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Title: Deactivation by carbon of iron catalysts for indirect liquefaction

Abstract

Progress is reported for a four-year fundamental investigation of carbon formation and its effects on the activity and selectivity of promoted iron catalysts for FT synthesis, the objectives of which were to (1) determine rates and mechanisms of carbon deactivation of unsupported Fe and Fe/K catalysts during CO hydrogenation and (2) model the global rates of deactivation at the surface of the catalyst for the same catalysts. A computer-automated reactor system to be used in the kinetic and deactivation studies was designed, constructed and tested. Kinetic data for CO hydrogenation on unsupported, unpromoted iron, 99% Fe/1% Al{sub 2}O{sub 3}, and K-promoted 99% Fe/1% Al{sub 2}O{sub 3} catalysts were obtained as functions of temperature, reactant particle pressures and time. The activity/selectivity and kinetic data are consistent with those previously reported for supported, unpromoted and promoted iron. Two kinds of deactivation were observed during FT synthesis on these samples: (1) loss of surface area after reduction of unsupported, unpromoted iron at 400{degree}C and (2) loss of activity with time due to carbon deposition, especially in the case of K-promoted 99% Fe/1% A1{sub 2}O{sub 3}. Deactivation rate data were obtained for CO hydrogenation on promoted Fe as a function of time, temperature, andmore » H{sub 2}/CO ratio. 50 refs., 24 figs., 5 tabs.« less

Authors:
Publication Date:
Research Org.:
Brigham Young Univ., Provo, UT (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5719686
Report Number(s):
DOE/PC/90533-16
ON: DE91011276
DOE Contract Number:  
FG22-86PC90533
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CATALYSTS; DEACTIVATION; IRON; ALUMINIUM OXIDES; CARBON; CARBON MONOXIDE; FISCHER-TROPSCH SYNTHESIS; HYDROGENATION; POTASSIUM; PROGRESS REPORT; SPECIFICITY; SURFACE AREA; ALKALI METALS; ALUMINIUM COMPOUNDS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; DOCUMENT TYPES; ELEMENTS; METALS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; SURFACE PROPERTIES; TRANSITION ELEMENTS; 010408* - Coal, Lignite, & Peat- C1 Processes- (1987-)

Citation Formats

Bartholomew, C H. Deactivation by carbon of iron catalysts for indirect liquefaction. United States: N. p., 1991. Web. doi:10.2172/5719686.
Bartholomew, C H. Deactivation by carbon of iron catalysts for indirect liquefaction. United States. https://doi.org/10.2172/5719686
Bartholomew, C H. 1991. "Deactivation by carbon of iron catalysts for indirect liquefaction". United States. https://doi.org/10.2172/5719686. https://www.osti.gov/servlets/purl/5719686.
@article{osti_5719686,
title = {Deactivation by carbon of iron catalysts for indirect liquefaction},
author = {Bartholomew, C H},
abstractNote = {Progress is reported for a four-year fundamental investigation of carbon formation and its effects on the activity and selectivity of promoted iron catalysts for FT synthesis, the objectives of which were to (1) determine rates and mechanisms of carbon deactivation of unsupported Fe and Fe/K catalysts during CO hydrogenation and (2) model the global rates of deactivation at the surface of the catalyst for the same catalysts. A computer-automated reactor system to be used in the kinetic and deactivation studies was designed, constructed and tested. Kinetic data for CO hydrogenation on unsupported, unpromoted iron, 99% Fe/1% Al{sub 2}O{sub 3}, and K-promoted 99% Fe/1% Al{sub 2}O{sub 3} catalysts were obtained as functions of temperature, reactant particle pressures and time. The activity/selectivity and kinetic data are consistent with those previously reported for supported, unpromoted and promoted iron. Two kinds of deactivation were observed during FT synthesis on these samples: (1) loss of surface area after reduction of unsupported, unpromoted iron at 400{degree}C and (2) loss of activity with time due to carbon deposition, especially in the case of K-promoted 99% Fe/1% A1{sub 2}O{sub 3}. Deactivation rate data were obtained for CO hydrogenation on promoted Fe as a function of time, temperature, and H{sub 2}/CO ratio. 50 refs., 24 figs., 5 tabs.},
doi = {10.2172/5719686},
url = {https://www.osti.gov/biblio/5719686}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 14 00:00:00 EST 1991},
month = {Thu Feb 14 00:00:00 EST 1991}
}