Catalytic coal liquefaction. Quarterly report, April-June 1983
The liquefaction of a bituminous coal has been studied in the presence of ammonium heptamolybdate catalyst added in the form of microcapsules. These were prepared by in-situ encapsulation of an emulsion of the molybdenum salt in tetralin. Average diameter of the polymeric microcapsules (resulting from reaction between a diisocyanate and a polyfunctional amine) was about 6 micrometers. Autoclave testing of the catalytic effect on liquefaction showed, both for coal conversion and hydrogen consumption, that at 450/sup 0/C the microencapsulated catalyst is at least as good as ammonium heptamolybdate preimpregnated on the coal aqueous solution, and far better than powdered ammonium heptamolybdate. Microencapsulated catalysts of this kind appear to offer some advantages of convenience in use, stability in storage, and flexibility. In comparison with the blank (Run 3), powdered AM at 400C is only marginally catalytic, whereas AM impregnated on coal is a good catalyst; these results are consonant with earlier research. Microencapsulated AM at 400C (tested at slightly lower loading) is not quite as active for either coal conversion or hydrogen consumption as the impregnated catalyst, though it is not far behind. It is possible that the polymer residues noted above at 400C have some deleterious effect on the catalyst. The microencapsulated AM is at least as good at 450C as the impregnated catalyst, and the index of hydrogen consumption indicates it to be even better than the impregnated one. The use of the encapsulated catalyst would offer the significant advantages of convenience (no necessity to impregnate powdered coal with aqueous solution and to dry), stability (the microencapsulated catalyst has an indefinitely long shelf life), and lower energy consumption (no need to evaporate large amounts of water).
- Research Organization:
- State Univ. of New York, Buffalo (USA)
- DOE Contract Number:
- FG22-81PC40781
- OSTI ID:
- 6010980
- Report Number(s):
- DOE/PC/40781-T7; ON: DE83015459
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
CHEMICAL PREPARATION
PERFORMANCE TESTING
COAL LIQUEFACTION
MOLYBDENUM
CATALYTIC EFFECTS
AUTOCLAVES
CONSUMPTION RATES
EXPERIMENTAL DATA
HYDROGEN
DATA
ELEMENTS
INFORMATION
LIQUEFACTION
METALS
NONMETALS
NUMERICAL DATA
SYNTHESIS
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction