Abstract
TPR/TPD and FTIR are used to characterize “excessively ion-exchanged” Cu/Na-ZSM-5. After calcination in O2 at 773 K at least two copper-oxygen species are present in addition to Cu2+ ions; these have been identified as CuO and [Cu-O-Cu]2+. Reduction in H2 transforms all these into Cu0 below 773 K. [Cu-O-Cu]2+ is autoreduced to Cu+ during outgassing. Reoxidation of Cu0 by zeolite protons to Cu+ is observed above 723 K in He or Ar; in the presence of CO this process is considerably enhanced and observed at much lower temperature, because CO is strongly adsorbed on Cu+. At 293 K CO adsorption causes reversible changes in the FTIR spectra.
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References
M. Iwamoto, in:Future Opportunities in Catalytic and Separation Technology, Studies in Surface Science and Catalysis, Vol. 54, eds. M. Misono, Y. Moro-oka and S. Kimura (Elsevier, Amsterdam, 1990) ch.II.3, p. 121.
M. Iwamoto, H. Yahiro, K. Tanda, N. Mizuno and Y. Mine, J. Phys. Chem. 95 (1991) 3727.
A.V. Kucherov, A.A. Slinkin, D.A. Kondrat'ev, T.N. Bondarenko, A.M. Rubinstein and Kh.M. Minachev, Kinet. Catal. 26 (1985) 353; Zeolites 5 (1985) 320.
C.M. Naccache and Y.B. Taarit, J. Catal. 22 (1971) 171.
P.A. Jacobs, W. Wilde, R.A. Schoonheydt, J.B. Uytterhoeven and H. Beyer, J. Chem. Soc. Faraday Trans. I 72 (1976) 1221.
C.C. Chao and J.H. Lunsford, J. Chem. Phys. 57 (1972) 2890.
J.C. Conesa and J. Soria, J. Chem. Soc. Faraday Trans. I 75 (1979) 406.
M. Iwamoto, M. Nakamura, H. Nagano and S. Kagawa, J. Phys. Chem. 86 (1982) 153.
F.R. Benn, J. Dwyer, A. Esfahani, N.P. Evmerides and A.K. Szczepura, J. Catal. 48 (1977) 60.
F. Mahoney, R. Rudham and J.V. Summers, J. Chem. Soc. Faraday Trans. I 75 (1979) 314.
A.A. Davydov, N.A. Rubene and A.A. Budneva, Kinet. Catal. 19 (1978) 776.
M. Amara, M. Bettahar, L. Gengembre and D. Olivier, Appl. Catal. 35 (1987) 153.
T.T. Wong, A.Yu. Stakheev and W.M.H. Sachtler, J. Phys. Chem., to be published.
S.T. Homeyer and W.M.H. Sachtler, J. Catal. 117 (1989) 91.
L.M. Kustov, D. Ostgard and W.M.H. Sachtler, Catal. Lett. 9 (1991) 121, and references therein.
R.A. Schoonheydt, L.J. Vandamme, P.A. Jacobs and J.B. Uytterhoeven, J. Catal. 43 (1976) 292.
M. Iwamoto, K. Maruyama, N. Yamazoe and T. Selyama, J. Phys. Chem. 81 (1977) 622.
P.A. Jacobs and H.K. Beyer, J. Phys. Chem. 83 (1979) 1174.
C. Li, K. Domen, K.-I. Maruya and T. Onishi, J. Am. Chem. Soc. 111 (1989) 7683.
K.-P. Wendlandt, F. Vogt, W. Mörke and I. Achkar,Zeolite Chemistry and Catalysis, eds. P.A. Jacobs, N.I. Jaeger, L. Kubelková and B. Wichterlová (Elsevier, Amsterdam, 1991) p. 223.
P.A. Jacobs and R. von Ballmoos, J. Phys. Chem. 86 (1982) 3050.
J. Datka and E. Tuznik, Zeolites 5 (1985) 230.
G.L. Woolery, L.B. Alemany, R.M. Dessau and A.W. Chester, Zeolites 6 (1986) 14.
V.L. Zholobenko, L.M. Kustov, V.Yu. Borovkov and V.B. Kazansky, Zeolites 8 (1988) 175.
T. Romotowski, J. Komorek, Ye.A. Paukshtis and E.N. Yurchenko, Zeolites 11 (1991) 497.
Y.Y. Huang, J. Catal. 30 (1973) 187; J. Am. Chem. Soc. 95 (1973) 6636.
E. Loeffer, U. Lohse, Ch. Peuker, G. Oehlmann, L.M. Kustov, V.L. Zholobenko and V.B. Kazansky, Zeolites 10 (1990) 266.
F. Vogt, I. Achkar, K.-P. Wendlandt, H. Hobert and M. Meier, Z. Chem. (Leipzig) 30 (1990) 112.
A.A. Davydov, Kinet. Catal. 26 (1985) 135.
G. Busca, J. Mol. Catal. 43 (1987) 225.
A.A. Davydov and A.A. Budneva, React. Kinet. Catal. Lett. 25 (1984) 121.
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On leave from: Center for Catalysis, Surface and Material Science, Department of Organic Chemistry, József Attila University, Dóm tér 8, Szeged, H-6720 Hungary.
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Sárkány, J., d'Itri, J.L. & Sachtler, W.M.H. Redox chemistry in excessively ion-exchanged Cu/Na-ZSM-5. Catal Lett 16, 241–249 (1992). https://doi.org/10.1007/BF00764336
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DOI: https://doi.org/10.1007/BF00764336