Liquid Phase Hydrogenation of Naphthalene on Ni/Al2O3

Rautanen, Petri A.; Lylykangas, Mikko S.; Aittamaa, Juhani; Krause, A.O.I.

doi:10.1016/s0167-2991(01)81977-7

Cited by 12 publications

(34 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although not statistically significant, the removal of these parameters from the model visually affected the parity diagram and, hence, in the final regression these parameters were fixed at average values obtained during the regression procedure using various initial parameter guesses. The trend among the hydrocarbon chemisorption enthalpies indicates that naphthalene is more strongly bound to the surface than tetralin which is line with other hydrogenation studies of these molecules [47,48].…”

Section: Non-isothermal Regressionsupporting

confidence: 88%

Naphthalene hydrogenation over a NiMo/γ-Al2O3 catalyst: Experimental study and kinetic modelling

2008

View full text Add to dashboard Cite

Section: Non-isothermal Regressionsupporting

confidence: 88%

Naphthalene hydrogenation over a NiMo/γ-Al2O3 catalyst: Experimental study and kinetic modelling

2008

View full text Add to dashboard Cite

“…6,[19][20][21]38 Assuming dissociative hydrogen adsorption, as is always the case over Pt surfaces, the model results in the following expressions for the three reactions:…”

Section: Resultsmentioning

confidence: 99%

“…In those cases, the hydrogenation of TL was studied and fitted using three different models: power law, simplified L-H, and a mechanistic based model. 19 The hydrogenation of naphthalene 20 and mixtures of TL, naphthalene, and toluene 21 has been modeled using a simplified L-H-type expression. Alternatively, the kinetics of naphthalene and TL hydrogenation have been studied using a mechanistic-based model that features three possible types of adsorption modes of the aromatic on the active site.…”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Kinetic Studies of Tetralin Hydrogenation on Pt/Alumina

Santana

Jongpatiwut

Alvarez

et al. 2005

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The hydrogenation of aromatic compounds is a reaction of relevance in the improvement of diesel fuel quality. In this work, the kinetics of tetralin (1,2,3,4-tetrahydronaphthalene) hydrogenation over Pt/Al 2 O 3 catalysts have been studied in an integral fixed bed reactor at 500 psig in the temperature range 553-573 K. A semiempirical Langmuir-Hinshelwood equation has been used to model the kinetics. The values of the kinetic parameters were determined by a nonlinear fitting, while the heats of adsorption for the hydrocarbons involved (tetralin and cis-and transdecalin) were experimentally obtained by temperature-programmed desorption. The adsorption competition between tetralin and the hydrogenated products (cis-and trans-decalin) for surface active sites can be quantitatively traced to the higher heat of adsorption of tetralin compared to those of cis-and trans-decalins. As a result, while the activation energy for the cis-trans isomerization is significantly lower than the one for tetralin hydrogenation and its intrinsic reaction rate much higher than that of hydrogenation, the isomerization reaction can only be observed when the concentration of tetralin in the gas phase is very much reduced. In consequence, at low conversions, the trans/cis ratio remains unchanged, and it only increases to its equilibrium value at very high tetralin conversions.

show abstract

“…Apparatus. The hydrogenations of naphthalene and tetralin were performed in a Robinson−Mahoney reactor working in CSTR mode and equipped with static catalyst basket and magnetic stirrer. , Continuous gas and liquid feeds were introduced into the isothermally operated reactor, and the mixture of gas and liquid products was withdrawn from the reactor. The products were flashed at room temperature at the reactor pressure, and the liquid product was analyzed with a gas chromatograph with a fused silica capillary column and a flame ionization detector.…”

Section: Methodsmentioning

confidence: 99%

“…Temperature was varied from 80 to 160 °C, the hydrogen pressure from 20 to 40 bar, and the concentration of aromatics from 1 to 15 mol %. The hydrogenation procedure and process parameters are described in more detail in our earlier papers. , …”

Section: Methodsmentioning

confidence: 99%

Liquid-Phase Hydrogenation of Naphthalene and Tetralin on Ni/Al₂O₃: Kinetic Modeling

Rautanen

Lylykangas

Aittamaa

et al. 2002

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The kinetics of the liquid-phase hydrogenation of naphthalene and tetralin (1,2,3,4-tetrahydronaphthalene) in decane was studied on a commercial nickel catalyst at 80−160 °C and 20−40 bar in a CSTR. The proposed kinetic model assumes three adsorption modes (π-, π/σ-, and σ-adsorption), of which two are associative and one is dissociative. The associatively adsorbed aromatic compounds are assumed to be active in hydrogenation, whereas the dissociative adsorption leads to coke formation. Moreover, it is proposed that naphthalene adsorption occurs on a single active site, whereas tetralin adsorption requires an ensemble of Ni atoms. This explains the nonlinear decrease in the tetralin hydrogenation rate with catalyst deactivation, whereas the naphthalene hydrogenation decreases linearly. The proposed reaction and deactivation mechanism is able to describe the main features of the observed kinetics, including the formation of octalins (octahydronaphthalene), changes in the cis-to-trans selectivity of decalin (decahydronaphthalene), and the difference between the naphthalene and tetralin hydrogenation and deactivation rates.

show abstract

Liquid Phase Hydrogenation of Naphthalene on Ni/Al2O3

Cited by 12 publications

References 12 publications

Naphthalene hydrogenation over a NiMo/γ-Al2O3 catalyst: Experimental study and kinetic modelling

Naphthalene hydrogenation over a NiMo/γ-Al2O3 catalyst: Experimental study and kinetic modelling

Gas-Phase Kinetic Studies of Tetralin Hydrogenation on Pt/Alumina

Liquid-Phase Hydrogenation of Naphthalene and Tetralin on Ni/Al₂O₃: Kinetic Modeling

Contact Info

Product

Resources

About

Liquid Phase Hydrogenation of Naphthalene on Ni/Al2O3

Cited by 12 publications

References 12 publications

Naphthalene hydrogenation over a NiMo/γ-Al2O3 catalyst: Experimental study and kinetic modelling

Naphthalene hydrogenation over a NiMo/γ-Al2O3 catalyst: Experimental study and kinetic modelling

Gas-Phase Kinetic Studies of Tetralin Hydrogenation on Pt/Alumina

Liquid-Phase Hydrogenation of Naphthalene and Tetralin on Ni/Al2O3: Kinetic Modeling

Contact Info

Product

Resources

About

Liquid-Phase Hydrogenation of Naphthalene and Tetralin on Ni/Al₂O₃: Kinetic Modeling