Coal liquefaction with molybdenum catalysts
Coal liquefaction experiments were carried out in a stirred autoclave under nitrogen. Tetralin was employed as solvent, and the catalyst, when used, was ammonium heptamolybdate (impregnated on coal) or stannous chloride (powdered). Production of pentane soluble oil was higher in the runs with catalyst, but net hydrogen transfer from tetralin to coal was less when catalyst was used. Coal and powdered stannous chloride exhibited a marked synergistic effect on the dehydrogenation of tetralin. A free radical mechanism was suggested to explain this effect, and model experiments with bibenzyl (but no coal) gave results that were consistent with this mechanism. An apparent synergistic effect of coal and impregnated ammonium heptamolybdate was shown to be attributed simply to improved distribution (higher surface area) of the impregnated catalyst, the coal acting as a high-area support. Comparison of the results from autoclave experiments (under nitrogen) with those from tubing bomb experiments (under air) indicated major differences in coal conversion and hydrogen transfer. The conversion was 62% in the autoclave and 81% in the tubing bomb, and the hydrogen transfer was 0.7% in the autoclave and 2.93% in the tubing bomb, when 1% of Mo (based on coal) was impregnated on coal in a preliminary step.
- OSTI ID:
- 6142698
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic coal liquefaction. Quarterly report, October-December 1982
Catalytic coal liquefaction. Quarterly report, October-December 1981. [Ammonium molybdates]
Related Subjects
AMMONIUM COMPOUNDS
CATALYTIC EFFECTS
COAL LIQUEFACTION
CATALYSIS
MOLYBDATES
TIN CHLORIDES
BIBENZYL
SOLVENT EXTRACTION
TETRALIN
AROMATICS
CHLORIDES
CHLORINE COMPOUNDS
EXTRACTION
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
LIQUEFACTION
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
TIN COMPOUNDS
TIN HALIDES
TRANSITION ELEMENT COMPOUNDS
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