Abstract
Adsorption of 13C18O+12C16O mixtures on the Pt(2.9%)/γ-Al2O3, (Pt(2.6%)+Cu(2.7%))/γ-Al2O3, and (Pt(2.6%)+Cu(5.1%))/γ-Al2O3 catalysts was studied by FTIR spectroscopy. On the metallic Pt surface at coverages close to saturation, CO is adsorbed both strongly and weakly to form linear species for which the vibrational frequencies of the isolated 13C18O molecules adsorbed on Pt are ∼1940 and ∼1970 cm−1, respectively. The redistribution of intensities of the high-and low-frequency absorption bands in the spectra of adsorbed 13C18O indicates that these linear forms are present on the adjacent metal sites. The weak adsorption is responsible for the fast isotope exchange between the gaseous CO and CO molecules adsorbed on metal. The Pt-Cu alloys, in which the electronic state of the surface Pt atoms characteristic of monometallic Pt remains unchanged, are formed on the surface of the reduced Pt-Cu bimetallic catalysts. The decrease in the vibrational frequencies of the isolated C=O bonds in the isolated Pt-CO complexes suggests that the CO molecules adsorbed on the Cu atoms affect the electronic properties of Pt.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
O. V. Bragin and A. L. Liberman, Prevrashcheniya uglevodorodov na metall-soderzhashchikh katalizatorakh [Hydrocarbon Conversion on Metal-Containing Catalysts], Khimiya, Moscow, 1981, 264 pp. (in Russian).
W. M. H. Sachtler and R. A. van Santen, Adv. Catal., 1977, 26, 69.
H. C. de Jongste and V. Ponec, J. Catal., 1980, 63, 389.
S. B. D. A. Hamid, D. Lambert, and E. G. Derouane, Catal. Today, 2000, 63, 237.
M. Boutahala, D. Djellouli, N. Zouaoui, and F Garin, Catal. Today, 2004, 89, 379.
D. B. Furman and A. P. Barkova, Kinet. Katal., 1995, 36, 878 [Kinet. Catal., 1995, 36, 805 (Engl. Transl.)].
E. S. Shpiro, N. I. Jaeger, and G. Schulz-Ekloff, Ber. Bunsenges. Phys. Chem., 1995, 99, 1321.
N. A. Sokolova, A. P. Barkova, D. B. Furman, V. Yu. Borovkov, and V. B. Kazanskii, Kinet. Katal., 1995, 36, 473 [Kinet. Catal., 1995, 36, 434 (Engl. Transl.)].
M. Kolodziejczyk, R. E. R. Colen, M. Berdau, B. Delmon, and J. H. Block, Surf. Sci., 1997, 375, 235.
P. C. Liao, J. J. Carberry, T. H. Fleisch, and E. E. Wolf, J. Catal., 1982, 74, 307.
L. S. Vadlamannati, D. R. Luebke, V. I. Kovalchuk, and J. L. d’Itri, Stud. Surf. Sci. Catal., 2000, 130, 233.
V. Yu. Borovkov, D. R. Luebke, V. I. Kovalchuk, and J. L. d’Itri, J. Phys. Chem. B, 2003, 107, 5568.
V. I. Kovalchuk and J. L. d’Itri, Appl. Catal. A, 2004, 271, 13.
D. R. Luebke, L. S. Vadlamannati, V. I. Kovalchuk, and J. L. d’Itri, Appl. Catal. B, 2002, 35, 211.
F. Stoop, F. J. C. M. Toolenaar, and V. Ponec, J. Chem. Soc., Chem. Commun., 1981, 1024.
F. J. S. M. Toolenaar, D. Reinalda, and V. Ponec, J. Catal., 1980, 64, 110.
F. J. C. M. Toolenaar, F. Stoop, and V. Ponec, J. Catal., 1983, 82, 1.
E. S. Shpiro, O. P. Tkachenko, N. I. Jaeger, G. Schulz-Ekloff, and W. Grunert, J. Phys. Chem. B, 1998, 102, 3798.
G. D. Mahan and A. A. Lucas, J. Chem. Phys., 1979, 68, 1344.
B. N. J. Persson and R. Ryberg, Phys. Rev. B, 1981, 24, 6954.W
B. N. J. Persson and A. Liebsch, Surf. Sci., 1981, 110, 356.
R. M. Hammaker, S. Francis, and R. P. Eischens, Spectrochim. Acta, 1965, 21, 1295.
A. Grossley and D. A. King, Surf. Sci., 1977, 68, 528.
L. S. Vadlammanti, V. I. Rjvalchuk, and J. L. d’Itri, Stud. Surface Sci. Catal., 2000, 130, 233.
K. Balacrishman and J. Schwank, J. Catal., 1992, 138, 491.
V. Ponec, Adv. Catal., 1983, 32, 149.
V. Yu. Borovkov, S. P. Kolesnikov, V. I. Kovalchuk, and J. L. d’Itri, J. Phys. Chem. B, 2005, 109, 19772.
S. S. Deshmukh, V. I. Kovalchuk, V. Yu. Borovkov, J. L. d’Itri, J. Phys. Chem. B, 2000, 104, 1277.
N. Sheppard and T. T. Nguyen, Adv. Infrared Raman Spectrocrosc., 1978, 5, 67.
D. A. King, in Vibrational Spectroscopy of Adsorbates, Eds R. F. Willis and B. K. Agarwal, Springer, Berlin, 1980, p. 179.
A. Crossley and D. A. King, Surf. Sci., 1980, 95, 131.
B. N. J. Persson, M. Tushaus, and A. M. Bradshaw, J. Chem. Phys., 1990, 92, 5034.
B. N. J. Persson and F. M. J. Hoffmann, J. Electron. Spectrosc. Rel. Phenom., 1987, 45, 215.
S. D. Jackson, B. M. Glanville, J. Willis, G. D. McLellan, J. Webb, R. B. Moyes, S. Simpson, H. Wells, P. B. Wells, and R. J. Whyman, J. Catal., 1993, 139, 207.
H. Heyne and F. C. Tompkins, Trans. Faraday Soc., 1967, 63, 1274.
F. T. Bain, S. D. Jackson, S. J. Thomson, G. Webb, and E. Willocks, J. Chem. Soc., Faraday Trans. 1, 1976, 72, 2516.
S. G. Podkolzin, J. Shen, J. J. de Pablo, and J. A. Dumesic, J. Phys. Chem. B, 2000, 104, 4169.
Y. Y. Yeo, I. Vattone, and D. A. King, J. Chem. Phys., 1996, 106, 392.
H. Froitzhaim, H. Hopster, H. Iach, and S. Lehwald, Appl. Phys., 1977, 13, 147.
C. A. Lucas, N. M. Marcovic, and P. N. Ross, Surf. Sci., 1999, 425, L381.
R. I. Masel, Principle of Adsorption and Reaction on Solid Surfaces, Wiley, New York, 1966, Ch. 3.
Y. Y. Yeo, I. Vattone, and D. A. King, J. Chem. Phys., 1996, 104, 3810.
F. M. Hoffmann, Surf. Sci., 1983, 3, 107.
J. Pitchard, N. Catterick, and R. K. Gupta, Surf. Sci., 1975, 53, 1.
Author information
Authors and Affiliations
Corresponding author
Additional information
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 831–836, May, 2007.
Rights and permissions
About this article
Cite this article
Borovkov, V.Y., Kolesnikov, S.P., Koval’chuk, V.I. et al. The state of metals in the Pt/Al2O3 and (Pt-Cu)/Al2O3 catalysts as indicated by IR spectroscopy with isotope dilution of 12C16O with 13C18O molecules. Russ Chem Bull 56, 863–869 (2007). https://doi.org/10.1007/s11172-007-0130-0
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/s11172-007-0130-0