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NO reduction by CO over Pd/Ce0.6Zr0.4O2/Al2O3 catalysts: In situ FT-IR Studies of NO and CO adsorption

DI MONTE, ROBERTA
•
KASPAR, JAN
•
FORNASIERO, Paolo
altro
GUBITOSA G.
2002
  • journal article

Periodico
INORGANICA CHIMICA ACTA
Abstract
Adsorption of CO-, NO- and CO/NO-containing mixtures was investigated by in situ IR spectroscopy under flow conditions over Pd/δ-Al 2O3 and Pd/Ce0.6Zr0.4O 2/δ-Al2O3. The attention is focused on the effects of Ce0.6Zr0.4O2 addition to Pd/Al2O3 on the catalytic properties and reaction intermediates. Linearly bonded and bridged CO species adsorbed on palladium were clearly identified on Pd/Al2O3 while CO adsorption is inhibited under reaction conditions in the presence of Ce 0.6Zr0.4O2. Addition of Ce0.6Zr 0.4O2 affects the nature of the Pd sites by stabilizing oxidized dispersed Pd species. Evidence is obtained that the presence of the Ce0.6Zr0.4O2 solid solution modifies the adsorption properties of the supported Pd species and promotes the reduction of NO below 500 K via an alternative mechanism. This presumably involves reactive oxygen species at the Pd-Ce0.6Zr0.4O2 interface generated by the redox Ce4+/Ce3+ couple.
DOI
10.1016/S0020-1693(02)00800-9
WOS
WOS:000176370500037
Archivio
http://hdl.handle.net/11368/1695740
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-1842421367
Diritti
metadata only access
Soggetti
  • ceria-zirconia mixed ...

  • NO reduction

  • IR study

Web of Science© citazioni
52
Data di acquisizione
Mar 28, 2024
Visualizzazioni
3
Data di acquisizione
Apr 19, 2024
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