Improved Fischer-Tropsch synthesis catalysts for indirect coal liquefaction: Final quarterly technical progress report No. 4 for the period 1 July to 30 September 1986
We have made significant progress in developing novel catalysts for the Fischer-Tropsch synthesis (FTS). The stoichiometries of the cluster synthesis and surface-confining reactions on an alumina support for aluminum tetra- and aluminum hexa-ruthenium hydridocarbonyl cluster catalysts were determined by gas evolution measurements. Characterization with FTIR and NMR spectroscopy of the cluster intermediates is also consistent with the observed cluster catalyst stoichiometry, Al/sub 2/O/sub 3/-Al(C/sub 2/H/sub 5/)-Ru/sub 4/H/sub 3/(CO)/sub 12/ and Al/sub 2/O/sub 3/-Al(C/sub 2/H/sub 5/)-Ru/sub 6/H(CO)/sub 18/. Activation of the surface-confined supported cluster complex by heating to 573 K in inert gas or hydrogen is likely to produce a stabilized cluster catalyst due to affinity of aluminum for alumina and the strength of the aluminum-ruthenium bonds relative to ruthenium-ligand bonds. The cluster catalysts were tested for FTS in 2:1 H/sub 2/:CO syngas at 523 K and 1 atm. The 0.6 wt % Ru/sub 4/ catalyst had superior activity and about the same selectivity through C/sub 8/ hydrocarbons as a commercial alumina-supported 0.5 wt % Ru catalyst. The 1.2 wt % Ru/sub 6/ catalyst was less active but had similar selectivity. Substantial changes in selectivity of standard-fused iron catalysts were found following treatment to uniformly chemisorb submonolayer quantities of sulfur. Approximately 40% of a monolayer of sulfur was slowly adsorbed at 473 K on the potassium-promoted fused iron catalyst following reduction and passivation by accumulation of a surface layer of carbon and CO. The passivating layer was removed and the sulfur was locally dispersed by heating to 1000 K in hydrogen. The treated catalyst had a three-fold reduction in methane selectivity-relative to untreated reduced fused iron at 573 K, and the C/sub 2/ olefin yield approached 100%. 7 refs., 1 fig., 3 tabs.
- Research Organization:
- SRI International, Menlo Park, CA (USA)
- DOE Contract Number:
- AC22-85PC80016
- OSTI ID:
- 6956188
- Report Number(s):
- DOE/PC/80016-T2; ON: DE87005037
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Improved Fischer-Tropsch synthesis catalysts for indirect coal liquefaction: Quarterly technical progress report No. 6 for the period 1 January to 31 March 1987
Improved Fischer-Tropsch synthesis catalysts for indirect coal liquefaction: Quarterly technical progress report No. 7 for the period 1 April to 30 June 1987
Related Subjects
10 SYNTHETIC FUELS
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CATALYSTS
CHEMICAL PREPARATION
PERFORMANCE TESTING
STRUCTURAL CHEMICAL ANALYSIS
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
SYNTHESIS
IRON
RUTHENIUM COMPLEXES
ATMOSPHERIC PRESSURE
CATALYST SUPPORTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN 1
INFRARED SPECTRA
NMR SPECTRA
SULFIDATION
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
DATA
ELEMENTS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
METALS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SPECTRA
STABLE ISOTOPES
TESTING
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)
090121 - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)