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Title: DEVELOPMENT OF PRECIPITATED IRON FISCHER-TROPSCH CATALYSTS

Abstract

Despite the current worldwide oil glut, the US will ultimately require large-scale production of liquid (transportation) fuels from coal. Slurry phase Fischer-Tropsch (F-T) technology, with its versatile product slate, may be expected to play a major role in production of transportation fuels via indirect coal liquefaction. Some of the F-T catalysts synthesized and tested at Texas A and M University under DOE Contract No. DE-AC22-89PC89868 were more active than any other known catalysts developed for maximizing production of high molecular weight hydrocarbons (waxes). The objectives of the present contract were to demonstrate repeatability of catalyst performance and reproducibility of preparation procedures of two of these catalysts on a laboratory scale. Improvements in the catalyst performance were attempted through the use of: (a) higher reaction pressure and gas space velocity to maximize the reactor productivity; (b) modifications in catalyst preparation steps; and (c) different pretreatment procedures. Repeatability of catalyst performance and reproducibility of catalyst synthesis procedure have been successfully demonstrated in stirred tank slurry reactor tests. Reactor space-time-yield was increased up to 48% by increasing reaction pressure from 1.48 MPa to 2.17 MPa, while maintaining the gas contact time and synthesis gas conversion at a constant value. Use of calcination temperaturesmore » above 300 C, additional CaO promoter, and/or potassium silicate as the source of potassium promoter, instead of potassium bicarbonate, did not result in improved catalyst performance. By using different catalyst activation procedures they were able to increase substantially the catalyst activity, while maintaining low methane and gaseous hydrocarbon selectivities. Catalyst productivity in runs SA-0946 and SA-2186 was 0.71 and 0.86 gHC/g-Fe/h, respectively, and this represents 45-75% improvement in productivity relative to that achieved in Rheinpreussen's demonstration plant unit (the most successful bubble column slurry reactor performance to date), and sets new standards of performance for ''high alpha'' iron catalysts.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Texas A& M University (US)
Sponsoring Org.:
(US)
OSTI Identifier:
808495
DOE Contract Number:  
AC22-94PC93069
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 22 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 03 NATURAL GAS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CATALYSTS; COAL LIQUEFACTION; DEMONSTRATION PLANTS; IRON; METHANE; MODIFICATIONS; MOLECULAR WEIGHT; POTASSIUM SILICATES; SLURRY REACTORS; SYNTHESIS GAS

Citation Formats

Dr. Dragomir B. Bukur, Dr. X. Lang, Dr. S. Chokkaram, Dr. L. Nowicki, G. Wei, Dr. Y. Ding, Dr. B. Reddy, and Dr. S. Xiao. DEVELOPMENT OF PRECIPITATED IRON FISCHER-TROPSCH CATALYSTS. United States: N. p., 1999. Web. doi:10.2172/808495.
Dr. Dragomir B. Bukur, Dr. X. Lang, Dr. S. Chokkaram, Dr. L. Nowicki, G. Wei, Dr. Y. Ding, Dr. B. Reddy, & Dr. S. Xiao. DEVELOPMENT OF PRECIPITATED IRON FISCHER-TROPSCH CATALYSTS. United States. doi:10.2172/808495.
Dr. Dragomir B. Bukur, Dr. X. Lang, Dr. S. Chokkaram, Dr. L. Nowicki, G. Wei, Dr. Y. Ding, Dr. B. Reddy, and Dr. S. Xiao. Thu . "DEVELOPMENT OF PRECIPITATED IRON FISCHER-TROPSCH CATALYSTS". United States. doi:10.2172/808495. https://www.osti.gov/servlets/purl/808495.
@article{osti_808495,
title = {DEVELOPMENT OF PRECIPITATED IRON FISCHER-TROPSCH CATALYSTS},
author = {Dr. Dragomir B. Bukur and Dr. X. Lang and Dr. S. Chokkaram and Dr. L. Nowicki and G. Wei and Dr. Y. Ding and Dr. B. Reddy and Dr. S. Xiao},
abstractNote = {Despite the current worldwide oil glut, the US will ultimately require large-scale production of liquid (transportation) fuels from coal. Slurry phase Fischer-Tropsch (F-T) technology, with its versatile product slate, may be expected to play a major role in production of transportation fuels via indirect coal liquefaction. Some of the F-T catalysts synthesized and tested at Texas A and M University under DOE Contract No. DE-AC22-89PC89868 were more active than any other known catalysts developed for maximizing production of high molecular weight hydrocarbons (waxes). The objectives of the present contract were to demonstrate repeatability of catalyst performance and reproducibility of preparation procedures of two of these catalysts on a laboratory scale. Improvements in the catalyst performance were attempted through the use of: (a) higher reaction pressure and gas space velocity to maximize the reactor productivity; (b) modifications in catalyst preparation steps; and (c) different pretreatment procedures. Repeatability of catalyst performance and reproducibility of catalyst synthesis procedure have been successfully demonstrated in stirred tank slurry reactor tests. Reactor space-time-yield was increased up to 48% by increasing reaction pressure from 1.48 MPa to 2.17 MPa, while maintaining the gas contact time and synthesis gas conversion at a constant value. Use of calcination temperatures above 300 C, additional CaO promoter, and/or potassium silicate as the source of potassium promoter, instead of potassium bicarbonate, did not result in improved catalyst performance. By using different catalyst activation procedures they were able to increase substantially the catalyst activity, while maintaining low methane and gaseous hydrocarbon selectivities. Catalyst productivity in runs SA-0946 and SA-2186 was 0.71 and 0.86 gHC/g-Fe/h, respectively, and this represents 45-75% improvement in productivity relative to that achieved in Rheinpreussen's demonstration plant unit (the most successful bubble column slurry reactor performance to date), and sets new standards of performance for ''high alpha'' iron catalysts.},
doi = {10.2172/808495},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}