Authors:
J. Ladrière Université Catholique de Louvain Laboratoire de Chimie Inorganique et Nucléaire chemin du Cyclotron 2 B-1348 Louvain-la-Neuve Belgium)

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S. Göbölös Université Catholique de Louvain Groupe de Physico-Chimie M érale et de Catalyse Place croix du sud 1 B-1348 Louvain-la-Neuve Belgium)

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F. Delannay Université Catholique de Louvain Groupe de Physico-Chimie M érale et de Catalyse Place croix du sud 1 B-1348 Louvain-la-Neuve Belgium)

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B. Delmon Université Catholique de Louvain Groupe de Physico-Chimie M érale et de Catalyse Place croix du sud 1 B-1348 Louvain-la-Neuve Belgium)

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Abstract  

A57Co doped unsupported CoMo sulfide catalyst with atomic composition ratio r=Co/(Co+Mo)=0.3 was prepared by the homogeneous sulfide precipitation method and exposed to a series of reduction-sulfidation treatments. The treated samples were analyzed by Mössbauer emission spectroscopy using very long accumulation times. Computer decomposition of the spectra revealed the presence of five different cobalt species which were identified as Co9S8, CoS1+x, and three species related to the Co–Mo–S structure. Reduction of the sample under atmospheric pressure of H2 at (and above) 573 K causes an increase of the amount of Co9S8 at the expense of all other species. These results afford a new insight into the stability of the Co–Mo–S structure and of the sulfur rich CoS1+x phase under hydrotreating conditions.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)