Catalytic purification of exhaust gases over Pd-Rh alloy catalysts

Aleksey A. Vedyagin, Mikhail S. Gavrilov, Alexander M. Volodin, Vladimir O. Stoyanovskii, Elena M. Slavinskaya, Ilya V. Mishakov, Yuri V. Shubin

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Three-way catalysts with low content of Pd-Rh alloy particles used as active components were synthesized and studied. Monometallic and bimetallic mixed catalysts with corresponding precious metals loading were chosen as reference samples. The catalytic activity was tested in oxidation of carbon monoxide, hydrocarbons, and in nitrogen oxides reduction. The stability of the samples was estimated by prompt thermal aging in situ technique. Ethane hydrogenolysis testing reaction was used to determine the surface concentration of Pd and Rh, and to confirm the alloy formation. Photoluminescence and electron paramagnetic resonance spectroscopy were applied to clarify the possible reasons of deactivation and to elucidate the mechanism of stabilization. It was shown that Pd-Rh alloyed catalyst is characterized by comparable activity and enhanced stability. While the Pd and Rh particles of monometallic samples were found to interact with support at high temperatures resulting in sintering and bulk diffusion, the particles of alloy type kept their initial state of dispersion and catalytic activity.

Original languageEnglish
Pages (from-to)1008-1014
Number of pages7
JournalTopics in Catalysis
Volume56
Issue number11
DOIs
Publication statusPublished - Aug 2013
Externally publishedYes

Keywords

  • Deactivation
  • Exhaust gases neutralization
  • Rhodium-palladium alloy
  • Stability
  • Three-way catalysts

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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  • Cite this

    Vedyagin, A. A., Gavrilov, M. S., Volodin, A. M., Stoyanovskii, V. O., Slavinskaya, E. M., Mishakov, I. V., & Shubin, Y. V. (2013). Catalytic purification of exhaust gases over Pd-Rh alloy catalysts. Topics in Catalysis, 56(11), 1008-1014. https://doi.org/10.1007/s11244-013-0064-8