Kinetics of the gas-phase catalytic isomerization of xylenes

Journal Article · Mon Dec 31 23:00:00 EST 1979 · Ind. Eng. Chem. Process Des. Dev.; (United States)

DOI:https://doi.org/10.1021/i260074a011· OSTI ID:6360579

Corma, A; Cortes, A

The kinetics of the gas-phase catalytic isomerization of xylenes in the presence of hydrogen were studied in a fixed-bed flow reactor over a bifunctional silica-alumina-supported 4 3< Ni catalyst at 400/sup 0/-465/sup 0/C and a total pressure of up to 3.95 kg/sq cm. The experimental data were used to calculate the kinetic rate constants and activation energies for each isomerization reaction involved in the consecutive mechanism proposed earlier The calculated activation-energy values suggested that the hydrogenating function, i.e., the nickel component, of the catalyst is responsible for catalyst stability but not for the isomerization reactions. A mathematical model was developed, which accurately predicted the experimental product distributions at up to equilibrium conversion in an isothermal reactor packed with powdered catalyst. By introducing an effectiveness factor accounting for diffusion limitations, this model was extended to pelletized catalysts.

• Research Organization: Inst. Catal. Petroleoquim. Madrid
• OSTI ID: 6360579
• Journal Information: Ind. Eng. Chem. Process Des. Dev.; (United States), Journal Name: Ind. Eng. Chem. Process Des. Dev.; (United States) Vol. 19:2; ISSN IEPDA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
ALKYLATED AROMATICS
AROMATICS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
ISOMERIZATION
KINETICS
MATHEMATICAL MODELS
METALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
REACTION KINETICS
TRANSITION ELEMENTS
XYLENES