Abstract
Highly crystalline, monophasic LaFeO3 and LaCoO3 perovskites, prepared by the explosion method, are shown to be heterogeneous at surface level. The outmost atomic layers of these perovskites contain high concentrations of carbonate-type species. Their specific activities for methane combustion are in fact identical to La2O2CO3 and air-exposed La2O3. These results compared with pertinent data from the literature hint that surface heterogeneity may be often present in mixed oxides catalysts.
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References
H. Arai and M. Machida, Catal. Today 10 (1991) 81.
H. Arai, K. Eguchi and M. Machida, in:Fukuoka International Symposium (1990) p. 227.
M.F.M. Zwinkels, S.G. Järås and P.G. Menon, Catal. Rev. Sci. Eng. 35 (1993) 319.
H. Arai, T. Yamada, K. Eguchi and T. Seiyama, Appl. Catal. 26 (1986) 265.
A. Baiker, P.E. Marti, P. Keusch, E. Fritsch and A. Reller, J. Catal. 146 (1994) 268.
N. Yamazoe and Y. Teraoka, Catal. Today 8 (1990) 175.
J.M.D. Tascón, S. Mendioroz and L.G. Tejuca, Z. Phys. Chem. 124 (1981) 109.
J.L.G. Fierro and L.G. Tejuca, J. Catal. 87 (1984) 126.
E.A. Lombardo, K. Tanaka and I. Toyoshima, J. Catal. 80 (1983) 340.
T. Le Van, M. Che, J.M. Tatibouët and M. Kermarec, J. Catal. 142 (1993) 18.
R.P. Taylor and G.L. Schrader, Ind. Eng. Chem. Res. 30 (1991) 1016.
V.G. Milt, R. Spretz, M.A. Ulla and E.A. Lombardo, J. Mater. Sci. Lett. 14 (1995) 428.
M.L. Hair,Infrared Spectroscopy in Surface Chemistry (Dekker, New York, 1967) ch. 5.
Z. Zhong, L. Chen, Q. Yan, X. Fu and J. Hong, in:Preprints 6th Int. Symp. Scientific Bases for the Preparation of Heterogeneous Catalysts, Vol. 2, Louvain-la-Neuve, 5–8 September 1994, ed. B. Delmon, p.241.
N. Gunasekaran, S. Rajadurai, J.J. Carberry, N. Bakshi and C.B. Alcock, Solid State Ionics 73 (1994) 289.
J.G. McCarty and H. Wise, Catal. Today 8 (1990) 231.
R.P. Turcotte, J.O. Sawyer and L. Eyring, Inorg. Chem. 8 (1969) 238.
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Milt, V.G., Spretz, R., Ulla, M.A. et al. The nature of active sites for the oxidation of methane on La-based perovskites. Catal Lett 42, 57–63 (1996). https://doi.org/10.1007/BF00814467
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DOI: https://doi.org/10.1007/BF00814467