Comparison of the performance of ZSM-5, [beta] zeolite, Y, USY, and their composites in the catalytic cracking of n-octane, 2,2,4-trimethylpentane, and 1-octene

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00028a004· OSTI ID:7203987

Smirniotis, P G; Ruckenstein, E ^[1]

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1. State Univ. of New York, Buffalo, NY (United States). Dept. of Chemical Engineering

The cracking of n-octane, 2,2,4-trimethylpentane, and 1-octene was examined over ZSM-5, [beta] zeolite, Y, USY, and the composites of any of the two former zeolites as additives to the latter two traditional cracking zeolites, under high-severity conditions, namely relatively high temperatures (500 C) and high conversions. The behaviors of these catalysts under the above conditions are very different from those already studied in the literature, which have been at low conversion and lower temperature. While for the latter conditions the selectivities for olefins were higher and for aromatics lower over ZSM-5 than over Y faujasite, in the present conditions the above trends are inverted. The shifting in the rates of primary cracking, hydrogen transfer, oligomerization, and bimolecular condensation cracking reactions produced by the changes in the zeolite employed and conditions are responsible for this behavior. For the composites of Y faujasite with either ZSM-5 or [beta] zeolite the C[sub 3] and C[sub 4] paraffin selectivities can be calculated as the weighted averages of those for the individual zeolites. In contrast, for the USY zeolite based composites, the additivity rule is not always obeyed, and the selectivities for C[sub 3] and C[sub 4] paraffins can be larger than those over the individual zeolites.

• OSTI ID: 7203987
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:4; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
ALKENES
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRACKING
DECOMPOSITION
EVALUATION
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
OCTANE
OCTENES
ORGANIC COMPOUNDS
PERFORMANCE TESTING
PYROLYSIS
SILICATE MINERALS
TESTING
THERMOCHEMICAL PROCESSES
ZEOLITES