Hydrothermal aging of cracking catalysts: V. Vanadium passivation by rare-earth compounds soluble in the feedstock
- Inst. de Recherches sur la Catalyse, Cedex (France)
- TOTAL Research Center, Harfleur (France)
This study was designed to passivate vanadium on an ultrastable Y zeolite-based FCC catalyst. The passivating agents are rare-earth compounds soluble in hydrocarbons (dysprosium and samarium naphthenate, lanthanum octoate) which are introduced on the catalyst at the same time as vanadium naphthenate. Adsorption measurements show that more than 90% of the zeolite structure is preserved after high-temperature hydrothermal treatments when La/V = 1. High-resolution analytical microscopy shows that vanadates (SmVO[sub 4], LaVO[sub 4]), in the form of small particles, are formed on the surface of the catalyst grains on the matrix and both on the external surface and in the mesopores of the zeolite. The gasoline yield measured with a microactivity cracking test is maintained at a high level, but coke and hydrogen yields remain higher than those on an unpoisoned catalyst.
- OSTI ID:
- 6994222
- Journal Information:
- Journal of Catalysis; (United States), Vol. 134:2; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
PASSIVATION
PETROLEUM
CATALYTIC CRACKING
ADSORPTION
AGING
CHEMICAL REACTION YIELD
COKE
DYSPROSIUM COMPOUNDS
GASOLINE
LANTHANUM COMPOUNDS
MICROSCOPY
MITIGATION
POISONING
SAMARIUM COMPOUNDS
SYNTHESIS
VANADATES
VANADIUM
VANADIUM COMPOUNDS
ZEOLITES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LIQUID FUELS
MATERIALS
METALS
MINERALS
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PYROLYSIS
RARE EARTH COMPOUNDS
SILICATE MINERALS
SORPTION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
020400* - Petroleum- Processing