Abstract
Sulfided αand β-NiMoO4 have been employed as model HDS catalysts, aiming to investigate the effect of phase composition of the precursor mixed oxide on the physicochemical characteristics and activity of the sulfides. Both sulfides are highly amorphous or microcrystalline, and could not be differentiated by means of XRD. The differences in BET area were also found to be minimal. However, it was found by means of TPR that the stable α-isomorph is reduced at lower temperatures than the unstable β-phase in both the oxidic and sulfided states. Sulfided β-NiMoO4 was found to be a better catalyst for the HDS of thiophene than the sulfided α-isomorph. This could be related to the higher stability of the former in H2, as decomposition of the active, amorphous Ni-Mo-S structures results in less active and more crystalline phases, as found by XRD.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A.W. Sleight and B.L. Chamberlain, Inorg. Chem. 7 (1968) 1672.
C. Mazzocchia, C. Aboumrad, C. Diagne, E. Tempesti, J.M. Herrmann and G. Thomas, Catal. Lett. 10 (1991) 181.
F. DiRenzo, C. Mazzocchia, G. Thomas and A.M. Verney, React. Solids 6 (1988) 145.
L.M. Plyasova, M.M. Andrushkevich, B.A. Buyanov and I. Sh. Itenberg, Kinet. Katal. 14 (1973) 1345 (Engl. Transl. 14 (1974) 1190).
C. Mazzocchia, F. DiRenzo, C. Aboumrad and G. Thomas, Solid State Ionics 32/33 (1989) 228.
J. Laine and K.C. Pratt, Ind. Eng. Chem. Fund. 20 (1981) 1.
F.V. Melo, E. Sanz, A. Corma and A. Mifsud, in:Preparation of Catalysts IV, Stud. Surf. Sci. Catal., Vol. 31, eds. B. Delmon, P. Grange, P.A. Jacobs and G. Poncelet (Elsevier, Amsterdam, 1987) p. 557.
R.A. Madeley and S.E. Wanke, Appl. Catal. 39 (1988) 295.
J.L. Brito and J. Laine, J. Catal. 139 (1993) 540.
P. Dufresne, E. Payen, J. Grimblot and J.P. Bonnelle, J. Phys. Chem. 85 (1981) 2344.
J.L. Brito and J. Laine, Appl. Catal. 72 (1991) L13.
K.C. Pratt, J.V. Sanders and N. Tamp, J. Catal. 66 (1980) 82.
J.V. Sanders and K.C. Pratt, J. Catal. 67 (1981) 331.
J. Haber and J. Janas, in:Reaction Kinetics in Heterogeneous Chemical Systems, ed. P. Barret (Elsevier, Amsterdam, 1975) p. 737.
J. Haber, J. Less Comm. Metals 36 (1974) 277.
J.L. Brito, J. Laine and K.C. Pratt, J. Mater. Sci. 24 (1989) 425.
B. Scheffer, N.J.J. Dekker, P.J. Mangnus and J.A. Moulin, J. Catal. 121 (1990) 31.
J.B. McKinley, in:Catalysis, Vol. 5, ed. P.B. Emmet (Reinhold, New York, 1957) p. 405.
J. Laine, J. Brito, J. Gallardo and F. Severino, J. Catal. 91 (1985) 64.
JCPDS Powder Diffraction File, Int. Centre for Diffraction Data, Swarthmore, PA, (1989).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Brito, J.L., Barbosa, A.L., Albornoz, A. et al. Nickel molybdate as precursor of HDS catalysts: Effect of phase composition. Catal Lett 26, 329–337 (1994). https://doi.org/10.1007/BF00810606
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00810606