Hydrodesulfurization (HDS) poisoning by vanadium compounds: EPR and metal solid NMR analysis
The HDS activity of a commercial NiMo catalyst has been followed versus the amount of vanadium added to it, either by an oxidic procedure before the sulfidation step or by a sulfided route, using a highly soluble vanadyl porphyrin simulating the industrial process on the presulfided catalyst. An oxidative regeneration followed by a resulfidation transformed these porphyrin-poisoned catalysts into the oxidic preparation family. At the same time, Metal Solid NMR and EPR spectroscopies have been used to characterize the nature of the vanadium deposit. The very strong deactivation in the sulfided phase is due only to vanadyl species, well characterized by EPR; while the deactivation of the catalysts, where vanadium has been oxidized in V/sub 2/O/sub 5/, is due to vanadium sulfides, as is shown by NMR.
- Research Organization:
- Universite L. Pasteur, Strasbourg (France)
- OSTI ID:
- 5269503
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 106:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CARBOXYLIC ACIDS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DEACTIVATION
DEPOSITION
DESULFURIZATION
ELECTRON SPIN RESONANCE
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MAGNETIC RESONANCE
METALS
MOLYBDENUM
NICKEL
NUCLEAR MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM RESIDUES
POISONING
PORPHYRINS
REGENERATION
RESONANCE
SPECTROSCOPY
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM
VANADIUM COMPOUNDS
VANADIUM OXIDES
VANADIUM SULFIDES