Effect of exchange cations and silica to alumina ratio of faujasite on coke selectivity during fluid catalytic cracking

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90253-3· OSTI ID:5327558

Rajagopalan, K; Peters, A W

Hydrothermally treated fluid-cracking catalysts containing zeolites of varying chemical composition were used in cracking experiments with commercial gas oils and a model hydrocarbon compound. An observed linear relationship between coke yields for a given catalyst and a second-order kinetic conversion parameter was used to assess coke selectivity as a function of zeolite composition as measured by the unit cell constant. Coke selectivity was sensitive to the unit cell constant in the 24.57- to 24.33-A range. Both parallel and consecutive coking reactions were suppressed in the presence of the smaller unit cell zeolite catalyst. Below 24.33 A, coke selectivity was less sensitive to the unit cell constant. Exchange cations like sodium and mixed rare earths did not independently influence coke selectivity at a given unit cell constant. Reduction in coke selectivity for the zeolites with smaller unit cell constants can be attributed to the lower density of acid sites in those zeolites.

• Research Organization: W.R. Grace and Co., Columbia, MD (USA)
• OSTI ID: 5327558
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 106:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
COMPARATIVE EVALUATIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS OILS
HYDROGEN TRANSFER
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PYROLYSIS
RARE EARTHS
REACTION KINETICS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SODIUM
SYNTHESIS
THERMOCHEMICAL PROCESSES
ZEOLITES