Peculiarity of Rh bulk diffusion in La-doped alumina and its impact on CO oxidation over Rh/Al2O3

Vladimir O. Stoyanovskii, Aleksey A. Vedyagin, Alexander M. Volodin, Roman M. Kenzhin, Yury V. Shubin, Pavel E. Plyusnin, Ilya V. Mishakov

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The catalytic behavior and stability of rhodium supported on pure and La-doped alumina were studied towards the CO oxidation reaction. Diffusion of Rh3 + ions into the bulk of support was shown to cause rapid deactivation in both cases. Alumina doping with La leads to modification of the alumina donor sites, concentrating of Rh near such sites, and acceleration of Rh3 + diffusion process. Diffused Rh ions were shown by means of photoluminescence to localize in the nearest coordination environment of the La ions in La-enriched alumina starting from a calcination temperature of 800 °C.

Original languageEnglish
Pages (from-to)18-22
Number of pages5
JournalCatalysis Communications
Volume97
DOIs
Publication statusPublished - 5 Jul 2017

Keywords

  • CO oxidation
  • La-promoted alumina
  • Photoluminescence
  • Prompt thermal aging
  • Rhodium diffusion
  • Stability

ASJC Scopus subject areas

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

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