Structure of surface tantalate species and photo-oxidation of carbon monoxide over silica-supported tantalum oxide

Abstract

Tantalum oxide (10 wt.% as Ta₂O₅) supported on silica was prepared and the structure and the photo-oxidation of carbon monoxide over the catalyst sample were investigated. XAFS analysis showed that surface tantalate is a TaO₄ tetrahedral species with a Ta2O bond which is a photoactive center. The initiation of the photo-oxidation of carbon monoxide is the photoadsorption of an oxygen molecule on the catalyst sample, elucidated by photoluminescence. EPR spectroscopy showed that the photo-excited center interacts with an oxygen molecule to form a T-type ozonide ion. A carbon monoxide ion attacks the ozonide ion to form an [O₃–CO]^- paramagnetic intermediate to lead the production of carbon dioxide.

References

1. S. Kalliaguin, B. N. Shelimov and V. B. Kazansky, J. Catal., 1978, 55, 384.
2. T. Tanaka, S. Takenaka, T. Funabiki and S. Yoshida, Chem. Lett., 1994, 1585; S. Takenaka, T. Kuriyama, T. Tanaka, T. Funabiki and S. Yoshida, J. Catal., 1995, 155, 196; T. Tanaka, S. Takenaka, T. Funabiki and S. Yoshida, J. Chem. Soc., Faraday Trans., 1996, 92, 1975; S. Takenaka, T. Tanaka, T. Funabiki and S. Yoshida, Catal. Lett., 1997, 44, 67; S. Takenaka, T. Tanaka, T. Yamazaki, T. Funabiki and S. Yoshida, J. Phys. Chem. B, 1997, 101, 9035; S. Takenaka, T. Tanaka, T. Funabiki and S. Yoshida, J. Chem. Soc., Faraday Trans., 1997, 93, 4151.
3. K. Wada and Y. Watanabe, in Methane and Alkane Conversion Chemistry, ed. M. M. Bhasin and D. W. Slocum, Plenum Press, New York, 1995, p. 179; K. Wada, H. Yamada, Y. Watanabe and T. Mitsudo, J. Chem. Soc., Faraday Trans., 1998, 94, 1771.
4. S. Yoshida, T. Tanaka, M. Okada and T. Funabiki, J. Chem. Soc., Faraday Trans. 1, 1984, 80, 119; H. Kobayashi, M. Yamaguchi, T. Tanaka and S. Yoshida, J. Chem. Soc., Faraday Trans. 1, 1985, 81, 1513.
5. T. Tanaka, M. Ooe, T. Funabiki and S. Yoshida, J. Chem. Soc., Faraday Trans. 1, 1986, 82, 35; Y. Nishimura and S. Yoshida, in Computer Aided Innovation of New Materials II, ed. M. Doyama, J. Kihara, M. Tanaka and R. Yamamoto, Elsevier, Amsterdam, 1993, p. 1029.
6. S. Yoshida, Y. Nishimura, T. Tanaka and T. Funabiki, Catal. Today, 1990, 8, 67; T. Tanaka, H. Nojima, H. Yoshida, H. Nakagawa, T. Funabiki and S. Yoshida, Catal. Today, 1993, 16, 297.
7. T. Tanaka, Y. Nishimura, S. Kawasaki, M. Ooe, T. Funabiki and S. Yoshida, J. Catal., 1989, 118, 32.
8. T. Tanaka, S. Takenaka, T. Funabiki and S. Yoshida, Chem. Lett., 1994, 809.
9. S. Yoshida, Y. Matsumura, S. Noda and T. Funabiki, J. Chem. Soc., Faraday Trans. 1, 1981, 77, 2237.
10. A. M. Gritzkov, V. A. Shvets and V. B. Kazansky, Chem. Phys. Lett., 1975, 35, 511; M. Anpo, I. Tanahashi and Y. Kubokawa, J. Phys. Chem., 1980, 84, 3440.
11. D. L. Nguyen, P. C. Roberge and S. Kalliaguin, Can. J. Chem. Eng., 1979, 57, 2880; S. Kalliaguin, M. Guakoury and P. C. Roberge, Can. J. Chem. Eng., 1981, 59, 710.
12. T. Tanaka, S. Takenaka, T. Funabiki and S. Yoshida, in Acid–Base Catalysis II (Proceedings of International Symposium on Acid–Base Catalysis 2, Sapporo, 1993), ed. H. Hattori, M. Misono and Y. Ono, Kodansha, Tokyo, 1994, p. 485.
13. T. Uruga, H. Tanida, Y. Yoneda, K. Takeshita, S. Emura, M. Takahashi, M. Harada, Y. Nishihata, Y. Kubozono, T. Tanaka, T. Yamamoto, H. Maeda, O. Kamishima, Y. Takabayashi, Y. Nakata, H. Kimura, S. Goto and T. Ishikawa, J. Synchrotron Radiat., 1999, 6, 143.
14. T. Tanaka, H. Yamashita, R. Tsuchitani, T. Funabiki and S. Yoshida, J. Chem. Soc., Faraday Trans. 1, 1988, 84, 2987.
15. G. Martens, P. Rabe, N. Schwentner and A. Werner, Phys. Rev. Lett., 1977, 39, 1411.
16. J. A. Horsley, I. E. Wachs, J. M. Brown, G. H. Via and F. D. Hardcastle, J. Phys. Chem., 1987, 91, 4014.
17. S. Yoshida, T. Tanaka, T. Hanada, T. Hiraiwa, H. Kanai and T. Funabiki, Catal. Lett., 1992, 12, 277.
18. S. Yoshida, T. Tanaka, Y. Nishimura, H. Mizutani and T. Funabiki, in Catalysis, Theory to Practice (Proceedings of 9th International Congress on Catalysis, 1988), ed. M. J. Phillips and M. Ternan, Chemical Institute of Canada, Calgary, ON, 1988, vol. 3, p. 1473.
19. H. Yoshida, T. Tanaka, T. Yoshida, T. Funabiki and S. Yoshida, Catal. Today, 1996, 28, 79.
20. T. Tanaka, H. Yoshida, K. Nakatsuka, T. Funabiki and S. Yoshida, J. Chem. Soc., Faraday Trans., 1992, 88, 2297.
21. H. Yoshida, T. Tanaka, T. Funabiki and S. Yoshida, J. Chem. Soc., Faraday Trans., 1994, 90, 2107.
22. M. Ché and A. J. Tench, Adv. Catal., 1983, 32, 1.
23. A. R. Gonzalez-Elipe, C. Louis and M. Ché, J. Chem. Soc., Faraday Trans. 1, 1982, 78, 1297.
24. A. Ogata, A. Kazusaka and M. Enyo, J. Phys. Chem., 1986, 90, 5201.
25. Y. Ben Taarit, J. C. Vedrine, C. Naccache, Ph. de Montgolfier and P. Meriaudeau, J. Chem. Phys., 1970, 64, 2880.