UV-VIS and IR spectroscopic investigations on the generation of alkenyl carbocations from propene in zeolites of different acidity

H. Förster, I. Kiricsi, J. Seebode

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Abstract

Generation and reaction of alkenyl carbocations from propene in mordenites and HNaY zeolites of different acidity have been investigated by means of UV-VIS and IR spectroscopy. The rate of carbenium ion formation runs parallel with the number of acid sites. The bands observed upon adsorption of propene at 1535 and 1505 cm-1 can be attributed to the C-C-C stretching vibration of the allyl system of these carbocations. The shift of the UV-VIS absorptions with increasing Brönsted acidity is characteristic of the higher degree of substitution of the same type of carbocations; the alkenyl ions, due to their strong bond to the surface, can be one of the components of the carbonaceous deposits formed by reactions of olefins at low temperature.

Original languageEnglish
Pages (from-to)435-442
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume37
Issue numberC
DOIs
Publication statusPublished - 1988

Fingerprint

Zeolites
Acidity
acidity
zeolites
Propylene
Ions
Alkenes
Ultraviolet spectroscopy
alkenes
Olefins
Stretching
Infrared spectroscopy
ions
Substitution reactions
Deposits
deposits
substitutes
Adsorption
vibration
acids

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Catalysis
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

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abstract = "Generation and reaction of alkenyl carbocations from propene in mordenites and HNaY zeolites of different acidity have been investigated by means of UV-VIS and IR spectroscopy. The rate of carbenium ion formation runs parallel with the number of acid sites. The bands observed upon adsorption of propene at 1535 and 1505 cm-1 can be attributed to the C-C-C stretching vibration of the allyl system of these carbocations. The shift of the UV-VIS absorptions with increasing Br{\"o}nsted acidity is characteristic of the higher degree of substitution of the same type of carbocations; the alkenyl ions, due to their strong bond to the surface, can be one of the components of the carbonaceous deposits formed by reactions of olefins at low temperature.",
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T1 - UV-VIS and IR spectroscopic investigations on the generation of alkenyl carbocations from propene in zeolites of different acidity

AU - Förster, H.

AU - Kiricsi, I.

AU - Seebode, J.

PY - 1988

Y1 - 1988

N2 - Generation and reaction of alkenyl carbocations from propene in mordenites and HNaY zeolites of different acidity have been investigated by means of UV-VIS and IR spectroscopy. The rate of carbenium ion formation runs parallel with the number of acid sites. The bands observed upon adsorption of propene at 1535 and 1505 cm-1 can be attributed to the C-C-C stretching vibration of the allyl system of these carbocations. The shift of the UV-VIS absorptions with increasing Brönsted acidity is characteristic of the higher degree of substitution of the same type of carbocations; the alkenyl ions, due to their strong bond to the surface, can be one of the components of the carbonaceous deposits formed by reactions of olefins at low temperature.

AB - Generation and reaction of alkenyl carbocations from propene in mordenites and HNaY zeolites of different acidity have been investigated by means of UV-VIS and IR spectroscopy. The rate of carbenium ion formation runs parallel with the number of acid sites. The bands observed upon adsorption of propene at 1535 and 1505 cm-1 can be attributed to the C-C-C stretching vibration of the allyl system of these carbocations. The shift of the UV-VIS absorptions with increasing Brönsted acidity is characteristic of the higher degree of substitution of the same type of carbocations; the alkenyl ions, due to their strong bond to the surface, can be one of the components of the carbonaceous deposits formed by reactions of olefins at low temperature.

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