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Title: Catalyst dispersion and activity under conditions of temperature- staged liquefaction. Technical progress report, January--March 1992

Abstract

Two coals, a Texas subbituminous C and a Utah high volatile A bituminous, were used to examine the effects of solvent swelling and catalyst impregnation on liquefaction conversion behavior in temperature staged reactions for 30 minutes each at 275{degree} and 425{degree}C in H{sub 2} and 95:5 H{sub 2}:H{sub 2}S atmospheres. Methanol, pyridine, tetrahydrofuran, and tetrabutylammonium hydroxide were used as swelling agents. Molybdenum-based catalyst precursors were ammonium tetrathiomolybdate, molybdenum trisulfide, molybdenum hexacarbonyl, and bis(tricarbonylcyclopentadienyl-molybdenum). Ferrous sulfate and bis(dicarbonylcyclo-pentadienyliron) served as iron-based catalyst precursors. In addition, ion exchange was used for loading iron onto the subbituminous coal. For most experiments, liquefaction in H{sub 2}:H{sub 2}S was superior to that in H{sub 2}, regardless of the catalyst precursor. The benefit of the H{sub 2}S was greater for the subbituminous, presumably because of its higher iron content relative to the hvab coal. Tetrabutylammonium hydroxide was the only swelling agent to enhance conversion of the hvab coal significantly; it also caused a remarkable increase in conversion of the subbituminous coal. The combined application of solvent swelling and catalyst impregnation also improves liquefaction, mainly through increased oil yields from the hvab coal and increased asphaltenes from the subbituminous. A remarkable effect from use of ammonium tetrathiomolybdatemore » as a catalyst precursor is substantial increase in pristane and phytane yields. Our findings suggest that these compounds are, at least in part, bound to the coal matrix.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10160580
Report Number(s):
DOE/PC/89877-10
ON: DE92017296
DOE Contract Number:  
AC22-89PC89877
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1992
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL LIQUEFACTION; CATALYSTS; COMPARATIVE EVALUATIONS; BITUMINOUS COAL; SWELLING; SUBBITUMINOUS COAL; IRON; CATALYTIC EFFECTS; MOLYBDENUM; PROGRESS REPORT; TEMPERATURE RANGE 0400-1000 K; MEDIUM PRESSURE; EXPERIMENTAL DATA; HYDROGEN; HYDROGEN SULFIDES; IRON SULFATES; MOLYBDENUM COMPOUNDS; CARBONYLS; TEMPERATURE EFFECTS; PYRIDINES; METHANOL; TETRAHYDROFURAN; 010405; HYDROGENATION AND LIQUEFACTION

Citation Formats

Davis, A, Schobert, H H, Mitchell, G D, and Artok, L. Catalyst dispersion and activity under conditions of temperature- staged liquefaction. Technical progress report, January--March 1992. United States: N. p., 1992. Web. doi:10.2172/10160580.
Davis, A, Schobert, H H, Mitchell, G D, & Artok, L. Catalyst dispersion and activity under conditions of temperature- staged liquefaction. Technical progress report, January--March 1992. United States. https://doi.org/10.2172/10160580
Davis, A, Schobert, H H, Mitchell, G D, and Artok, L. 1992. "Catalyst dispersion and activity under conditions of temperature- staged liquefaction. Technical progress report, January--March 1992". United States. https://doi.org/10.2172/10160580. https://www.osti.gov/servlets/purl/10160580.
@article{osti_10160580,
title = {Catalyst dispersion and activity under conditions of temperature- staged liquefaction. Technical progress report, January--March 1992},
author = {Davis, A and Schobert, H H and Mitchell, G D and Artok, L},
abstractNote = {Two coals, a Texas subbituminous C and a Utah high volatile A bituminous, were used to examine the effects of solvent swelling and catalyst impregnation on liquefaction conversion behavior in temperature staged reactions for 30 minutes each at 275{degree} and 425{degree}C in H{sub 2} and 95:5 H{sub 2}:H{sub 2}S atmospheres. Methanol, pyridine, tetrahydrofuran, and tetrabutylammonium hydroxide were used as swelling agents. Molybdenum-based catalyst precursors were ammonium tetrathiomolybdate, molybdenum trisulfide, molybdenum hexacarbonyl, and bis(tricarbonylcyclopentadienyl-molybdenum). Ferrous sulfate and bis(dicarbonylcyclo-pentadienyliron) served as iron-based catalyst precursors. In addition, ion exchange was used for loading iron onto the subbituminous coal. For most experiments, liquefaction in H{sub 2}:H{sub 2}S was superior to that in H{sub 2}, regardless of the catalyst precursor. The benefit of the H{sub 2}S was greater for the subbituminous, presumably because of its higher iron content relative to the hvab coal. Tetrabutylammonium hydroxide was the only swelling agent to enhance conversion of the hvab coal significantly; it also caused a remarkable increase in conversion of the subbituminous coal. The combined application of solvent swelling and catalyst impregnation also improves liquefaction, mainly through increased oil yields from the hvab coal and increased asphaltenes from the subbituminous. A remarkable effect from use of ammonium tetrathiomolybdate as a catalyst precursor is substantial increase in pristane and phytane yields. Our findings suggest that these compounds are, at least in part, bound to the coal matrix.},
doi = {10.2172/10160580},
url = {https://www.osti.gov/biblio/10160580}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 1992},
month = {Wed Jul 01 00:00:00 EDT 1992}
}