Abstract
A chemical vapour deposition (CVD) procedure has been adopted for the preparation of Pd/NaY, resulting in a high dispersion of the metal phase, characterised by a bimodal distribution of particle size. The most abundant particles (80%) are about 25 Å in size, corresponding to almost twice the dimension of the zeolitic supercages. To identify their location inside or outside the zeolite matrix, the IR spectra of adsorbed CO, obtained before and after admission of NH3, have been compared. The results obtained are in sharp contrast with those for a Pd/SiO2 system, where Pd particles of comparable size are exclusively located on the external surface of the carrier. These differences support the conclusion that Pd particles in Pd/NaY are indeed located in the zeolitic cavities.
Similar content being viewed by others
References
C. Dossi, R. Psaro, A. Bartsch, A. Fusi, L. Sordelli, R. Ugo, M. Bellatreccia, R. Zanoni and G. Vlaic, J. Catal. 145 (1994) 377; T. Beutel, H. Kn¨ozinger, H. Treviño, Z.C. Zhang, W.M.H. Sachtler, C. Dossi, R. Psaro and R. Ugo, J. Chem. Soc., Faraday Trans. 90 (1994) 1335; C. Dossi, R. Psaro, R. Ugo, Z.C. Zhang and W.M.H. Sachtler, J. Catal. 149 (1994) 92; M. Baerns, S. Termath and M. Reiche, in: Catalysts and Nanostructured Materials, ed. W.R. Moser (Academic Press, San Diego, 1996) ch. 18, p. 479.
L. Sordelli, G. Martra, R. Psaro, C. Dossi and S. Coluccia, J. Chem. Soc., Dalton Trans. (1996) 265.
C. Dossi, R. Psaro, A. Bartsch, E. Brivio, A. Galasco and P. Losi, Catal. Today 17 (1993) 527.
L.L. Sheu, H. Kn¨ozinger and W.M.H. Sachtler, J. Am. Chem. Soc. 111 (1989) 8125.
Z. Zhang, F.A.P. Cavalcanti and W.M.H. Sachtler, Catal. Lett. 12 (1992) 157.
C. Dossi, R. Psaro, R. Ugo, Z.C. Zhang and W.M.H. Sachtler, J. Catal. 149(1994) 92.
Y. Tatsumo, T. Yoshida and T. Seiotsuka, Inorg. Synth. 19 (1979) 221.
W.M. Meier, D.H. Olson, Atlas of Zeolite Structure Types (Butterworths, Cambridge, 1987) p. 62.
T. Banzetti, E. Selli, D. Moscotti and L. Forni, J. Chem. Soc., Faraday Trans. 92 (1996) 1401.
L.H. Little, Infrared Spectra of Adsorbed Species (Academic Press, London, 1966) p. 250.
J. Sauer, P. Ugliengo, E. Garrone, and V. R. Saunders, Chem. Rev. 94 (1994) 2095, and references therein.
L.H. Little, Infrared Spectra of Adsorbed Species (Academic Press, London, 1966) p. 186; G. Herzberg, Molecular Spectra and Structure.II.Infrared and Raman Spectra of Polyatomic Molecules (Van Nostrand, New York, 1947) p. 296.
K. Kunimori, T. Kawai, T. Kondow, T. Onishi and K. Tamaru, Surf. Sci. 59 (1976) 302.
K.K. Al-Shammeri and J.M. Saleh, J. Phys. Chem. 90 (1986) 2906.
J.C. Bassignana, K. Wagemann, J. K¨uppers and G. Ertl, Surf. Sci. 175 (1986) 22.
K. Vikulov, G. Martra, S. Coluccia, D. Miceli, F. Arena, A. Parmaliana and E. Paukshtis, Catal. Lett. 37 (1996) 235.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sordelli, L., Martra, G., Psaro, R. et al. Intrazeolite Pd clusters: particle location. Topics in Catalysis 8, 237–242 (1999). https://doi.org/10.1023/A:1019125530752
Issue Date:
DOI: https://doi.org/10.1023/A:1019125530752