Journal of Materials Science

, Volume 42, Issue 10, pp 3307–3314 | Cite as

Effects of morphology and cesium promotion over silver nanoparticles catalysts in the styrene epoxidation

  • Ricardo José Chimentao
  • Francesc MedinaEmail author
  • Jesús Eduardo Sueiras
  • José Luís García Fierro
  • Yolanda Cesteros
  • Pilar Salagre
Size-Dependent Effects


Silver nanowires have been obtained by polyol reduction of silver nitrate in presence of polyvinyl-pyrrolidone (PVP). The as-synthesized silver nanowires were deposited on α- Al2O3. For comparison silver catalysts were also prepared by wetness impregnation obtaining irregularly shaped silver particles. Epoxidation of styrene to styrene oxide (SO) by molecular oxygen was studied using the silver catalysts. The main products were styrene oxide (SO) and phenylacetaldehyde (Phe). The promotion effect of the Cs on the silver nanowires catalysts was investigated. The Cs loading was in the range of 0–1 wt.% (refereed to silver). Furthermore, the effect of O2:C8H8 molar ratio on the catalytic epoxidation was also investigated. Silver nanowires catalysts showed superior catalytic activity compared to those prepared by impregnation method. Besides, higher O2:C8H8 ratios improved the selectivity to SO. The catalytic activity showed a maximum performance for silver nanowires promoted with 0.25 wt.% of Cs, achieving 94.6% of conversion and total selectivity to desired oxidation products (styrene oxide and phenylacetaldehyde). Moreover, the cesium promotion also contributed to the increase in the selectivity to styrene oxide. Temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) were employed to detect the presence of different species of oxygen in the catalysts indicating that subsurface oxygen was beneficial for the epoxidation. The samples were also structurally characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-visible absorption spectra and selected area electron diffraction pattern (SAED).


Styrene Silver Nanoparticles Cesium Temperature Program Reduction Styrene Oxide 



This work was supported by the Ministerio de Ciencia y Tecnologia (Spain) under Projects REN2002-04464-CO2-01 and PETRI 95-0801.OP.


  1. 1.
    Creighton JA, Eadon DG (1991) J Chem Soc Faraday Trans 87:3881CrossRefGoogle Scholar
  2. 2.
    Cao Y, Jin R, Mirkin CA (2001) J Am Chem Soc 123:7961CrossRefGoogle Scholar
  3. 3.
    Nutzenadel C, Zutell A, Chartouni D, Shimid G, and Schalapbach L (2000) Eur Phys J D8 245Google Scholar
  4. 4.
    Kim F, Kwan S, Akana J, Yang P (2001) J Am Chem Soc 123:4360CrossRefGoogle Scholar
  5. 5.
    Goldstein AN, Echer CM, Alivisatos AP (1992) Science 256:1425CrossRefGoogle Scholar
  6. 6.
    Bohmer MR, Fokkink LGJ, Schonenberger C, Van Der Zande BMI (1997) J Phys Chem B 101:852CrossRefGoogle Scholar
  7. 7.
    Nicewarner SR, Freeman RG, Reiss BD, He L, Pena DJ, Walton ID, Cromer R, Keating CD, Natan MJ (2001) Science 294:137CrossRefGoogle Scholar
  8. 8.
    Esumi K, Matsuhisa K, Torigoe K (1995) Langmuir 11:3285CrossRefGoogle Scholar
  9. 9.
    Murphy CJ, Jana NR (2002) Adv Mater 14:80CrossRefGoogle Scholar
  10. 10.
    Sun YG, Xia YN (2002) Adv Mater 14:833CrossRefGoogle Scholar
  11. 11.
    Yu YY, Chang SS, Lee CL, Wang CRC (1997) J Phys Chem B 101:6661CrossRefGoogle Scholar
  12. 12.
    Chang SS, Shih CW, Chen CD, Lai WC, Wang CRC (1999) Langmuir 15:701CrossRefGoogle Scholar
  13. 13.
    Wang ZL, Mohamed MB, Link S, El-Sayed MA (1999) Surf Sci 440:L809CrossRefGoogle Scholar
  14. 14.
    Sun Y, Xia Y (2002) Science 298:2176CrossRefGoogle Scholar
  15. 15.
    Sun Y, Gates B, Xia Y (2002) Nano Lett 2:165CrossRefGoogle Scholar
  16. 16.
    Williams FJ, Bird DPC, Sykes ECH, Santra AK, Lambert RM (2003) J Phys Chem B 107:3824CrossRefGoogle Scholar
  17. 17.
    Campbell CT (1985) J Phys Chem 89:5789CrossRefGoogle Scholar
  18. 18.
    Sachtler WMH, Backx C, Van Santen RA (1981) Cat Rev Sci Eng 23:127CrossRefGoogle Scholar
  19. 19.
    Scofield JH (1976) J Electr Rel Phen 8:129CrossRefGoogle Scholar
  20. 20.
    XPS International fundamental XPS data tables, www. xpsdata.comGoogle Scholar
  21. 21.
    Han HJ, Koo SM (2003) J Sol-Gel Sci Tech 26:467CrossRefGoogle Scholar
  22. 22.
    Meisel D (1998) J Phys Chem B 102:8364CrossRefGoogle Scholar
  23. 23.
    Murphy CJ, Jana NR (2002) Adv Mater 14:80CrossRefGoogle Scholar
  24. 24.
    Cullity BD, Stock SR (2001) Elements of X-ray diffraction, 3rd edn. Prentice-Hall, Upper Saddle River, N.J., pp 402–404Google Scholar
  25. 25.
    Nagy AJ, Mestl G, Herein D, Weinberg G, Kiltzelmann E, Schlogl R (1999) J Catal 182:417CrossRefGoogle Scholar
  26. 26.
    Nagy AJ, Mestl G (1999) Appl Catal 188:337CrossRefGoogle Scholar
  27. 27.
    Nagy AJ, Mestl G, Schlogl R (1998) J Catal 188:58CrossRefGoogle Scholar
  28. 28.
    Herein D, Nagy A, Schubert H, Weinberg G, Kitzelmann E, Schlogl R (1996) Z Phys Chem 197:67CrossRefGoogle Scholar
  29. 29.
    Nagy AJ, Mestl G, Herein D, Weinberg G, Kiltzelmann E, Schlogl R (1999) J Catal 182:417CrossRefGoogle Scholar
  30. 30.
    Somorjai GA (1994) Introduction to surface chemistry and catalysis. Wiley, New YorkGoogle Scholar
  31. 31.
    Li WX, Stampfl CS, Scheffler M (2003) Phys Rev B 67:045408CrossRefGoogle Scholar
  32. 32.
    Bao X, Muhler M, Scedel-Niedrig T, Schlogl R (1996) Phys Rev B 54:2249CrossRefGoogle Scholar
  33. 33.
    Nagy A, Mestl G, Rule T, Weinberg G, Schogl R (1998) J Catal 179:548CrossRefGoogle Scholar
  34. 34.
    Waterhouse GIN, Bowmaker GA, Metson JB (2003) Appl Catal 214:36Google Scholar
  35. 35.
    Van Santen RA, Kuipers HPCE (1987) Adv Catal 35:265Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Ricardo José Chimentao
    • 1
  • Francesc Medina
    • 1
  • Jesús Eduardo Sueiras
    • 1
  • José Luís García Fierro
    • 2
  • Yolanda Cesteros
    • 3
  • Pilar Salagre
    • 3
  1. 1.Dept. d’Enginyeria QuímicaUniversitat Rovira i VirgiliTarragonaSpain
  2. 2.Instituto de Catalisis y PetroleoquimicaCSICCantoblanco, MadridSpain
  3. 3.Dept. de Química InorgánicaUniversitat Rovira i VirgiliTarragonaSpain

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