Surface studies of the interaction of nickel and antimony on cracking catalysts
The metals' passivation mechanism of Phillips Petroleum Co.'s new fluidized cracking catalyst was studied with model systems, including a polycrystalline nickel-antimony alloy, unsupported nickel powders impregnated with antimony, cracking catalysts and other supports impregnated with high levels (5%) of nickel and antimony, and an equilibrium catalyst from a heavy oil cracker. X-ray diffraction and Auger spectroscopy were used. In the cracking catalyst, nickel apparently forms an alloy with antimony in which antimony segregates to the surface and poisons neighboring nickel atoms for hydrogen chemisorption. Nickel atoms are poisoned by both geometric blocking of sites and by alteration of their electronic properties.
- Research Organization:
- Phillips Pet. Co.
- OSTI ID:
- 6368997
- Report Number(s):
- CONF-800303-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 25:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ANTIMONY
CATALYSTS
CATALYTIC CRACKING
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
KINETICS
METALS
NICKEL
PETROLEUM
POISONING
PYROLYSIS
REACTION KINETICS
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
SURFACES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS