Comparison of the behavior of platinum and nickel in some catalytic reactions of cyclohexane

A. Sárkány, L. Guczi, P. Tétényi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The exchange reaction between cyclohexane and deuterium gas and the reactions of dehydrogenation and hydrogenolysis in the presence of deuterium have been investigated over a wide range of temperature on platinum and nickel powder catalysts. The results are as follows: 1. i. In the temperature range 30-100 °C only deuterium exchange takes place. The activation energies are the same for both catalysts although the rate of exchange is about one order of magnitude higher on Pt than on Ni. 2. ii. Between 100 and 200 °C poisoning occurs due to extensive decomposition. This effect is characteristic of nickel and causes a decrease of two orders of magnitude in catalytic activity but leaves the activation energy unchanged. 3. iii. Above 200 °C besides exchange other reactions commence and result in the formation of n-hexane, benzene and toluene on Ni and benzene on platinum. In this temperature range the deuterium appears in equilibrium distribution not only in the products but in the parent molecule. It seems very likely that at high temperature the dissociative adsorption is not rate controlling and thus the exchange and the chemical transformation are controlled by the desorption and by the surface reaction, respectively.

Original languageEnglish
Pages (from-to)181-189
Number of pages9
JournalJournal of Catalysis
Volume39
Issue number2
DOIs
Publication statusPublished - 1975

Fingerprint

Deuterium
Cyclohexane
Platinum
Nickel
cyclohexane
deuterium
platinum
nickel
Benzene
Activation energy
benzene
activation energy
catalysts
hydrogenolysis
Temperature
Hydrogenolysis
Catalysts
poisoning
Surface reactions
Toluene

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Comparison of the behavior of platinum and nickel in some catalytic reactions of cyclohexane. / Sárkány, A.; Guczi, L.; Tétényi, P.

In: Journal of Catalysis, Vol. 39, No. 2, 1975, p. 181-189.

Research output: Contribution to journalArticle

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N2 - The exchange reaction between cyclohexane and deuterium gas and the reactions of dehydrogenation and hydrogenolysis in the presence of deuterium have been investigated over a wide range of temperature on platinum and nickel powder catalysts. The results are as follows: 1. i. In the temperature range 30-100 °C only deuterium exchange takes place. The activation energies are the same for both catalysts although the rate of exchange is about one order of magnitude higher on Pt than on Ni. 2. ii. Between 100 and 200 °C poisoning occurs due to extensive decomposition. This effect is characteristic of nickel and causes a decrease of two orders of magnitude in catalytic activity but leaves the activation energy unchanged. 3. iii. Above 200 °C besides exchange other reactions commence and result in the formation of n-hexane, benzene and toluene on Ni and benzene on platinum. In this temperature range the deuterium appears in equilibrium distribution not only in the products but in the parent molecule. It seems very likely that at high temperature the dissociative adsorption is not rate controlling and thus the exchange and the chemical transformation are controlled by the desorption and by the surface reaction, respectively.

AB - The exchange reaction between cyclohexane and deuterium gas and the reactions of dehydrogenation and hydrogenolysis in the presence of deuterium have been investigated over a wide range of temperature on platinum and nickel powder catalysts. The results are as follows: 1. i. In the temperature range 30-100 °C only deuterium exchange takes place. The activation energies are the same for both catalysts although the rate of exchange is about one order of magnitude higher on Pt than on Ni. 2. ii. Between 100 and 200 °C poisoning occurs due to extensive decomposition. This effect is characteristic of nickel and causes a decrease of two orders of magnitude in catalytic activity but leaves the activation energy unchanged. 3. iii. Above 200 °C besides exchange other reactions commence and result in the formation of n-hexane, benzene and toluene on Ni and benzene on platinum. In this temperature range the deuterium appears in equilibrium distribution not only in the products but in the parent molecule. It seems very likely that at high temperature the dissociative adsorption is not rate controlling and thus the exchange and the chemical transformation are controlled by the desorption and by the surface reaction, respectively.

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