Novel Ni−Fe-oxide systems for catalytic oxidation of cyanide in an aqueous phase

• Authors: Maria Stoyanova , Stoyanka Christoskova
• Languages of publication: EN

Abstracts

EN

Catalytic activity of mixed Ni−Fe oxide systems with respect to air oxidation of aqueous cyanide solution at 308 K was investigated. The catalysts employed were prepared by an oxidation-precipitation method at room temperature and were characterized by powder X-ray diffraction (XRD), Mössbauer spectroscopy, and chemical analysis. The cyanide oxidation rate was found to be dependent on the catalyst's calcination temperature, pH of the medium, and catalyst loading. Results revealed that the catalyst calcined at 120°C is the most active where up to 90% of free cyanide (4 mM) was removed after oxidation for 30 minutes in the presence of 2.5 g/L catalyst at pH 9.5. The cyanide conversion becomes less favorable as the pH of the solution increases (with other constant parameters). The selectivity data showed that carbon dioxide is the main oxidation product, regardless of pH of the solution.

Keywords

EN

Cyanide oxidation; iron-modified nickel oxide system; catalyst; kinetics study

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2005
• Volume: 3
• Issue: 2
• Pages: 295-310

Dates

published

1 - 6 - 2005

online

1 - 6 - 2005

Contributors

author

Maria Stoyanova

• Department of Physical Chemistry, Paisii Hilendarski University of Poovdiv, 24 Tzar Assen Street, 4000, Plovdiv, Bulgaria

author

Stoyanka Christoskova

• Department of Physical Chemistry, Paisii Hilendarski University of Poovdiv, 24 Tzar Assen Street, 4000, Plovdiv, Bulgaria

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Identifiers

DOI

10.2478/BF02475998