Use of composite ruthenium catalysts in Fischer-Tropsch synthesis

Thesis/Dissertation · Sat Jan 01 04:00:00 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
• Country of Publication: United States
• Language: English

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10 SYNTHETIC FUELS
ALKALI METALS
ALKANES
ALKENES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISORPTION
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DISTRIBUTION
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
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INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MINERALS
ORGANIC COMPOUNDS
PLATINUM METALS
POTASSIUM
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REACTION KINETICS
RUTHENIUM
SCATTERING
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENTS
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ZEOLITES