Abstract
Three series of oxidic Co-Mo/γ-Al2O3 catalysts with different cobalt content and prepared by three different methods have been studied by X-ray diffraction, diffuse reflectance spectroscopy and magnetic techniques. The results show that the formation of Co and Mo surface species is affected by the method of catalyst preparation and that Mo enhances the dispersion of the cobalt species. The presence of Co3 O4 was clearly detected in cobalt-rich samples prepared by a two-step method, especially when Mo was incorporated by equilibrium adsorption. It also seems that in catalysts prepared by “wet” consecutive impregnation Co favours the formation of a Mo multilayer on the surface of Al2O3. However, in catalysts prepared by simultaneous impregnation the segregation of Co3O4 and the formation of a Mo multilayer occurs less extensively.
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References
S. C. Schuman and H. Shalit, Catal. Rev. 4 (1970) 245.
B. C. Gates, J. R. Katzer and G. C. A. Schuit, “Chemistry of Catalytic Processes”, (McGraw-Hill, New York, 1970) pp. 390–447.
F. E. Massoth, Adv. Catal. 27 (1978) 265.
M. Lo Jacono, M. Schiavello, V. H. J. De Beer and G. Minelli, J. Phys. Chem. 81 (1977) 1583.
A. Iannibello and P. C. H. Mitchell, in “Preparation of Catalysts II”, edited by B. Delmon, P. Grange, P. A. Jacobs and G. Poncelet, (Eisevier, Amsterdam, 1979) p. 469.
C. P. Cheng and G. L. Schrader, J. Catal. 60 (1979) 276.
R. I. Declerck-Grimée, P. Canesson, R. M. Friedman and J. J. Fripiat, J. Phys. Chem. 82 (1978) 889.
K. S. Chung and F. E. Massoth, J. Catal. 64 (1980) 320.
M. Lo Jacono, A. Cimino and G. C. A. Schuit, Gazz. Chim. Ital. 103 (1973) 1281.
J. H. Ashley and P. C. H. Mitchell, J. Chem. Soc. (A) (1968) 2821.
Idem, ibid. (1969) 2730.
M. Giordano, J. C. H. Bart, A. Vaghi, A. Castellan and G. Martinotti, J. Catal. 36 (1975) 81.
H. Praliaud, J. Less-Common Met. 54 (1977) 387.
H. Jeziorowski and H. Knözinger, J. Phys. Chem. 83 (1979) 1166.
F. J. Gil, J. L. García Fierro and A. López Agudo, Z. Phys. Chem. Neue Folge 123 (1980) 115.
J. Medema, C. Van Stam, V. H. J. De Beer, A. J. A. Koning and D. C. Koningsberger, J. Catal. 53 (1978) 386.
A. López Agudo, F. J. Gil Llambías, J. M. Calleja and V. Fernández, J. Raman Spectrosc. 11 (1981) 454.
G. N. Asmolov and O. V. Krylov, Kinet. Katal. 12 (1971) 463.
E. I. El'bert and B. G. Tryasunov, ibid. 16 (1975) 552.
P. Gajardo, P. Grange and B. Delmon, J. Catal. 63 (1980) 201.
A. López Agudo, F. J. Gil, P. Reyes and J. L. García Fierro, Appl. Catal. 1 (1981) 59.
F. J. Gil Llambías, PhD thesis, Complutense University of Madrid, 1980.
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Gil Llambias, F.J., López Agudo, A. & Rives-Arnau, V. Characterization of oxide Co-Mo/γ-Al2O3 hydrodesulphurization catalysts prepared by different methods. J Mater Sci 17, 936–946 (1982). https://doi.org/10.1007/BF00543511
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DOI: https://doi.org/10.1007/BF00543511