Open Collections

Reduction of aqueous cobaltous sulfate by carbon monoxide

University of British Columbia

This is a study of the catalysed reduction of cobalt (IT) to metal by carbon monoxide from aqueous, ammoniacal solutions between 180 and 230°C and from 0 to 50 atm. CO. The reaction proceeds through the intermediate formation of a cobalt carbonyl anion. Under the conditions of this study this intermediate is produced homogeneously, and also heterogeneously in the presence of cobalt sulfide. Metal formation occurs only in the presence of cobalt sulfide. The stoichiometry of the production of cobalt carbonyl anion is consistent with the equation. [ Equation omitted ] Metal formation follows stoichiometry of the equation [ Equation omitted ] The following equations represent a mechanism that is consistent with the kinetic observations: [ Equations omitted ] A side reaction involving carbon monoxide and hydroxyl ion produces formate ion, In the presence of cobalt sulfide, hydrogen rather than formate ion is the product. The following equations represent a mechanism that is consistent with experimental observations: [ Equations omitted ] A method for the separation of cobalt (II) from nickel (II) in aqueous solution is suggested.

Text

2011-08-30

For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

http://hdl.handle.net/2429/36985

Metals and Materials Engineering

University of British Columbia

Graduate