Kinetics of toluene hydrogenation on a supported Ni catalyst

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00013a006· OSTI ID:6764005

Lindfors, L P ^[1]; Salmi, T ^[2]

---

1. Neste Oy, Borga (Finland)
2. Lab. of Industrial Chemistry, Abo (Finland)

The gas-phase hydrogenation of toluene to methylcyclohexane was studied on a noncommercial supported nickel catalyst. The reaction kinetics were investigated in a differential reactor operating at atmospheric pressure and temperatures between 120 and 200 C. The results revealed that the hydrogenation kinetics is of the order 0.5-2 with respect to hydrogen and that the reaction order increases with temperature. The reaction order with respect to toluene increases from slightly negative values to zero order over the temperature domain studied. The kinetics was modeled with an empirical power-law rate expression and with two mechanistic rate models. The latter models were based on the assumption of rapid competitive adsorption steps of toluene and hydrogen and rate-determining surface reaction steps involving addition of hydrogen atom pairs to adsorbed toluene and partially hydrogenated intermediate molecules. The surface coverages, the activation energy, and the optimal reaction temperature giving the maximum reaction rate were estimated using parameter values obtained from one of the mechanistic models.

• OSTI ID: 6764005
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 32:1; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKANES
ALKYLATED AROMATICS
AROMATICS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CYCLOALKANES
ELEMENTS
ENERGY
HYDROCARBONS
HYDROGENATION
KINETICS
MATHEMATICAL MODELS
METALS
NICKEL
OPTIMIZATION
ORGANIC COMPOUNDS
REACTION KINETICS
SYNTHESIS
TEMPERATURE DEPENDENCE
TOLUENE
TRANSITION ELEMENTS