Mössbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis

G. B. Raupp; W. N. Delgass

doi:10.1016/0021-9517(79)90274-4

Mössbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis

G. B. Raupp, W. N. Delgass

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217 Scopus citations

Abstract

Mössbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523 °K reveals significant differences in carbide phases formed depending on particle, support, and alloying with Ni. Small iron particles on silica favor formation of the unstable ε{lunate}′ and ε{lunate} carbides. Large iron particles on silica and small particles on magnesia form χ carbide as is normal for bulk unpromoted iron. Alloying iron with nickel in approximately equimolar amounts completely prevents formation of bulk carbides at our reaction conditions, but some evidence exists for formation of surface carbon. The complexity of the metastable Fe/Fe_xC/C system is further exemplified in a series of spectra recorded at intermediate reaction times. These data demonstrate time dependency of carbide phases formed and dependence of the rate of carbide formation on average metal particle size.

Original language	English (US)
Pages (from-to)	348-360
Number of pages	13
Journal	Journal of Catalysis
Volume	58
Issue number	3
DOIs	https://doi.org/10.1016/0021-9517(79)90274-4
State	Published - Jul 1979
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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10.1016/0021-9517(79)90274-4

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@article{4e1dcfbb95cd4ba4b0a74e5fde8e8dc3,

title = "M{\"o}ssbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis",

abstract = "M{\"o}ssbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523 °K reveals significant differences in carbide phases formed depending on particle, support, and alloying with Ni. Small iron particles on silica favor formation of the unstable ε{lunate}′ and ε{lunate} carbides. Large iron particles on silica and small particles on magnesia form χ carbide as is normal for bulk unpromoted iron. Alloying iron with nickel in approximately equimolar amounts completely prevents formation of bulk carbides at our reaction conditions, but some evidence exists for formation of surface carbon. The complexity of the metastable Fe/FexC/C system is further exemplified in a series of spectra recorded at intermediate reaction times. These data demonstrate time dependency of carbide phases formed and dependence of the rate of carbide formation on average metal particle size.",

author = "Raupp, {G. B.} and Delgass, {W. N.}",

note = "Funding Information: We gratefully acknowledge support of this work by NSF (Grant ENG 76-20853) and the NSF Materials Research Program (Grant DMR 76-00889Al). We also thank J. B. Butt and L. H. Schwartz for stimulating discussions and for providing with a preprint of Ref. (IS).",

year = "1979",

month = jul,

doi = "10.1016/0021-9517(79)90274-4",

language = "English (US)",

volume = "58",

pages = "348--360",

journal = "Journal of Catalysis",

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publisher = "Academic Press Inc.",

number = "3",

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T1 - Mössbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis

AU - Raupp, G. B.

AU - Delgass, W. N.

N1 - Funding Information: We gratefully acknowledge support of this work by NSF (Grant ENG 76-20853) and the NSF Materials Research Program (Grant DMR 76-00889Al). We also thank J. B. Butt and L. H. Schwartz for stimulating discussions and for providing with a preprint of Ref. (IS).

PY - 1979/7

Y1 - 1979/7

N2 - Mössbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523 °K reveals significant differences in carbide phases formed depending on particle, support, and alloying with Ni. Small iron particles on silica favor formation of the unstable ε{lunate}′ and ε{lunate} carbides. Large iron particles on silica and small particles on magnesia form χ carbide as is normal for bulk unpromoted iron. Alloying iron with nickel in approximately equimolar amounts completely prevents formation of bulk carbides at our reaction conditions, but some evidence exists for formation of surface carbon. The complexity of the metastable Fe/FexC/C system is further exemplified in a series of spectra recorded at intermediate reaction times. These data demonstrate time dependency of carbide phases formed and dependence of the rate of carbide formation on average metal particle size.

AB - Mössbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523 °K reveals significant differences in carbide phases formed depending on particle, support, and alloying with Ni. Small iron particles on silica favor formation of the unstable ε{lunate}′ and ε{lunate} carbides. Large iron particles on silica and small particles on magnesia form χ carbide as is normal for bulk unpromoted iron. Alloying iron with nickel in approximately equimolar amounts completely prevents formation of bulk carbides at our reaction conditions, but some evidence exists for formation of surface carbon. The complexity of the metastable Fe/FexC/C system is further exemplified in a series of spectra recorded at intermediate reaction times. These data demonstrate time dependency of carbide phases formed and dependence of the rate of carbide formation on average metal particle size.

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DO - 10.1016/0021-9517(79)90274-4

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JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 3

ER -

Mössbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis

Abstract

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