Low-temperature synthesis and properties of cobalt sulfide (Co9S8), nickel sulfide (Ni3S2), and iron sulfide (Fe7S8)

Hydrothermal fabrication and characterization of polycrystalline linneite (Co3S4) nanotubes based on the Kirkendall effect

“…Cobalt usually forms a variety of binary sulfides with the general formula of CoS x such as Co 9 S 8 , CoS, Co 3 S 4 , Co 1−x S, Co 2 S 3 and CoS 2 , which have attracted great attention in virtue of their excellent properties and potential application for hydrodesulfurization and hydrodearomatization in many industrial fields [6]. Among these cobalt sulfides, Co 3 S 4 (linneite) has a normal spinel structure (space group Fd3m), in which Co atoms occupy both the tetrahedral (A) and the octahedral (B) sites.…”

D-tracer study of butadiene hydrogenation and tetrahydrothiophen hydrodesulphurisation catalysed by Co9S8

“…In the case of molybdenum sulphide catalysis, we obtained useful information by use of bulk material [18,19], and correspondingly in this investigation of Co 9 S 8 the catalyst has been in the form of an unsupported powder. Many novel techniques for the preparation of bulk Co 9 S 8 have recently been described [12,[20][21][22][23][24]; however, the traditional route involving the sulphidation of Co 3 O 4 was used in this investigation.…”

Preparation and characterization of Co9S8 nanocrystalline and nanorods

“…As reported earlier, bulk Co 9 S 8 was prepared with anhydrous cobalt sulfate salt in a flowing gas of hydrogen sulfide and hydrogen at 525°C (Pasquariello et al 1984) and the transformation between Co 9 S 8 and CoS in a H 2 S atmosphere was above 600°C (Kiuchi and Nakamure 1983), the monosulfide form could be transformed into more sulfur richer forms after reacting with sulfur fume at temperatures of 300-400°C (Chung and Chung 2004); cubic phase nanocrystalline Co 9 S 8 could be synthesized via a facile hydrothermal synthetic route in a sealed autoclave at 160°C for 24 h (Zhang et al 2004). However, a mixed phase of Co 9 S 8 , CoS 2 and Co 3 S 4 was obtained at 150°C in our experiment.…”

“…So far, various sulfur source agents have been employed for the preparation of Co 9 S 8 , such as sulfur element (Schneemeyer and Sienko 1980), hydrogen sulfide (Pasquariello et al 1984), sodium sulfite (Zhang et al 2004), thiourea (Liu 2005) and sodium sulfide (Yu et al 2002). However, it usually needs a relatively high temperature to synthesize cobalt sulfides by using the reported sulfur source agents.…”

“…However, it usually needs a relatively high temperature to synthesize cobalt sulfides by using the reported sulfur source agents. For example, Co 9 S 8 was prepared with anhydrous cobalt sulfate salt in a flowing gas of hydrogen sulfide and hydrogen at 525°C (Pasquariello et al 1984).…”