New Low-Temperature Preparations of Some Simple and Mixed Co and Ni Dispersed Sulfides and Their Chemical Behavior in Reducing Atmosphere

A series of simple (CoS2, Co9S8, NiS2, NiS, Ni3S2) and mixed sulfides (NiCo2S4, Ni0.33Co0.67S2, Ni3Co6S8, CuCo2S4, Cu0.33Co0.67S2) was prepared using low-temperature procedures. To obtain the mixed sulfides, the mixtures of the solutions of the corresponding salts were precipitated by Na2S and then...

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Bibliographic Details
Published in:Inorganic chemistry 2003-03, Vol.42 (5), p.1764-1768
Main Authors: Bezverkhyy, I, Danot, M, Afanasiev, P
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
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Summary:A series of simple (CoS2, Co9S8, NiS2, NiS, Ni3S2) and mixed sulfides (NiCo2S4, Ni0.33Co0.67S2, Ni3Co6S8, CuCo2S4, Cu0.33Co0.67S2) was prepared using low-temperature procedures. To obtain the mixed sulfides, the mixtures of the solutions of the corresponding salts were precipitated by Na2S and then heated in a sulfiding atmosphere at 300 °C. It has been found that the product phase composition depends on the sulfiding atmosphere. Using a H2S/Ar mixture leads to pyrite type sulfides, whereas treatment in H2S/H2 flow allowed the preparation of Ni−Co and Cu−Co thiospinels. The as prepared highly dispersed single-phase materials were characterized by X-ray powder diffraction, scanning electron microscopy, temperature-programmed reduction (TPR), elemental analysis, and BET surface area measurements.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic026024j