Denitrogenation of piperidine on alumina, silica, and silica-aluminas: The effect of surface acidity
- Univ. of Louisville, KY (United States)
Alumina, silica, and three silica-aluminas having 10, 50 and 90 wt% SiO{sub 2} were prepared and characterized for the total acidity, acid strength distribution, and Broensted/Lewis acidity. The characterization involved the techniques of ammonia chemisorption, temperature-programmed desorption (TPD), and FT-IR spectroscopy. The effect of surface acidity on denitrogenation selectivity was studied by means of the reactions of piperidine in a continuous-flow fixed-bed reactor operated at atmospheric pressure and 320-340 C. The overall piperidine conversion to various products increases with the total acidity of the catalysts. However, the denitrogenation selectivity depends only on the concentration of Broensted acid sites, demonstrating the participation of those sites in the deamination mechanism and hence showing evidence for the Hofmann elimination pathway. The other important reactions of piperidine were alkylation, condensation, disproportionation, and dehydrogenation, to yield alkylpiperidiens, 2,3,4,5-tetrahydropyridine, pyridine, 1,2,3,4-tetrahydroquinoline, 1,2,3,4-tetrahydro-3-methylquinoline, 5,6,7,8-tetrahydroquinoline, and decahydroquinoline.
- DOE Contract Number:
- FG22-89PC89771
- OSTI ID:
- 7106523
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 137:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ABSORPTION SPECTROSCOPY
ALKYLATION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMINES
AMMONIA
AROMATICS
AZAARENES
AZINES
BROENSTED ACIDS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CONTROL
DEAMINATION
DEHYDROCYCLIZATION
DEHYDROGENATION
DENITRIFICATION
DESORPTION
DISSOCIATION
ELECTROMAGNETIC RADIATION
FOURIER TRANSFORMATION
FUELS
HETEROCYCLIC COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
INFRARED RADIATION
INORGANIC ACIDS
INTEGRAL TRANSFORMATIONS
LEWIS ACIDS
LIQUID FUELS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PIPERIDINES
PROCESSING
PYRIDINES
QUINOLINES
RADIATIONS
REFINING
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE CONTROL
TRANSFORMATIONS