Catalyst dispersion and activity under conditions of temperature- staged liquefaction. Technical progress report, January--March 1992
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.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-89PC89877
- OSTI ID:
- 10160580
- Report Number(s):
- DOE/PC/89877-10; ON: DE92017296
- Resource Relation:
- Other Information: PBD: Jul 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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