Treatment of a non-azo dye aqueous solution by CWAO in continuous reactor using a Ni catalyst derived from hydrotalcite-like precursor.
Catalytic wet air oxidation (CWAO) of a Basic Yellow 11 (BY11) aqueous solution, chosen as a model of a hardly biodegradable non-azo dye was carried out in a continuous-flow trickle-bed reactor, using nickel supported over hydrotalcite precursor calcined at 550°C. An increase in the reaction temperature (120-180°C), and a decrease in dye concentration (1000-3000 ppm) or liquid flow rate (0.1-0.7 mL min(-1)) enhanced the CWAO performance in a 30 and 19% for the variation of the temperature and concentration respectively. After a small leaching observed within the first hours, the catalyst proved to be very stable during the 65-day reaction. The CWAO process was found to be very efficient, achieving BY11 conversion up to 95% and TOC conversion up to 85% at 0.1 mL min(-1) and 180°C under 5 MPa air.
Grupo de Catálisis y Procesos de Separación (CyPS), Departamento de Ingeniería Química, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid, Spain. avallet@quim.ucm.es
Ana
A
Vallet
Michèle
M
Besson
Gabriel
G
Ovejero
Juan
J
García
D000388:Air; D000536:Aluminum Hydroxide / Q000737:chemistry; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D006358:Hot Temperature; D007211:Indoles / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D004396:Coloring Agents; D007211:Indoles; D012996:Solutions; D014874:Water Pollutants, Chemical; C010467:hydrotalcite; C562161:basic yellow 11; D000536:Aluminum Hydroxide; D009532:Nickel; D009584:Nitrogen; D008276:Magnesium Hydroxide