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

Abstract

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 ofmore » 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.« less

Authors:
 [1];
  1. Univ. of California, Berkely
Publication Date:
OSTI Identifier:
6172559
Resource Type:
Journal Article
Journal Name:
J. Catal.; (United States)
Additional Journal Information:
Journal Volume: 58:2
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; ETHANE; SYNTHESIS; HYDROCARBONS; METHANE; PROPANE; PROPYLENE; CARBON; CARBON MONOXIDE; CATALYSTS; CHEMISORPTION; HYDROGEN; HYDROGENATION; INFRARED SPECTRA; REACTION KINETICS; RUTHENIUM; SILICA; STEADY-STATE CONDITIONS; ALKANES; ALKENES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; CRYOGENIC FLUIDS; ELEMENTS; FLUIDS; KINETICS; METALS; MINERALS; NONMETALS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; REFRACTORY METALS; SEPARATION PROCESSES; SILICON COMPOUNDS; SILICON OXIDES; SORPTION; SPECTRA; TRANSITION ELEMENTS; 090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)

Citation Formats

Ekerdt, J G, and Bell, A T. Synthesis of hydrocarbons from CO and H/sub 2/ over silica-supported Ru: reaction rate measurements and infrared spectra of adsorbed species. United States: N. p., 1979. Web.
Ekerdt, J G, & Bell, A T. Synthesis of hydrocarbons from CO and H/sub 2/ over silica-supported Ru: reaction rate measurements and infrared spectra of adsorbed species. United States.
Ekerdt, J G, and Bell, A T. 1979. "Synthesis of hydrocarbons from CO and H/sub 2/ over silica-supported Ru: reaction rate measurements and infrared spectra of adsorbed species". United States.
@article{osti_6172559,
title = {Synthesis of hydrocarbons from CO and H/sub 2/ over silica-supported Ru: reaction rate measurements and infrared spectra of adsorbed species},
author = {Ekerdt, J G and Bell, A T},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6172559}, journal = {J. Catal.; (United States)},
number = ,
volume = 58:2,
place = {United States},
year = {Sat Jun 30 00:00:00 EDT 1979},
month = {Sat Jun 30 00:00:00 EDT 1979}
}