Mössbauer study of the sulfidation of hydrodesulfurization catalysts: so Called 'Co-Mo-S' phase observed in carbon-supported Co and Co-Mo Sulfide catalysts

M.W.J. Crajé, E. Gerkema, V.H.J. Beer, de, A.M. Kraan, van der

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

6 Citations (Scopus)

Abstract

In-situ Mössbauer Emission Spectroscopy (MES) has been used to study the type of phases present in sulfided activated carbon-supported Co and Co-Mo hydrodesulfurization (HDS) catalysts. Most of the reported MES studies are performed on Co-Mo/Al2O3 catalysts. Co species in the so-called "Co-Mo-S" phase, so far only observed in sulfided catalysts containing Co and Mo, should govern the HDS activity. The present observations show that the same Co species in sulfided Co/C and Co-Mo/C catalysts, with the same quadrupole splitting (QS) as "Co-Mo-S" can be formed. Similar results are obtained for sulfided Fe/C and Fe-Mo/C catalysts. Furthermore, it turns out that the QS-value of the "active phase" in the sulfided Co/C and Co-Mo/C catalysts depends on the sulfiding temperature and Co content. Hence, it seems unlikely that there will be only one well defined active sulfide phase which governs the HDS activity.
Original languageEnglish
Title of host publicationHydrotreating Catalysts - Preparation, Characterization and Performance, Proceedings of the Annual International AlChE Meeting, Washington, DC
EditorsL. Occelli, R.G. Anthony
Place of PublicationAmsterdam
PublisherElsevier
Pages165-179
ISBN (Print)0-444-88032-1
DOIs
Publication statusPublished - 1989
Event1988 AIChE Annual Meeting - Washington, United States
Duration: 27 Nov 19882 Dec 1988

Publication series

NameStudies in Surface Science and Catalysis
Volume50
ISSN (Print)0167-2991

Conference

Conference1988 AIChE Annual Meeting
CountryUnited States
CityWashington
Period27/11/882/12/88

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