Development of unique catalysts for hydrodenitrogenation of coal-derived liquids. Annual report, September 15, 1978-September 14, 1979
Preliminary results from decahydroquinoline hydrodenitrogenation runs show that Bronsted acidity by itself will not catalyze carbon-nitrogen bond scission. The C-N bond cleavage must therefore be catalyzed by an active site, which consists of a transition metal ion in close proximity to an acid site. It appears that hydrodenitrogenation requires both an acidic and a basic site for the Hoffman E/sub 2/ elimination reaction to occur. Several catalysts have been prepared and tested, including Bronsted and Lewis acid catalysts without metal, and silica-alumina and ..gamma..-alumina impregnated with molybdenum, vanadium, nickel or iron. Our results show that the nitrogen removal rate was highest for molybdenum on ..gamma..-alumina catalyst and the rate decreased with lower Mo concentrations. Aluminum borate and aluminum borate phosphate catalysts (with or without nickel) were prepared to develop novel catalysts that would selectively coordinate the nitrogen atom and remove it without excessive hydrogenation. Results show that the support plays an important role in the nitrogen-removal process. Hydrodenitrogenation of aniline has been studied over a presulfided Ni-Mo/..gamma..-Al/sub 2/O/sub 3/ catalyst, and a reaction network has been proposed. Aniline hydrodenitrogenation appears to involve partial hydrogenation of the benzene ring to reduce aromatic resonance with the nitrogen atom, thus reducing the C-N bond strength and facilitating NH/sub 3/ elimination.
- Research Organization:
- Delaware Univ., Newark (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AS22-78ET03297
- OSTI ID:
- 6835756
- Report Number(s):
- DOE/ET/03297-1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of unique catalysts for hydrodenitrogenation of coal-derived liquids. Second quarterly report, December 15, 1978-March 15, 1979
Development of unique catalysts for hydrodenitrogenation of coal-derived liquids. Annual report, September 15, 1979-September 15, 1980
Related Subjects
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALUMINIUM COMPOUNDS
BORATES
BORON COMPOUNDS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL BONDS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CLEAVAGE
COAL LIQUIDS
CRYSTAL STRUCTURE
DATA
DENITRIFICATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
HYDROGENATION
INFORMATION
LIQUIDS
METALS
MICROSTRUCTURE
MOLYBDENUM
NICKEL
NUMERICAL DATA
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PROCESSING
REFINING
REFRACTORY METALS
STRUCTURAL MODELS
SYNTHESIS
TESTING
TRANSITION ELEMENTS