Publication

Reversible NOx storage over Ru/Na-Y zeolite

Smeekens, S., Heylen, S., Villani, K., Houthoofd, K., Godard, E., Tromp, M., Seo, J. W., DeMarco, M., Kirschhock, C. E. A. & Martens, J. A., 2010, In : Chemical Science. 1, 6, p. 763-771 9 p.

Research output: Contribution to journalArticleAcademicpeer-review

Copy link to clipboard

Documents

  • Reversible NOxstorage over Ru/Na–Y zeolite

    Final publisher's version, 257 KB, PDF document

    Request copy

DOI

  • Sylvia Smeekens
  • Steven Heylen
  • Kenneth Villani
  • Kristof Houthoofd
  • Eric Godard
  • Moniek Tromp
  • Jin Won Seo
  • Michael DeMarco
  • Christine E. A. Kirschhock
  • Johan A. Martens

Ruthenium loaded Na-Y zeolite was found to be an efficient adsorbent for achieving NOx adsorption-desorption cycles comprising adsorption under oxidizing and desorption under reducing conditions. The speciation of ruthenium was investigated using TEM, EXAFS, Ru-99 Mossbauer spectroscopy and XRD in combination with Rietveld refinement. The sodium cation siting was monitored using Na-23 MAS NMR. Characterization of the Ru/Na-Y adsorbent in NOx saturated and regenerated state revealed a unique cooperation of supported ruthenium nano metal particles and isolated Ru atoms in framework cavities affecting the sodium cations. Supported ruthenium nanoparticles assume a catalytic role in NO oxidation. Ruthenium atoms in framework cavities undergo switching of oxidation state during adsorption-desorption cycles. It triggers reversible sodium cation migrations from coordination with the framework in the regenerated state to coordination in sodium-water networks in supercages providing adsorption sites for NOx during adsorption. The peculiar ruthenium organization is naturally obtained upon lean-rich cycling. Ru/Na-Y adsorbent is insensitive to SOx and to the presence of CO during reductive regeneration.

Original languageEnglish
Pages (from-to)763-771
Number of pages9
JournalChemical Science
Volume1
Issue number6
Publication statusPublished - 2010
Externally publishedYes

    Keywords

  • SELECTIVE CATALYTIC-REDUCTION, RUTHENIUM CATALYSTS, REACTION-MECHANISM, TRANSITION-METAL, NITROGEN-OXIDES, EXHAUST-GAS, ADSORPTION, DENO(X), STATE, CHEMISTRY

ID: 107572458