The Amazing Benefits of Cobalt Disulfide
Publish Time: 2022-10-19 Origin: Site
Cobalt disulfide, an organic compound, chemical formula CoO2, is a black crystalline powder, insoluble in water.
On October 27, 2017, the International Agency for Research on Cancer (IARC) of the World Health Organization (WHO) released a preliminary reference for the list of carcinogens. Cobalt and cobalt compounds are in the 2B list of carcinogens.
Cobalt sulfides precipitate when aqueous solutions of cobalt(II) ions are treated with hydrogen sulfide. This reaction is useful in the purification of cobalt from its ores as well as in qualitative inorganic analysis. In general, the sulfides of cobalt are black, semiconducting, insoluble in water, and nonstoichiometric.
Physicochemical properties of cobalt disulfide
CAS: 12013-10-4
EINECS: 682-014-2
Chemical formula: CoS2
Appearance: black crystalline powder
Purity: 3N5 (99.95%) above
Molecular weight: 123.06
Density: 4.300
Melting point: decomposes at 269℃
Solubility: Insoluble in water
Storage conditions: Room temperature
Preparation of cobalt disulfide
1. The newly prepared cobalt carbonate is mixed with three times the weight of sulfur, then ignited, burned and heated to a temperature slightly lower than red heat. If the product is not black, it is mixed with sulfur and burned again to obtain CoS2.
2. Make the mixture of H2S and N2 gas (according to the volume ratio of 1∶1) pass through the heated solid surface of CoSO4, the heating temperature is 450℃, and the reaction time is 2.5h, CoS2 can be generated.
Stability of cobalt disulfide
When used and stored according to specifications, it will not decompose. Insoluble in water, not alkali and acid (except HNO3 and AQUa rega) erosion, heating to red heat will lose sulfur to form a gray sulfide.
Applications
In combination with molybdenum, the sulfides of cobalt are used as catalysts for the industrial process called hydrodesulfurization, which is implemented on a large scale in refineries. Synthetic cobalt sulfides are widely investigated as electrocatalysts.