Role of ZSM-5 and ultrastable Y zeolites for increasing gasoline octane number

Journal Article · Wed May 01 00:00:00 EDT 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90030-8· OSTI ID:5750293

Madon, R J ^[1]

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1. Engelhard Corp., Edison, NJ (USA)

Octane number of gasoline made in a fluid catalytic cracker can be catalytically enhanced by using an ultrastable HY zeolite instead of one containing rare earth cations or by adding small amounts of ZSM-5 to a Y zeolite catalyst. ZSM-5 addition catalyzes both normal and branched olefin cracking to give mainly propylene, butenes, 2-methyl 1-butene, and 2-methyl 2-butene. Increase in octane number is mainly due to an increase in yields of C{sub 7}{sup +} paraffins and straight olefins. The decrease in paraffin yield is due to the removal of olefins which would otherwise undergo secondary hydrogen addition. The USY zeolite gives a lighter gasoline with higher yields of C{sub 5} and C{sub 6} branched olefins than the REY zoelite which gives higher yields of C{sub 7}{sup +} branched paraffins. However, the USY catalyst, unlike the ZSM-5 addition case, does not decrease the yields of C{sub 7}{sup +} olefins. Reaction pathways that affect gasoline composition are different for the two cases; yet, in both cases, increases in C{sub 5} hydrocarbons and decreases in C{sub 7}{sup +} paraffins contribute significantly to the increase in octane number.

• OSTI ID: 5750293
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 129:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
ALKENES
ANTIKNOCK RATINGS
AROMATICS
BUTENES
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASOLINE
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LIQUID FUELS
MATERIALS
METALS
MINERALS
OPTIMIZATION
ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM PRODUCTS
PROCESSING
PROPYLENE
PYROLYSIS
REFINING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
YIELDS
YTTRIUM
ZEOLITES