Mass transport characteristics of zeolite cracking catalysts. Quarterly report, January 1-March 31, 1979

Technical Report · Mon May 14 04:00:00 EDT 1979

DOI:https://doi.org/10.2172/5785236· OSTI ID:5785236

Haynes, Jr., H. W.

An active zeolite hydrocracking catalyst has been prepared by ion exchanging Ni/sup + +/ onto an ammonium ultrastable zeolite Y and then impregnating the resulting catalyst with tungsten. A mixture of hydrogenated phenanthrenes were hydrocracked over this catalyst in a trickle bed reactor over a range of conditions: P = 1500 to 2000 psi, T = 650 to 750/sup 0/F, SV = 0.5 to 3.0 gm/hr/gm. Operability was generally good for the entire 131 hour run duration. The products will be analyzed by gas chromatography with selected products analyzed by GC/MS. A kinetics model has been developed for the simulated catalytic cracking of various pure hydrocarbons over zeolite NaY. Over the range of concentrations studied, hydrogenation prevails over cracking for partially saturated species like tetralin. The opposite is true for totally saturated naphthenic species such as decalin. However, the kinetic model predicts a higher selectivity toward cracking in a 100% vapor phase (no carrier gas) environment at atmospheric pressure. Tests are underway to check this prediction experimentally. From the magnitude of the activation energies and the relative activities for conversion over NaA and NaY, there does not appear to be any evidence of a pore diffusion limitation for the 3-ring and smaller components studied. (This conclusion may not apply to conventional catalytic cracking processes, however, since the conversion rates over NaY are orders of magnitude smaller than rates over acid forms of the zeolite.) Unexplained discrepancies still exist between theory and experiment in the GC-diffusivity studies on the system n-butane/NaY. Further tests are planned to check the linearity assumptions inherent in the model.

• Research Organization: Mississippi Univ., University (USA). Dept. of Chemical Engineering
• OSTI ID: 5785236
• Report Number(s): FE-2727-6
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALKANES
AROMATICS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHROMATOGRAPHY
CONDENSED AROMATICS
CRACKING
CYCLOALKANES
DATA
DATA FORMS
DECALIN
DECOMPOSITION
ELEMENTS
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
GRAPHS
HYDROCARBONS
HYDROCRACKING
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATHEMATICAL MODELS
METALS
MINERALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
PHENANTHRENE
PYROLYSIS
SEPARATION PROCESSES
SPECIFICITY
TABLES
TETRALIN
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
ZEOLITES