An UV-Vis spectroscopic study on carbenium ions formed on HY-FAU zeolite upon the adsorption of various hydrocarbons

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Abstract

It was shown that adsorbed hydrogen-rich carbonaceous residues could be formed on zeolites, but, when the temperature was not too high, they were typical only for unsaturated hydrocarbons. The overlayer then mainly contained alkenyl carbenium ions of various length. They were detected on the zeolite surface by UV-Vis spectroscopy. In the formation of these ions both Brønsted and Lewis acid centres played significant role. The unsaturated carbenium ions provided additional Lewis acid sites participating in hydride ion abstraction. The formation of alkenyl carbenium ions started at temperature as low as 298 K for butadiene. When n-butane, a saturated hydrocarbon, was the model, adsorbed hydrogen-rich carbonaceous residues were not found even at adsorption temperature as high as 473 K.

Original languageEnglish
Pages (from-to)331-334
Number of pages4
JournalJournal of Molecular Structure
Volume651-653
DOIs
Publication statusPublished - Jun 1 2003

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Keywords

  • 1-Butene
  • 2,3-Butadiene
  • Alkenyl carbenium ions
  • HY-FAU zeolite
  • Isobutene
  • UV-Vis spectroscopy
  • n-Butane

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

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