The role of chemisorbed water in formation and stabilization of active sites on Pd/Alumina oxidation catalysts

Aleksey A. Vedyagin, Alexander M. Volodin, Roman M. Kenzhin, Vladimir O. Stoyanovskii, Vladimir A. Rogov, Vladimir V. Kriventsov, Ilya V. Mishakov

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

A series of Pd/Al2O3 catalysts with different palladium loading was prepared by incipient wetness impregnation method. As it was shown by various physicochemical methods, palladium at concentrations not exceeding 0.5 wt.% favors to stabilize in an atomic dispersed ionic state. Appearance of PdO phase has been firmly detected by TPR, DR UV–vis and EXAFS starting from Pd concentration of 1 wt.%. It was found that low-content Pd/Al2O3 catalysts are characterized by high activity in CO oxidation due to atomically dispersed palladium species tailored to the donor sites of the support. The presence of chemisorbed water allows one to stabilize Pd in highly disperse state thus preventing the catalyst deactivation.

Original languageEnglish
Pages (from-to)102-110
Number of pages9
JournalCatalysis Today
Volume307
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Alumina
  • Chemisorbed water
  • CO oxidation
  • Palladium catalysts
  • Stability
  • HYDROXYL-GROUPS
  • ELECTRON-DONOR
  • 3-WAY CATALYSTS
  • SUPPORTED PALLADIUM
  • GAMMA-ALUMINA
  • CO OXIDATION
  • VENTILATION AIR METHANE
  • CARBON-MONOXIDE OXIDATION
  • PD/AL2O3 CATALYSTS
  • PALLADIUM-ALUMINA CATALYSTS

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