

Ekerdt, J G ^[1]; Bell, A T

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1. Univ. of California, Berkely

The synthesis of hydrocarbons from CO and H/sub 2/ was studied on a silica-supported Ru catalyst, and the species present on the catalyst surface were characterized by infrared spectroscopy. Initial rates of methane formation were correlated by the expression N/sub ch4/ = 5.6 x 10/sup 6/ exp(-24,000/RT)Pu/sub H2//sup 1/ /sup 5//Pco/sup 0/ /sup 6/. The synthesis of ethane, propylene, and propane, the principle products observed in addition to methane, was favored at high CO partial pressures, low H/sub 2//CO ratios, and low temperatures. The primary feature observed in the infrared spectra was a band at 2030 cm/sup -1/, associated with chemisorbed CO. Neither the position nor intensity of this band was affected by the CO partial pressure or the H/sub 2//CO ratio. The CO band intensity did decrease with increasing temperature due to a decrease in CO surface coverage. Bands were also observed at 2950, 2910, and 2845 cm/sup -1/ and were assigned to hydrocarbon structures surrounded by chemisorbed CO. These structures could be removed from the catalyst surface by hydrogenation, but do not appear to be intermediates in the synthesis of stable products. Reduction of the catalyst following steady-state reaction revealed that the working catalyst maintains a reservoir of carbon several Ru monolayers in magnitude. Carbon deposition mechanisms and the role of carbon in the synthesis of hydrocarbons are discussed. 16 figures, 2 tables.

• OSTI ID: 6172559
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 58:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALKANES
ALKENES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CRYOGENIC FLUIDS
ELEMENTS
ETHANE
FLUIDS
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFRARED SPECTRA
KINETICS
METALS
METHANE
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PROPANE
PROPYLENE
REACTION KINETICS
REFRACTORY METALS
RUTHENIUM
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTRA
STEADY-STATE CONDITIONS
SYNTHESIS
TRANSITION ELEMENTS