Coke and deactivation. I. Stoichiometry of coke formation in the catalytic reactions of n-hexene on USHY

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(90)90290-Z· OSTI ID:6352397

Groten, W A; Wojciechowski, B W ^[1]

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1. Queen's Univ., Kingston, Ontario (Canada)

Mechanistic studies of the reactions of n-hexene on USHY zeolite at 305 and 500{degree}C show the presence of alkyl cyclopentenes as primary products of reaction. The presence of such species, which are potential intermediates in the dehydrogenation process of the surface species, indicates that the reaction process which produces mononuclear and polynuclear aromatic species found in coke and in trace amounts in the desorbed phase, beings with a cyclization reaction of a saturated carbenium ion, followed by sequential dehydrogenation of the cyclic surface species. Detailed stoichiometry of the initial reaction mechanism reveals that the initial material detected as coke contains a range of molecular sizes. Small-chain species dominate the spectrum, accounting for over 80 mol% of the initial coke. This results in an average initial coke molecule of C{sub 5.1}H{sub 9.4}.

• OSTI ID: 6352397
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 122:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKENES
CATALYSIS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
CRACKING
CYCLOALKENES
DEACTIVATION
DECOMPOSITION
DEHYDROGENATION
DEPOSITION
HEXENES
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
PYROLYSIS
REACTION INTERMEDIATES
REACTION KINETICS
STOICHIOMETRY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
ZEOLITES