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Title: SBA-15-supported iron catalysts for Fischer-Tropsch production of diesel fuel

Abstract

Iron supported on SBA-15, a mesoporous structured silica, has been developed as a catalyst for the Fischer-Tropsch synthesis of hydrocarbons. The catalysts retain the high surface area of the support, {approximately}500 m{sup 2}/g, average pore size, and pore volume. Inclusion of aluminum into the SBA-15 did not significantly alter these parameters. XRD, XAFS, and Moessbauer spectroscopies were used to characterize the catalyst before and after being subjected to the reaction conditions. Prior to reaction, the iron was distributed among {alpha}-Fe{sub 2}O{sub 3}, ferrihydrite, and minor {gamma}Fe{sub 2}O{sub 3}. After reaction, the iron phases detected were nonmagnetic iron oxides, iron carbide, and metallic iron. The length of the induction period typically seen with iron-based F-T catalysts was strongly dependent on the amount of aluminum present in the catalyst. With no aluminum, the induction period lasted about 25 h, whereas the induction period decreased to less than 5 h with an Al:Si mass ratio of 0.010. A further increase in aluminum content lengthened the induction period, but always remained less than that without aluminum. Catalyst activity and product selectivity were also strongly dependent on aluminum content with the maximum diesel fuel fraction, C{sub 11+}, occurring with the Al:Si ratio of 0.010 andmore » a CO conversion of 37%. The small concentration of aluminum may serve to increase the rate of iron carbide formation, whereas higher concentrations may begin to inhibit the rate. 23 refs., 6 figs., 2 tabs.« less

Authors:
; ; ; ; ; ;  [1]
  1. University of Utah, Salt Lake City, UT (United States). Department of Chemistry
Publication Date:
OSTI Identifier:
20838266
Resource Type:
Journal Article
Resource Relation:
Journal Name: Energy and Fuels; Journal Volume: 20; Journal Issue: 6; Other Information: eyring@chem.utah.edu
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CATALYST SUPPORTS; SILICA; IRON; CATALYSTS; FISCHER-TROPSCH SYNTHESIS; DIESEL FUELS; CATALYTIC EFFECTS

Citation Formats

Dae Jung Kim, Brian C. Dunn, Frank Huggins, Gerald P. Huffman, Min Kang, Jae Eui Yie, and Edward M. Eyring. SBA-15-supported iron catalysts for Fischer-Tropsch production of diesel fuel. United States: N. p., 2006. Web.
Dae Jung Kim, Brian C. Dunn, Frank Huggins, Gerald P. Huffman, Min Kang, Jae Eui Yie, & Edward M. Eyring. SBA-15-supported iron catalysts for Fischer-Tropsch production of diesel fuel. United States.
Dae Jung Kim, Brian C. Dunn, Frank Huggins, Gerald P. Huffman, Min Kang, Jae Eui Yie, and Edward M. Eyring. Fri . "SBA-15-supported iron catalysts for Fischer-Tropsch production of diesel fuel". United States. doi:.
@article{osti_20838266,
title = {SBA-15-supported iron catalysts for Fischer-Tropsch production of diesel fuel},
author = {Dae Jung Kim and Brian C. Dunn and Frank Huggins and Gerald P. Huffman and Min Kang and Jae Eui Yie and Edward M. Eyring},
abstractNote = {Iron supported on SBA-15, a mesoporous structured silica, has been developed as a catalyst for the Fischer-Tropsch synthesis of hydrocarbons. The catalysts retain the high surface area of the support, {approximately}500 m{sup 2}/g, average pore size, and pore volume. Inclusion of aluminum into the SBA-15 did not significantly alter these parameters. XRD, XAFS, and Moessbauer spectroscopies were used to characterize the catalyst before and after being subjected to the reaction conditions. Prior to reaction, the iron was distributed among {alpha}-Fe{sub 2}O{sub 3}, ferrihydrite, and minor {gamma}Fe{sub 2}O{sub 3}. After reaction, the iron phases detected were nonmagnetic iron oxides, iron carbide, and metallic iron. The length of the induction period typically seen with iron-based F-T catalysts was strongly dependent on the amount of aluminum present in the catalyst. With no aluminum, the induction period lasted about 25 h, whereas the induction period decreased to less than 5 h with an Al:Si mass ratio of 0.010. A further increase in aluminum content lengthened the induction period, but always remained less than that without aluminum. Catalyst activity and product selectivity were also strongly dependent on aluminum content with the maximum diesel fuel fraction, C{sub 11+}, occurring with the Al:Si ratio of 0.010 and a CO conversion of 37%. The small concentration of aluminum may serve to increase the rate of iron carbide formation, whereas higher concentrations may begin to inhibit the rate. 23 refs., 6 figs., 2 tabs.},
doi = {},
journal = {Energy and Fuels},
number = 6,
volume = 20,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}