Mn-Cu and Mn-Ce Composite Oxides for Decolouration of Acid Red 186 Solutions by CWO

Isabel M. L. Castelo-Branco, Department of Chemical Engineering, University of Coimbra
Rosa M. Quinta-Ferreira, Department of Chemical Engineering, University of Coimbra

Abstract

Decolouration by catalytic oxidation of Acid Red 186 dye solutions was investigated using several manganese-based heterogeneous catalysts, namely MnOx (manganese oxides), Mn-Cu and Mn-Ce composite oxides. Also, catalytic activity of CeO_{2 and CuOx (copper oxides) were tested. Catalysts were used in slurry conditions, at 130ºC and oxygen partial pressure of 15 bar. Additional uncatalysed run and thermolysis (no catalyst, no oxygen) were studied. The results revealed that MnOx and Mn-Cu were the most active catalysts concerning the reduction of colour. MnCu5 and CuOx led to the highest TOC decreases. From the overall process (colour and TOC reductions) and having in consideration catalyst stability, MnCu5 was considered suitable to AR186 oxidation.}

Recommended Citation

Castelo-Branco, Isabel M. L. and Quinta-Ferreira, Rosa M. (2007) "Mn-Cu and Mn-Ce Composite Oxides for Decolouration of Acid Red 186 Solutions by CWO," International Journal of Chemical Reactor Engineering: Vol. 5: A28.
Available at: http://www.bepress.com/ijcre/vol5/A28

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