Abstract
The local environment of the Ni atoms in the Ni-Mo-S phase has been elucidated by Ni K-edge EXAFS and XANES measurements of carbon-supported sulfided Ni-Mo catalysts. The results show that the Ni atoms have a low sulfur coordination number (less than six). This is contrary to recent reports in which an octahedral-like sulfur coordination have been suggested. It is proposed that the Ni atoms in Ni-Mo-S are located at the\((10\bar 10)\) edges of the MoS2 structure in square and tetragonal pyramidal type sites. These two types of sites can easily interconvert during sulfur addition/extraction and may as such be involved in the catalytic cycle.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
H. Topsøe, B.S. Clausen, N.-Y. Topsøe and E. Pedersen, I&EC Fundamentals 25 (1986) 25.
B.S. Clausen, H. Topsøe, R. Candia, J. Villadsen, B. Lengeler, J. Als-Nielsen and F. Christensen, J. Phys. Chem. 85 (1981) 3868.
N.-Y. Topsøe and H. Topsøe, J. Catal. 84 (1983) 386.
O. Sørensen, B.S. Clausen, R. Candia and H. Topsøe, Appl. Catal. 13 (1985) 363.
N.-Y. Topsøe, J. Catal. 64 (1980) 235.
J. Grimblot, P. Dufresne, L. Gengembre and J.P. Bonelle, Bull. Soc. Chim. Belg. 90 (1981) 1261.
A.L. Farragher and P. Cossee,Proc. 5th Int. Congress on Catalysis (North-Holland, Amsterdam, 1973) p. 1301.
B.S. Clausen, B. Lengeler, R. Candia, J. Als-Nielsen and H. Topsøe, Bull. Soc. Chim. Belg. 90 (1981) 1249.
H. Topsøe, B.S. Clausen, N.-Y. Topsøe, E. Pedersen, W. Niemann, A. Müller, H. Bögge and B. Lengeler, J. Chem. Soc., Faraday Trans 1, 83 (1987) 2157.
B.S. Clausen, H. Topsøe, R. Candia and B. Lengeler, in:Catalytic Materials: Relationship between Structure and Reactivity, ACS Symposium Series, No. 248, San Francisco, California, 1984, p. 71.
S.M.A.M. Bouwens, Thesis, Eindhoven Technical University, Holland, 1988.
S.M.A.M. Bouwens, D.C. Koningsberger, V.H.J. de Beer and R. Prins, Cat. Lett. 1 (1988) 55.
S.M.A.M. Bouwens, D.C. Koningsberger, V.H.J. de Beer and R. Prins, Eleventh North American Meeting of the Catalysis Society, May 7–11, 1989, Dearborn, Michigan, abstract C14.
M.J. Ledoux, O. Michaux, G. Agostini and P. Panissod, J. Catal. 96 (1985) 189.
M.J. Ledoux, G. Maire, S. Hantzer and O. Michaux, in:Proc. 9th Int. Congress on Catalysis, Calgary, 1988, eds. M.J. Phillips and M. Ternan, Vol. 1, p. 74.
B.S. Clausen, W. Niemann, P. Zeuthen and H. Topsøe, in: Preprint of the Division of Petroleum Chemistry, Inc., ACS, Symposium on the Chemistry of W/Mo catalysts, Boston Meeting, April 22–27, 1990.
H. Topsøe, B.S. Clausen, N. Burriesci, R. Candia and S. Mørup, in:Preparation of Catalysts II, eds. B. Delmon, P. Grange, P. Jacobs and G. Poncelet (Elsevier, Amsterdam, 1979) p. 479.
M. Köckerling, Diploma Thesis, Munster University, FRG, 1989.
H.-F. Nolting, W. Tremel, P. Eggers, G. Henkel and B. Krebs, Nucl. Instr. and Meth. in Phys. Res. A259 (1987) 576.
W. Niemann, W. Malzfeldt, P. Rabe, R. Haensel and M. Lübcke, Phys. Rev. B 35 (1987) 1099.
M.P. van Dijk, J.A.R. van Veen, S.M.A.M. Bouwens, F.B.M. van Zon and D.C. Koningsberger, Il Nuovo Cimento (in press).
R.A. Scott, Physica B 158 (1989) 84.
J. Petiau and G. Calas, in:EXAFS and Near Edge Structure, eds. A. Bianconi, L. Incoccia and S. Stipcich (Springer, Berlin, 1983) p. 144.
N. Elliot, J. Chem. Phys. 33 (1960) 903.
M. Franzini, Z. Krist. 118 (1963) 393.
A. Müller, W. Hellmann, U. Schimanski and R. Jostes, Z. Naturforsch. 38b (1983) 528.
H. Topsøe, B.S. Clausen, N.-Y- Topsøe and P. Zeuthen, in:Studies in Surface Science and Catalysis (Elsevier) in press.
H. Topsøe and B.S. Clausen, Catal. Rev.-Sci. Eng. 26 (1984) 395.
H. Topsøe, R. Candia, N.-Y. Topsøe and B.S. Clausen, Bull. Soc. Chim. Belg. 93 (1984) 783.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Niemann, W., Clausen, B.S. & Topsøe, H. X-Ray absorption studies of the Ni environment in Ni-Mo-S. Catal Lett 4, 355–363 (1990). https://doi.org/10.1007/BF00765321
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00765321