Mass-transport characteristics of zeolite cracking catalysts. Final report
Three series of experiments were undertaken in this investigation. In the first study we attempted to measure the intracrystalline diffusivities of a variety of alkanes and naphthenic hydrocarbons in zeolite NaY by the gas chromatography technique. The results were only partially successful. In the second investigation mixtures of two-, three-, and four-ring (naphthalene, phenanthrene, and pyrene) structures were hydrocracked over a nickel-tungsten sulfide ultrastable zeolite Y catalyst. The catalyst was very active in hydrocracking all three structures. At 371/sup 0/C and 10,440 kPa the pseudo first order rate constants (gm/hr/gm) for hydrocracking the two-, three- and four-ring mixtures were 14/6.2/2.8 respectively. In the third experimental investigation three molecular species (n-heptane, decalin, and 1-methyldecalin) of varying critical diameter were cracked over several acid faujasites (LaNaY, LaHY, MgHY, USY) of varying catalytic activity. For comparison purposes the hydrocarbons were also cracked over an amorphous silica-alumina catalyst. The experiments were carried out in a flow reactor in the presence of inert carrier (helium) at near atmospheric pressure and consequently the conditions more nearly approximate catalytic cracking conditions in contrast to the catalytic hydrocracking study described above. The naphthenic hydrocarbons were chosen for this study because it was demonstrated during preliminary work that the cracking kinetics was first order. Detailed reports of the three experiments are included in this final report.
- Research Organization:
- Mississippi Univ., University (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AC22-77ET10651
- OSTI ID:
- 6537860
- Report Number(s):
- DOE/ET/10651-1; FE-0651-1; ON: DE83003995
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BUTANE
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATOGRAPHY
CONDENSED AROMATICS
CRACKING
CYCLOALKANES
CYCLOHEXANE
DATA
DECALIN
DECOMPOSITION
DIFFUSION
DISPERSIONS
EXPERIMENTAL DATA
FAUJASITE
GAS CHROMATOGRAPHY
HEPTANE
HEXANE
HYDROCARBONS
HYDROCRACKING
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MASS TRANSFER
MATERIALS
METHANE
MINERALS
MIXTURES
NAPHTHALENE
NICKEL COMPOUNDS
NICKEL SULFIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHENANTHRENE
POROSITY
PYRENE
PYROLYSIS
SEPARATION PROCESSES
SILICA
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN SULFIDES
ZEOLITES