The Kinetics of the Cracking of Cumene by Silica-Alumina Catalysts

Prater, C. D.; Lago, R.M.

doi:10.1016/s0360-0564(08)60543-x

Cited by 49 publications

(19 citation statements)

References 9 publications

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“…1 ) it can be deduced that, under our experimental conditions, the system can be described in accordance with Bassett and Habgood's postulates as first-order kinetics, r = kP,,, the rate-controlling step being the surface reaction (15). From this, the cracking of alkylaromatic hydrocarbons with our catalyst appears to follow a kinetic scheme analogous to that proposed by Prater and Lago (4). verified by other authors for other kinds of cracking catalysts (3, 5 , 6, 16, 17).…”

Section: -X Fsupporting

confidence: 79%

The catalytic cracking of arènes on SiO₂–AlPO₄ catalysts. A study of the mechanism

Deyà¹,

Costa²,

Sinisterra³

et al. 1982

Can. J. Chem.

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P. M. DEYA, A. COSTA, J. V. SINISTERRA, and J. M. MARINAS. Can. J. Chem. 60, 35 (1982). The catalytic protodealkylation mechanism of arenes (R-Ph), using a SiO,-AIPO, catalyst has been studied using the microcatalytic pulse technique. Two hydrocarbon series were used: normal series (R = Me, Et, n-Pr, and 11-Bu) and a-methylated series (R = Me, Et, i-Pr, and t-Bu). In all cases it was shown that the process may be described by means of Bassett-Habgood's kinetics. That is to say, the process is a first order reaction ( r = kPH,) where the rate-controlling step is the surface reaction.Real activation energies of the superficial process have been determined, all results showing values of the same order within the experimental error, which indicates that the transition state is the same for all alkylbenzenes because all the kinetics are first order.Correlations between kinetic constants and electrical (o*) and steric (E,) parameters have been sought. The best are obtained when values for the cc-methylated series are plotted against o* and those for the normal series against E,.A possible reaction pathway of the S,2 (Ad-E) type is proposed. On a determine les energies reelles d'activation de la reaction de surface. Tous les resultats donnent des vaieurs apant le mSme ordre de grandeur a I'interieur des erreurs experimentales. ce qui signifie que I'etat de transition est le m6me pour tous les alkylbenzenes parce que toutes les cinetiques sont d'ordre un. On a cherche a etablir des correlations entre les constantes cinetiques et les parametres electrique (o*) et sterique (E,). On a obtenu les meilleures correlations en tracant des courbes des valeurs des series cc methylees en fonction de o * et celles des series normales en fonction de E,.

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Section: -X Fsupporting

confidence: 79%

The catalytic cracking of arènes on SiO₂–AlPO₄ catalysts. A study of the mechanism

Deyà¹,

Costa²,

Sinisterra³

et al. 1982

Can. J. Chem.

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“…Over the years, Voorhies's work gained increasing support as evidenced by the number of investigators that have reported a good agreement between (1) and experimentally measured coke deposition rates (e.g., Rudershausen and Watson, 1954;Prater and Lago, 1956;Wilson and Den Herder, 1958;Andrews, 1959;Butt et al, 1975). Over the years, Voorhies's work gained increasing support as evidenced by the number of investigators that have reported a good agreement between (1) and experimentally measured coke deposition rates (e.g., Rudershausen and Watson, 1954;Prater and Lago, 1956;Wilson and Den Herder, 1958;Andrews, 1959;Butt et al, 1975).…”

Section: Introductionmentioning

confidence: 95%

Analysis of zeolite catalyst deactivation during catalytic cracking reactions

Reyes¹,

Scriven²

1991

Ind. Eng. Chem. Res.

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Herman, R. G.; Klier, K. Reaction Kinetics of the Higher Alcohol and Oxygenate Synthesis over Cesium Doped Cu/ZnO Catalysta. Znd. Eng. Chem. Res. 1990, to be submitted. Tronconi, E.; Ferlazzo, N.; Forzatti, P.; Pasquon, I. Synthesis ofCatalyst deactivation during cracking reactions is analyzed in terms of the physical, chemical, and transport processes taking place within zeolite crystals. Special attention is given to the interactions of zeolite morphology and the wide range of components present in a typical cracking feed. By analyzing the functional form of activity decays, obtained via a detailed model of adsorption, diffusion, and reaction, it is possible to identify three regimes of deactivation. These can be classified as dynamical, chemical, and structural. They dominate the shape of the activity decay curves at short, intermediate, and longer times, and are related to competitive adsorption, site coverage, and pore blockage phenomena, respectively. The model predicts the correct activity patterns under a wide variety of reaction conditions, closely mimics those observed experimentally, and spans those obtained from available empirical correlations.0888.58851 91 / 2630-0071$02.50/0 -0 1991 American Chemical Societv

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“…formation of carbonaceous deposits of higher hydrocarbons and carbon itself) [1][2][3][4][5] leads to the deactivation of catalysts used in different petrochemical processes. The removal of these substances by "coke buming" is a reaction, which has to be executed very carefully to prevent hot spots (areas with higher temperatures) that may lead to a sintering processes [6][7][8] in the catalyst, causing permanent deactivation.…”

Section: Introductionmentioning

confidence: 99%

Investigations about coke burning and oxygen spillover

Baumgarten¹,

Schuck²

1997

React Kinet Catal Lett

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The Kinetics of the Cracking of Cumene by Silica-Alumina Catalysts

Cited by 49 publications

References 9 publications

The catalytic cracking of arènes on SiO₂–AlPO₄ catalysts. A study of the mechanism

The catalytic cracking of arènes on SiO₂–AlPO₄ catalysts. A study of the mechanism

Analysis of zeolite catalyst deactivation during catalytic cracking reactions

Investigations about coke burning and oxygen spillover

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The Kinetics of the Cracking of Cumene by Silica-Alumina Catalysts

Cited by 49 publications

References 9 publications

The catalytic cracking of arènes on SiO2–AlPO4 catalysts. A study of the mechanism

The catalytic cracking of arènes on SiO2–AlPO4 catalysts. A study of the mechanism

Analysis of zeolite catalyst deactivation during catalytic cracking reactions

Investigations about coke burning and oxygen spillover

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The catalytic cracking of arènes on SiO₂–AlPO₄ catalysts. A study of the mechanism

The catalytic cracking of arènes on SiO₂–AlPO₄ catalysts. A study of the mechanism