Catalyst dispersion and activity under conditions of temperature-staged liquefaction
Objectives of this research are to investigate the use of highly dispersed catalysts for the pretreatment of coal by mild hydrogenation, identification of the active forms of the catalysts and classification of the mechanisms of catalysis. The ultimate objective is to ascertain if mild catalytic hydrogenation resulting in very limited or no coal solubilization is an advantageous pretreatment for the transformation of coal into transportable fuels. The program will focus upon the development of effective methods of impregnating coal with catalysts, evaluating the conditions under which the catalysts are most active and establishing the relative impact of improved impregnation on conversion and product distributions obtained from coal hydrogenation. Some of the transformation and solubility characteristics of two catalysts have been investigated. The poor solubility of three separate lots of commercial ammonium tetrathiomolybdate (ATM) in water, THF and pyridine and their behavior during thermogravimetric analysis, suggested that quality control on synthesis of this material had been very poor. Because of this variability, we believe it may be more advantageous to prepare a sulfided ammonium molybdate catalyst in-house by reacting aqueous ammonium heptamolybdate with hydrogen sulfide. Thermogravimetric analysis and microautoclave experiments performed using ferrous sulfate in a nitrogen atmosphere demonstrated that decomposition to anhydrous ferrous sulfate occurs below 265{degrees}C and conversion to ferric oxide above 575{degrees}C. 6 refs., 3 figs.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC22-89PC89877
- OSTI ID:
- 7264021
- Report Number(s):
- DOE/PC/89877-1; ON: DE90008280
- Country of Publication:
- United States
- Language:
- English
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Catalyst dispersion and activity under conditions of temperature-staged liquefaction. Technical progress report, April--June 1990
Catalyst dispersion and activity under conditions of temperature-staged liquefaction
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM COMPOUNDS
CATALYTIC EFFECTS
COAL LIQUEFACTION
CATALYSTS
IRON COMPOUNDS
MOLYBDATES
MOLYBDENUM COMPOUNDS
SULFATES
CARBONYLS
CHEMICAL REACTION YIELD
DECOMPOSITION
HYDROGENATION
PROGRESS REPORT
PYRIDINE
SOLUBILITY
TEMPERATURE EFFECTS
TETRAHYDROFURAN
THERMAL GRAVIMETRIC ANALYSIS
WATER
AZINES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DOCUMENT TYPES
FURANS
GRAVIMETRIC ANALYSIS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
LIQUEFACTION
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PYRIDINES
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
SULFUR COMPOUNDS
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YIELDS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
400201 - Chemical & Physicochemical Properties