Use of composite ruthenium catalysts in Fischer-Tropsch synthesis

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 1983

OSTI ID:6347048

Yang, C H

The catalytic properties of various supported ruthenium catalysts were investigated in the Fischer-Tropsch synthesis reaction at low pressures (1-3 atm). Reaction products from these systems consisted of primarily linear olefins and paraffins ranging from methane to C/sub 10/ + long chain hydrocarbons. TiO/sub 2/-supported Ru was found to have higher selectivities to C/sub 2/-C/sub 4/ olefins than the conventional Ru/SiO/sub 2/ and Ru/Al/sub 2/O/sub 3/ catalysts. Evidence from catalyst characterization by chemisorption and XRD indicated that Ru/TiO/sub 2/, after high temperature reduction, exhibited strong metal-support interactions (SMSI). Potassium was found to be a selective promoter for olefin production over supported Ru catalysts. The addition of potassium to Ru/SiO/sub 2/ strongly reduced the ability of Ru to chemisorb H/sub 2/ but enhanced its selectivity to olefins and higher hydrocarbon products. When large pore zeolites such as NaX, CuX, HY, and H-mordenite were used as second components in the Ru/TiO/sub 2/ composite mixture, the distribution of hydrocarbon productions for the primary Ru catalysts was strongly modified. It is concluded that zeolite provides a synergism to modify the properties of Ru/TiO/sub 2/ in: 1) increasing overall CO conversion 2) increasing C/sub 4/ hydrocarbon formation and 3) decreasing the relative rate of chain growth of C/sub 4/+ hydrocarbons according to the non-trivial reaction kinetics.

• OSTI ID: 6347048
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
10 SYNTHETIC FUELS
FISCHER-TROPSCH SYNTHESIS
CATALYSTS
POTASSIUM
CATALYTIC EFFECTS
RUTHENIUM
ZEOLITES
ALKANES
ALKENES
CATALYST SUPPORTS
CHEMICAL REACTION YIELD
CHEMISORPTION
COMPARATIVE EVALUATIONS
DISTRIBUTION
PRODUCTION
REACTION KINETICS
VARIATIONS
X-RAY DIFFRACTION
ALKALI METALS
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MINERALS
ORGANIC COMPOUNDS
PLATINUM METALS
SCATTERING
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENTS
YIELDS
010404* - Coal
Lignite
& Peat- Gasification
090121 - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)