Ni poisoning of FCC catalysts: A model study
- Inst. Francais de Petrole, Rueil Malmaison (France)
Metal poisoning of FCC catalysts by nickel is a major industrial problem; the deposition of this metal leads to a severe increase of hydrogen and coke yields. In this work Ni poisoning has been studied on silica, alumina, silica-aluminas, magnesia, kaolin and various forms of Y zeolites, by XRD, CTEM, STEM, TPR and ESCA. The toxicity of Ni deposited on these model phases has been evaluated by MAT tests using a VGO as a feed. Results can be summarized as follows: The alumina-rich supports favor the formation of nickel aluminate-like species. The combined nickel is characterized by a high dispersion and a low reducibility. Conversely silica-rich supports favor the formation of nickel oxide particles reducible at low temperature. As expected the MAT tests confirm that Ni deposited on model phases behaves as a dehydrogenating agent, i.e. increases coke and hydrogen productions. Moreover this dehydrogenation activity mainly depends on the aluminum content of the solids. Indeed on silica no real nickel toxicity is clearly observed; Ni exhibits the highest toxicity when combined with alumina or extraframework material present in modified zeolites.
- OSTI ID:
- 6969214
- Report Number(s):
- CONF-900802--
- Journal Information:
- American Chemical Society, Division of Petroleum Chemistry, Preprints; (United States), Journal Name: American Chemical Society, Division of Petroleum Chemistry, Preprints; (United States) Vol. 35:4; ISSN 0569-3799; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COKE
CONTROL
CRACKING
DECOMPOSITION
DEHYDROGENATION
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
MICROSCOPY
MINERALS
NICKEL
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
POISONING
PYROLYSIS
REDUCTION
SCANNING ELECTRON MICROSCOPY
SCATTERING
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZEOLITES