Development of unique catalysts for hydrodenitrogenation of coal-derived liquids. Ninth quarterly report, September 15, 1980-December 15, 1980
Catalysts have been prepared and tested with the emphasis on understanding the role of catalyst support on the carbon-nitrogen bond scission reaction. Hydrodenitrogenation of quinoline has been studied using catalysts containing Ni-Mo on several different supports, such as alumina, fluorided alumina, magnesia and titania. Preliminary results from this study indicate that the nitrogen removal activity of titania-supported catalysts is significantly higher than those with alumina or magnesia supports. This difference in activity is probably due to a strong interaction between molybdenum and titania. The basic magnesium oxide catalyst shows very little hydrodenitrogenation activity when compared to an acidic support. Based on these results, we can speculate that the hydrogenolysis site may involve an acidic group adjacent to the transition metal ion on the surface of the catalyst and that the C-N bond scission reaction occurs via a Hoffman E-2 (..beta..-elimination) process. Batch reactions of phenothiazine and an equimolar mixture of dibenzothiophene and acridine in the presence of sulfided CoO-MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ catalyst were performed at 573/sup 0/K and 7000 kPa. Results show an increased rate of phenothiazine hydrodesulfurization (HDS) over that for dibenzothiophene. The presence of acridine inhibits HDS of dibenzothiophene. These results appear to be contradictory to a mechanism involving one-point sulfur site coordination, but can be explained in terms of a multipoint coordination of reactant Pi electrons with catalytic sites. A complete reaction network for the HDS and subsequent hydrodenitrogenation of phenothiazine is presented.
- Research Organization:
- Delaware Univ., Newark (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AC22-78ET11429
- OSTI ID:
- 5220315
- Report Number(s):
- DOE/ET/11429-9; ON: DE82020154
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
CHEMICAL PREPARATION
PERFORMANCE TESTING
COAL LIQUIDS
DENITRIFICATION
HYDROGENATION
CHEMICAL BONDS
CLEAVAGE
COAL LIQUEFACTION
COMPARATIVE EVALUATIONS
DESULFURIZATION
EXPERIMENTAL DATA
QUINOLINES
REFINING
AZINES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
FLUIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
LIQUEFACTION
LIQUIDS
MICROSTRUCTURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PROCESSING
PYRIDINES
SYNTHESIS
TESTING
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010402 - Coal
Lignite
& Peat- Purification & Upgrading