Catalytic and infrared spectroscopic study of NO+CO reaction over iron-containing pillared montmorillonite

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Abstract

Iron-containing montmorillonites, prepared by Al/Fe mixed-metal pillaring (PILC) and by Fe3+ ion exchange were studied in the catalytic reduction of NO by CO. The Fe, Al-PILC sample was significantly more active than the Fe-montmorillonite, having the same iron content. The surface species obtained from the adsorption of the reactants were examined using transmission IR and DRIFT spectroscopy. Results suggested that redox type catalytic cycle prevailed, wherein Fe atoms were reduced by CO and reoxidized by NO. Under comparable reaction conditions a larger number of iron site was active in the more easily reducible PILC than in the Fe-montmorillonite catalysts.

Original languageEnglish
Pages (from-to)991-998
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume142 A
Publication statusPublished - 2002

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Bentonite
Carbon Monoxide
montmorillonite
Clay minerals
Iron
Infrared radiation
iron
Infrared transmission
Ion exchange
Metals
Spectroscopy
Adsorption
catalysts
Atoms
cycles
Catalysts
adsorption
metals
spectroscopy
atoms

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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abstract = "Iron-containing montmorillonites, prepared by Al/Fe mixed-metal pillaring (PILC) and by Fe3+ ion exchange were studied in the catalytic reduction of NO by CO. The Fe, Al-PILC sample was significantly more active than the Fe-montmorillonite, having the same iron content. The surface species obtained from the adsorption of the reactants were examined using transmission IR and DRIFT spectroscopy. Results suggested that redox type catalytic cycle prevailed, wherein Fe atoms were reduced by CO and reoxidized by NO. Under comparable reaction conditions a larger number of iron site was active in the more easily reducible PILC than in the Fe-montmorillonite catalysts.",
author = "F. L{\'o}nyi and J. Valyon and I. Kiricsi",
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AU - Lónyi, F.

AU - Valyon, J.

AU - Kiricsi, I.

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N2 - Iron-containing montmorillonites, prepared by Al/Fe mixed-metal pillaring (PILC) and by Fe3+ ion exchange were studied in the catalytic reduction of NO by CO. The Fe, Al-PILC sample was significantly more active than the Fe-montmorillonite, having the same iron content. The surface species obtained from the adsorption of the reactants were examined using transmission IR and DRIFT spectroscopy. Results suggested that redox type catalytic cycle prevailed, wherein Fe atoms were reduced by CO and reoxidized by NO. Under comparable reaction conditions a larger number of iron site was active in the more easily reducible PILC than in the Fe-montmorillonite catalysts.

AB - Iron-containing montmorillonites, prepared by Al/Fe mixed-metal pillaring (PILC) and by Fe3+ ion exchange were studied in the catalytic reduction of NO by CO. The Fe, Al-PILC sample was significantly more active than the Fe-montmorillonite, having the same iron content. The surface species obtained from the adsorption of the reactants were examined using transmission IR and DRIFT spectroscopy. Results suggested that redox type catalytic cycle prevailed, wherein Fe atoms were reduced by CO and reoxidized by NO. Under comparable reaction conditions a larger number of iron site was active in the more easily reducible PILC than in the Fe-montmorillonite catalysts.

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