How are cobalt compounds used as catalysts in chemical reactions?

Cobalt compounds serve as essential catalysts in various industrial chemical reactions, functioning primarily in two ways:

Hydroformylation (Oxo Process)

Cobalt carbonyls, such as octacarbonyldicobalt (${\text{Co}}_2(\text{CO}{)}_8$), are widely used as homogeneous catalysts in the hydroformylation process. In this reaction, carbon monoxide and hydrogen are added to alkenes to produce aldehydes that contain one additional carbon atom. The catalyst is believed to activate hydrogen by forming hydrogen tetracarbonylcobaltate ($\text{HCo}(\text{CO}{)}_4$) within the reaction mixture. These aldehydes are subsequently reduced to alcohols, which are vital for manufacturing solvents, plasticizers, and detergents.1234

Other Industrial Applications

• Petroleum Processing: Cobalt oxide is often combined with molybdenum trioxide and aluminum oxide to create catalysts used for desulfurizing liquids and gases, as well as for "reforming" crude petroleum fractions to improve their octane rating.4
• Hydrocarbon Synthesis: Cobalt-based catalysts, such as the cobalt-thoria-kieselguhr catalyst, are utilized in the synthesis of liquid hydrocarbons.5
• General Utility: Various other cobalt salts are employed as catalysts for a wide range of chemical reactions, including their use as drying agents in paints, varnishes, and inks.65