CO-induced structural changes of supported Rh promoted by NO

E. Novák, D. Sprinceana, F. Solymosi

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The effects of NO on the CO-induced structural changes of Rh deposited on SiO2, MgO and TiO2 are investigated in the temperature range 110-503 K by means of infrared spectroscopy. It was observed that the addition of NO to CO dramatically enhanced the development of gem-dicarbonyl, RhI(CO)2, from Rhx-CO species - indicative of the occurrence of the oxidative disruption of the Rhx cluster - for all the three samples at 233-300 K. This is explained by the formation of a strong bond between NO and Rhx crystallites which weakens the Rh-Rh bond. It is assumed that the NO and its dissociation product, the adsorbed O, participate in the oxidation of isolated RhO atoms to RhI ions. On the other hand, the presence of NO slowed down the conversion of gem-dicarbonyl into Rhx-CO at and above 448 K to a great extent, indicating that NO retards the reductive agglomerization of RhI to Rhx crystallites on these supports.

Original languageEnglish
Pages (from-to)89-101
Number of pages13
JournalApplied Catalysis A: General
Volume149
Issue number1
Publication statusPublished - Jan 23 1997

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Gems
Carbon Monoxide
Crystallites
Infrared spectroscopy
Atoms
Oxidation
Ions
Temperature

Keywords

  • Gem-dicarbonyl
  • NO
  • Rhodium

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

CO-induced structural changes of supported Rh promoted by NO. / Novák, E.; Sprinceana, D.; Solymosi, F.

In: Applied Catalysis A: General, Vol. 149, No. 1, 23.01.1997, p. 89-101.

Research output: Contribution to journalArticle

Novák, E. ; Sprinceana, D. ; Solymosi, F. / CO-induced structural changes of supported Rh promoted by NO. In: Applied Catalysis A: General. 1997 ; Vol. 149, No. 1. pp. 89-101.
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