Coke Formation on Silica-Alumina Cracking Catalysts

Eberly, P. E.; Kimberlin, C. N.; Miller, William K.; Drushel, Harry V.

doi:10.1021/i260018a016

Cited by 114 publications

(37 citation statements)

References 4 publications

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“…6 1 .oc Table 4 and Table 5. On most catalysts used in hydrocarbon reactions where coking is observed, olefins have been associated with coke formation (Viner and Wojciechowski, 1982;Eberly et al, 1966). On most catalysts used in hydrocarbon reactions where coking is observed, olefins have been associated with coke formation (Viner and Wojciechowski, 1982;Eberly et al, 1966).…”

Section: Discussionmentioning

confidence: 99%

Liquid phase decomposition of t‐butyl derivatives over solid acidic catalyst

Takahashi

Hong

Tashiro³

1985

Can J Chem Eng

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The de-r-butylation of some r-butyl-derivatives has been carried out in the liquid phase using amorphous silica alumina and HY type zeolite. The deactivation coefficients obtained in liquid phase were about 10 to 100 times as large as those in the vapor phase de-r-butylation of r-butylbenzene. The activation energies for the reaction of the phenolic derivatives were nearly the same as that for the vapor phase de-r-butylation. However, the activation energies for the di-t-butyl derivatives were almost doubled. The activity of HY type zeolite was lower than that of the silica alumina, but the shape selectivity of the former was observed in the reaction of p-t-butyl-o-phenol.On a procCdC 1 la d6-r-butylation de quelques dCrivCs r-butyliques, en phase liquide, en employant une silice-alumine amorphe et une zBolithe du type HY. Les coefficients de dksactivation obtenus en phase liquide ont 6tC a peu pres 10 a 100 fois plus grands que ceux de la db-t-butylation, en phase gazeuse du r-butyl-benzene. Les energies d'activation pour la rkaction des dBrivCs phCnoliques ont Ct6 presque les m&mes que pour la dC-t-butylation en phase gazeuse; toutefois, les Bnergies d'activation pour les dBrivCs di-r-butyliques ont presque doublC. L'activit6 de la zColithe de type HY a 6t6 plus faible que celle de la silice-alumine amorphe, mais on a observ6 une sClectivitC de forme de la premiere dans la &action du p-r-butyl-ortho-phCnol.

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Section: Discussionmentioning

confidence: 99%

Liquid phase decomposition of t‐butyl derivatives over solid acidic catalyst

Takahashi

Hong

Tashiro³

1985

Can J Chem Eng

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“…The bulk of results both theoretical and experimental, have been summarized in a recent review by Butt[l]. Eberly et al [2] conducted a study of coke formation for cumene cracking in a fixed bed of silica-alumina catalyst. They found that coke formation was a complex function of the length of the cracking cycle and space velocity.…”

Section: Introductionmentioning

confidence: 99%

Catalyst poisoning and fixed bed reactor dynamics

Weng

Eigenberger

Butt

1975

Chemical Engineering Science

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Abstract-The poisoning kinetics of thiophene on Ni-kieselguhr catalysts and the deactivation behavior of nonisothermal fixed bed reactors have been studied experimentally using benzene hydrogenation as a model exothermic reaction. The time dependent axial temperature profiles in the reactors were measured and compared with values evaluated from a dispersion model , the parameters of which have been determined in separate experimentation.Poisoning kinetics were measured in a series of differential reactor experiments at atmospheric total pressure, thiophene partial pressures of 0·037-0·19 torr, hydrogen to benzene molar ratios >8/1 and temperatures from 6O--180·C. Excellent agreement was found with a power law equation for the rate of change of activity with time , fir st order in catalyst acti vity and in thiophene concentration , with an experimental activation energy of 1080 kcal/kmole. This correlation of poisoning kinetics, however, was not able to predict the propagation of the zone of activity (hot-spot) on poi soning of an integral fixed bed reactor. Initial (steady state) temperature profiles were modeled satisfactorally , but the rate of migration of the hot spot was found experimentally to be more rapid than that predicted from the correlation of poisoning kinetics. A ·semi-empirical two site deactivation model is shown to resolve the discrepancy.

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“…Eberly et al (1966) studied the cracking of n-hexadecane on silica-alumina catalysts. The effects of cycle time and space velocity on the amount of carbon deposited were investigated.…”

Section: Jyh-ping Hsumentioning

confidence: 99%

“…Voorhies (1945), e.g., proposed a power law correlation between the amount of carbon deposited and cracking time; a diffusion control mechanism was invoked. This model has been tested for different operating conditions and feed-catalyst combinations by numerous investigators in the subsequent studies (see, e.g., Blanding, 1953;Rudershausen and Watson, 1954;Wilson and Den Herder, 1958;Eberly, et al, 1966;Noda et al, 1974;Noda et al, 1975). It has been found that Voorhies' model is essentially an empirical representation since the adjustable parameter in the model varies for different cases.…”

Section: Introductionmentioning

confidence: 99%

A Stochastic Analysis of Coke Deposition

Hsu

1987

Chemical Engineering Communications

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The phenomenon of coke deposition on catalyst surface is analyzed stochastically. In contrast to a conventional deterministic approach, derivation of the governing equations of the phenomenon is based on probability laws. The resulting representation provides the information on both the mean or macroscopic and the fluctuating characteristics about the system under consideration. The deposition of coke is assumed to be reversible, i.e., deposited coke has a certain probability of escaping the surface. The applicability of the model developed is justified through analyzing available experimental data appeared in the literature.

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Coke Formation on Silica-Alumina Cracking Catalysts

Cited by 114 publications

References 4 publications

Liquid phase decomposition of t‐butyl derivatives over solid acidic catalyst

Liquid phase decomposition of t‐butyl derivatives over solid acidic catalyst

Catalyst poisoning and fixed bed reactor dynamics

A Stochastic Analysis of Coke Deposition

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