Deactivation by carbon of iron catalysts for indirect liquefaction

Technical Report · Thu Jan 10 04:00:00 EST 1991

DOI:https://doi.org/10.2172/6154234· OSTI ID:6154234

Bartholomew, C H

Although promoted cobalt and iron catalysts for Fischer-Tropsch (FT) synthesis of gasoline feedstock were first developed more than three decades ago, a major technical problem still limiting the commercial use of these catalysts today is carbon deactivation. This report describes recent progress in a fundamental, three-year investigation of carbon formation and its effects on the activity and selectivity of promoted iron catalysts for FT synthesis, the objectives of which are to: determine rates and mechanisms of carbon deactivation of unsupported Fe and Fe/K catalysts during CO hydrogenation over a range of CO concentrations, CO:H{sub 2} ratios, and temperatures; and model the rates of deactivation of the same catalysts in fixed-bed reactors. To accomplish the above objectives, the project is divided into the following tasks: (1) determine the kinetics of reaction and of carbon deactivation during CO hydrogenation on Fe and Fe/K catalysts coated on monolith bodies. (2) Determine the reactivities and types of carbon deposited during reaction on the same catalysts from temperature-programmed-surface-reaction spectroscopy (TPSR) and transmission electron microscopy (TEM). Determine the types of iron carbides formed at various temperatures and H{sub 2}/CO ratios using x-ray diffraction and Moessbauer spectroscopy. (3) Develop mathematical deactivation models which include heat and mass transport contributions for FT synthesis is packed-bed reactors. Progress to date is described. 48 refs., 3 figs., 1 tab.

• Research Organization: Brigham Young Univ., Provo, UT (USA)
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FG22-86PC90533
• OSTI ID: 6154234
• Report Number(s): DOE/PC/90533-15; ON: DE91006700
• Country of Publication: United States
• Language: English

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ADSORPTION
ALKALI METALS
CARBIDES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
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ELECTRON MICROSCOPY
ELEMENTS
ENERGY TRANSFER
FISCHER-TROPSCH SYNTHESIS
HEAT TRANSFER
HYDROGEN
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IRON
IRON CARBIDES
IRON COMPOUNDS
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NONMETALS
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SYNTHESIS
TEMPERATURE CONTROL
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TRANSITION ELEMENT COMPOUNDS
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TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION