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Dergiler / Turkish Journal of Chemistry / 2008 / Cilt: 32 - Sayı: 5

CO Oxidation over Mono and Bi-Metallic Sequentially Impregnated Pd-Pt Catalysts

Sarp KAYA
And Deniz ÜNER
Sayfa
645–652
Yayın Tarihi
2008-05-01
DOI
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On the other hand, in the presence of excess CO the reaction rates over Pd catalysts remained constant due to the availability of the subsurface oxygen pools in PdO layers.

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Amaç & Hipotez:The CO oxidation capability of sequentially impregnated Pd-Pt/g -Al2O3 bimetallic catalysts was tested.
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Temel Bulgular & Veri:An investigation of the effect of CO partial pressure on the reaction rates over monometallic catalysts indicated that in the presence of excess CO the surface of Pt was poisoned.
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Sonuç & Katkı:On the other hand, in the presence of excess CO the reaction rates over Pd catalysts remained constant due to the availability of the subsurface oxygen pools in PdO layers.
🔬Tür:Laboratuvar & Saha Deneyi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:CO oxidation · bimetallic catalysts · palladium

Özet

The CO oxidation capability of sequentially impregnated Pd-Pt/g -Al2O3 bimetallic catalysts was tested. The CO oxidation light-off curves were hierarchically spaced between monometallic Pd and monometallic Pt, which showed the highest and lowest activity, respectively, indicating that sequential impregnation did not result in the formation of bimetallic particles, but that the catalysts remained as monometallic entities over the support surface. An investigation of the effect of CO partial pressure on the reaction rates over monometallic catalysts indicated that in the presence of excess CO the surface of Pt was poisoned. On the other hand, in the presence of excess CO the reaction rates over Pd catalysts remained constant due to the availability of the subsurface oxygen pools in PdO layers.

Abstract

The CO oxidation capability of sequentially impregnated Pd-Pt/g -Al2O3 bimetallic catalysts was tested. The CO oxidation light-off curves were hierarchically spaced between monometallic Pd and monometallic Pt, which showed the highest and lowest activity, respectively, indicating that sequential impregnation did not result in the formation of bimetallic particles, but that the catalysts remained as monometallic entities over the support surface. An investigation of the effect of CO partial pressure on the reaction rates over monometallic catalysts indicated that in the presence of excess CO the surface of Pt was poisoned. On the other hand, in the presence of excess CO the reaction rates over Pd catalysts remained constant due to the availability of the subsurface oxygen pools in PdO layers.

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Bu Makaleye Atıf Yap

KAYA, S., ÜNER, A. D. (2008). CO Oxidation over Mono and Bi-Metallic Sequentially Impregnated Pd-Pt Catalysts. Turkish Journal of Chemistry, Cilt: 32 - Sayı: 5, 645–652. https://ajindex.com/articles/184995

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Kaynakça (20)

  1. Rousset, J. L.; Cadrot, A. M.; Cadete Santos Aires, F. J.; Renouprez, A.; M´elinon, P.; Perez, A.; Pellarin, M.; Vialle, J. L.; Broyer, M. J. Chem. Phys. 1995, 102, 8574-8585.
  2. Blomsma, E.; Martens, J. A.; Jacobs, P. A.; J. Catal. 1997, 165, 241-248.
  3. Renouprez, A.; Rousset, J. L.; Cadrot, A. M.; Soldo, Y.; Stievano, L. J. Alloys and Compd. 2001, 328, 50-56.
  4. Guillon, E.; Lynch, J.; Uzio, D.; Didillon, B. Catal. Today 2001, 65, 201-208. Micheaud–Especel, C.; Bazin, D.; Gu´erin, M.; Mar´ecot P.; Barbier, J.; React. Kinet. Catal. L. 2000, 69, 209 Uner, D.; Kaya, S.; Erunal, E.; Shaltaf, R.; Ellialtioglu, S. Manuscript in preparation. Rousset, J. L.; Renouprez, A. J.; Cadrot, A. M. Phys. Rev. B 1998, 58, 2150-2156.
  5. King, T.S in Surface Segregation and Related Phenomena, Dowben, P. A.; Miller, A. eds.; CRC Press,
  6. Boca Raton, FL, 1990. van den Oetelaar, L. C. A.; Nooij, O. W.; Oerlemans, S.; van der Gon, A. W. D.; Brongersma, H. H.; Lefferts, L.; Roosenbrand, A. G.; van Veen, J. A. R. J. Phys. Chem. B 1998, 102, 3445-3455.
  7. Toolenaar, F. J. C. M.; Stoop, F.; Ponec, V. J. Catal. 1983, 82, 1-12.
  8. Park, B.; Lee, H. J. Mater. Res. 1999, 14, 281-285.
  9. Kuijers, F. J.; Tieman, B. M.; Ponec, V. Surf. Sci. 1978, 75, 657-680.
  10. Overbury, S. H.; Bertrand, P. A.; Somorjai, G. A. Chem. Rev. 1975, 75, 547-560.
  11. Harada, M.; Asakura, K.; Ueki, Y.; Toshima, N. J. Phys. Chem. 1992, 96, 9730-9738.
  12. Wu, X.; Gerstein, B. C.; King, T. S. J. Catal. 1992, 135, 68-80.
  13. Uner, D. O.; Pruski, M.; King, T. S. J. Catal. 1995, 156, 60-64.
  14. Uner, D.; Tapan, N. A.; Ozen, I.; Uner, M.App. Cat. A.: General, 2003, 251, 225-234.
  15. Monteiro, R. S.; Dieguez, L. C.; Schmal, M. Catal. Today 2001, 65, 77-89.
  16. Uner, D. O. J. Catal., 1998, 178, 382-385.
  17. Meusel, I.; Hoffmann, J.; Hartmann, J.; Heemeier, M.; B¨aumer, M.; Libuda, J.; Freund, H. J. Catal. Lett. 2001,, 5-13.
  18. Persson, K.; Jansson, K.; J¨ar˚as, S. G. J. Catal. 2007, 245, 401-414.
  19. Penner, S., Bera, P., Pedersen, S., Ngo, L. T., Harris, J. J. W.; Campbell, C. T. J. Phys. Chem. B, 2006, 110, 24584. Ciuparu, D.; Bensalem, A.; Pfefferle, L. Appl. Catal. B: Environ. 2000, 26, 241-255.
  20. Conrad, H.; Ertl, G.; Latta, E. E. Surf. Sci. 1974, 41, 435-446.