Kinetics of catalytic cracking of n-paraffins on HY zeolite

Journal Article · Sun Mar 01 04:00:00 EST 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90338-1· OSTI ID:5322995

Abbot, J; Wojciechowski, B W

It is shown that the catalytic cracking of n-paraffins on HY zeolite must be described by a rate expression of the form, rate = A(1 - X)/(1 - B(1 - X)), where A and B are numerical parameters, and X is the fractional conversion of paraffin. This form is rigorously derived from fundamental principles by assuming a Langmuir type of adsorption process. Analysis of experimentally obtained parameters A and B shows that the cracking reaction of paraffins is strongly inhibited by product olefins, and that the determination of true kinetic rate constants will in general require a detailed knowledge of adsorption constants for both reactant and products. The rate of catalyst decay in paraffin cracking increases with increased chain length and exhibits kinetics suggestive of processes involving both two-site decay, as seen in cumene cracking, and multisite decay, assumed to involve pore blocking. The longer the feed molecule the more pronounced the decay attributable to pore blocking.

• Research Organization: Queen's Univ., Kingston, Ontario
• OSTI ID: 5322995
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 104:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
ALKENES
AROMATICS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CRACKING
CUMENE
DECOMPOSITION
DODECANE
EQUATIONS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETIC EQUATIONS
KINETICS
MATERIALS
MINERALS
OCTANE
ORGANIC COMPOUNDS
PYROLYSIS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
ZEOLITES