Carbon-supported Fe-Mn and K-Fe-Mn clusters for the synthesis of C/sub 2/-C/sub 4/ olefins from CO and H/sub 2/. I. Chemisorption and catalytic behavior
Highly dispersed Fe-Mn bimetallic particles were obtained on a high-surface-area amorphous carbon black support using Fe-Mn and K-Fe-Mn carbonyl clusters. These catalysts were characterized by hydrogen adsorption and by CO chemisorption at 195 and 300 K, and their kinetic behavior for CO hydrogenation was studied at 1 atm in a differential, plug-flow microreactor. The K-promoted clusters with stoichiometries of KMnFe and KMnFe/sub 2/ gave 85-90 wt% ethylene, propylene, and butene with methane as the only other detectable hydrocarbon product. The KFe/sub 3/ cluster also had a high selectivity to olefins but showed somewhat more chain growth. The nonpromoted Mn-Fe catalysts with Fe/Mn = 2, prepared from either stoichiometric mixed-metal carbonyl clusters or coimpregnation of the separate Fe and Mn carbonyl clusters, also had a high selectivity to light olefins; however, this selectivity was strongly dependent upon the pretreatment. The properties of the FeMn clusters without K is consistent with a proposed model in which a surface spinel, (Fe/sub 1-y/Mn/sub y/)/sub 3/O/sub 4/, plays a principal role in providing high selectivity to light olefins.
- Research Organization:
- Pennsylvania State Univ., University Park
- OSTI ID:
- 5665556
- Journal Information:
- J. Catal.; (United States), Vol. 103:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON MONOXIDE
METHANATION
IRON
CATALYTIC EFFECTS
MANGANESE
POTASSIUM
ADSORPTION
BIMETALS
BUTENES
CARBON BLACK
CATALYST SUPPORTS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMISORPTION
COMPARATIVE EVALUATIONS
ETHYLENE
FISCHER-TROPSCH SYNTHESIS
HYDROGENATION
METHANE
MOLECULAR MODELS
PROMOTERS
PROPYLENE
SURFACE AREA
ALKALI METALS
ALKANES
ALKENES
CARBON
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
KINETICS
MATHEMATICAL MODELS
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)