Three-way catalysis with bimetallic supported Pd-Au catalysts: Gold as a poison and as a promotor

Viktor Ulrich, Boris Moroz, Pavel Pyrjaev, Ilya Sinev, Andrey Bukhtiyarov, Evgeny Gerasimov, Valerii Bukhtiyarov, Beatriz Roldan Cuenya, Wolfgang Grünert

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Three-way catalysts containing Au and/or Pd supported on either CeZrOx (CZ) or La2O3/Al2O3 (LA) were studied with respect to their performance in a model feed and characterized by various techniques (physisorption, CO chemisorption, TEM, XRD, XPS, XANES). A drastic support influence was found in both catalytic behavior and Pd-Au relation. While Au was a strong poison for all catalytic functions of Pd (oxidation, NO reduction) on LA, poisoning was much mitigated on CZ, rendering all Pd containing catalysts superior to a commercial reference. After ageing, the poisoning by Au was aggravated on LA. On CZ, Pd-rich bimetallic combinations retained better activity than Pd/CZ, which still outperformed the reference. As Au did not significantly contribute to propene oxidation and NO reduction, activity of Pd was markedly increased under a promoting influence of Au. Stabilization of PdII by ceria and delayed Pd-Au alloy formation are key features in the CZ-supported PdAu catalysts.

Original languageEnglish
Article number119614
Number of pages14
JournalApplied Catalysis B: Environmental
Volume282
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Ageing
  • Alloying
  • Support influence
  • XANES
  • XRD
  • THERMAL-STABILITY
  • PALLADIUM
  • OXIDE
  • DECOMPOSITION
  • CO OXIDATION
  • NANOPARTICLES
  • TEMPERATURE
  • SURFACE
  • SOLVENT-FREE OXIDATION
  • HYDROGEN-PEROXIDE

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