Ni supported on Mg-Al oxides for continuous catalytic wet air oxidation of Crystal Violet

作者：Ovejero Gabriel^*; Rodriguez Araceli; Vallet Ana; Garcia Juan

来源：Applied Catalysis B: Environmental , 2012, 125: 166-171.

DOI：10.1016/j.apcatb.2012.05.030

• Catalytic wet air oxidation
• Crystal Violet
• Nickel
• Trickle-bed reactor
• Wastewater

The continuous catalytic oxidation of aqueous Crystal Violet (CV) solutions has been investigated using a nickel catalysts (7 wt%) supported over Mg-Al mixed oxides in a trickle-bed reactor. The influence of the temperature, pressure, gas flow and dye initial concentration were studied in the catalytic wet air oxidation of CV. The catalyst showed a very stable activity up to 350 h on stream with an average total organic carbon (TOC) conversion of 64%. CV and TOC removal were very sensitive to the temperature. Dye conversion augmented from 44.7% at 120 degrees C to 86.1% at 180 degrees C Dye conversion varied from 62.6 to 18.4%, TOC from 59.5 to 18.7% and TN from 66.6 to 14.0% within 10 to 50 ppm of initial dye concentration. The leaching of Ni was 6 wt% of the initial metal present in the catalyst and a 0.59% of carbonaceous deposit was formed onto the catalyst surface.

• 出版日期2012-8-21