Structure of cobalt sulfide phase in carbon-supported cobalt and cobalt-molybdenum sulfide catalysts

S.M.A.M. Bouwens, D.C. Koningsberger, V.H.J. Beer, de, R. Prins

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Abstract

An X-Ray absorption spectroscopy study has been carried out on a carbon-supported Co and Co-Mo sulfide catalyst, the latter consisting of a fully sulfided Co-Mo-S (type II) phase. Detailed information on the structure of the cobalt sulfide phase is obtained by comparing the EXAFS and XANES spectra of the catalysts with those of Co9S8 and CoS2 reference compounds. It is shown that the cobalt atoms in the Co-Mo-S phase have an octahedral-like sulfur coordination while the cobalt atoms in the sulfided Co/C catalyst have a larger fraction of octahedral cobalt than Co9S8. On the basis of these results, the high HDS activity of a sulfided Co/C catalyst can be understood since it appears that the structure of the cobalt sulfide phase in Co/C is in agreement with that in Co-Mo/C. In the Co-Mo-S phase, approximately one cobalt atom is in contact with one molybdenum atom at a distance of 2.85 Å.
Original languageEnglish
Title of host publicationCharacterization and catalyst development : an interactive approach
EditorsS.A. Bradley, M.J. Gattuso, R.J. Bertolacini
Place of PublicationWashington, D.C.
PublisherAmerican Chemical Society
Pages319-327
ISBN (Print)0-8412-1684-3
DOIs
Publication statusPublished - 1989
Eventconference; 196th national meeting of the American Chemical Society, Los Angeles, California, September 25 - 30, 1988; 1988-09-25; 1988-09-30 -
Duration: 25 Sep 198830 Sep 1988

Publication series

NameACS Symposium Series
Volume411
ISSN (Print)0097-6156

Conference

Conferenceconference; 196th national meeting of the American Chemical Society, Los Angeles, California, September 25 - 30, 1988; 1988-09-25; 1988-09-30
Period25/09/8830/09/88
Other196th national meeting of the American Chemical Society, Los Angeles, California, September 25 - 30, 1988

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Bouwens, S. M. A. M., Koningsberger, D. C., Beer, de, V. H. J., & Prins, R. (1989). Structure of cobalt sulfide phase in carbon-supported cobalt and cobalt-molybdenum sulfide catalysts. In S. A. Bradley, M. J. Gattuso, & R. J. Bertolacini (Eds.), Characterization and catalyst development : an interactive approach (pp. 319-327). (ACS Symposium Series; Vol. 411). Washington, D.C.: American Chemical Society. https://doi.org/10.1021/bk-1989-0411.ch029