Characterization of active sites of Pd/Al2O3 model catalysts with low Pd content by luminescence, EPR and ethane hydrogenolysis

Aleksey A. Vedyagin, Alexander M. Volodin, Vladimir O. Stoyanovskii, Ilya V. Mishakov, Dmitrii A. Medvedev, Alexander S. Noskov

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Spectroscopic (laser-induced luminescence (LIL) and EPR) and catalytic (ethane hydrogenolysis) techniques were used for characterization of the active sites of Pd/Al2O3 catalysts. These techniques have high sensitivity and make it possible to study the catalysts with Pd concentrations as low as 0.02-0.03wt.%. It was found by EPR using spin probes that the electron donor sites of the support are modified by the deposited palladium. It was found by LIL that the Pd deposition has a substantial effect on the state of hydroxyls on the Al2O3 surface. The obtained results indicate that at Pd concentrations 0.5wt.% or lower supported Pd does not form PdO phase. Instead, it is stabilized in the form of atomically dispersed ion clusters. The possible role of the Al2O3 donor sites in stabilization of such clusters is discussed.

Original languageEnglish
Pages (from-to)397-403
Number of pages7
JournalApplied Catalysis B: Environmental
Volume103
Issue number3-4
DOIs
Publication statusPublished - 5 Apr 2011
Externally publishedYes

Keywords

  • Active sites
  • CO oxidation
  • EPR
  • Laser induced luminescence
  • Pd catalysts

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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