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

Journal Article · Sun Feb 01 04:00:00 EST 1987 · J. Catal.; (United States)

OSTI ID:5665556

Venter, J; Kaminsky, M; Geoffroy, G L; Vannice, M A

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), Journal Name: J. Catal.; (United States) Vol. 103:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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010408* -- Coal
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BIMETALS
BUTENES
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CARBON COMPOUNDS
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HYDROCARBONS
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KINETICS
MANGANESE
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ORGANIC COMPOUNDS
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