Catalytic wet air oxidation of carboxylic acids at atmospheric pressure

2000 ◽  
Vol 63 (2-4) ◽  
pp. 249-255 ◽  
Author(s):  
Dong-Keun Lee ◽  
Dul-Sun Kim
Keyword(s):  
Carboxylic Acids ◽  
Atmospheric Pressure ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation

Catalytic Wet Air Oxidation of Oxalic Acid at Atmospheric Pressure

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Gonul Gunduz ◽  
Meral Dukkanci
Keyword(s):  
Oxalic Acid ◽  
Atmospheric Pressure ◽  
Free Radical Oxidation ◽  
Acid Oxidation ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Radical Oxidation ◽  
Stirred Reactor ◽  
Mass Loads

Catalytic wet air oxidation of oxalic acid in aqueous solution was investigated in a stirred reactor over a Pt (0.7% in wt)/Al2O3 catalyst at atmospheric pressure, in a concentration range of oxalic acid of 500-3000 ppm, and at a temperature range of 313-353 K. The conversions obtained after 5 h were 28.96 %, 45.98 % and 30.74 % for initial concentrations of 500, 1500, 3000 ppm, respectively. A rate equation of oxalic acid oxidation, in mol.h-1.g-1Pt was determined from measurements of initial rates, at different initial concentrations of oxalic acid, temperatures and catalyst mass loads. The activation energy for oxalic acid conversion was found to be 24.6 kJ mol-1.The heterogeneous catalyzed free-radical oxidation of oxalic acid was discussed.

scholarly journals Influence of the Active Phase (Fe, Ni, and Ni–Fe) of Mixed Oxides in CWAO of Crystal Violet

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1053 ◽  
Author(s):  
Katherine Archila ◽  
Ana María Campos ◽  
Lorena Lugo ◽  
Crispín Astolfo Celis ◽  
Sonia Moreno ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Atmospheric Pressure ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Oxygen Demand ◽  
Textural Properties ◽  
Active Phase ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation

The catalytic oxidation of aqueous crystal violet (CV) solutions was investigated using Ni and Fe catalysts supported over Mg–Al oxides synthesized by the autocombustion method. The influence of temperature, loading, and selectivity were studied in the catalytic wet air oxidation (CWAO) of CV. The kind of metal had an important contribution in the redox process as significant differences were observed between Fe, Ni, and their mixtures. The catalysts with only Fe as active phase were more efficient for the oxidation of CV under normal conditions (T = 25 °C and atmospheric pressure) compared to those containing Ni, revealing the influence of the transition metal on catalytic properties. It was found that iron-containing materials displayed enhanced textural properties. The synthesis of Fe/MgAl catalysts by the autocombustion method led to solids with excellent catalytic behavior, 100% CV degradation in eight hours of reaction, 68% selectivity to CO2, and significant reduction of chemical oxygen demand (COD).

Catalytic Wet Air Oxidation of Carboxylic Acids on TiO2-Supported Ruthenium Catalysts

1999 ◽  
Vol 182 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Jean-Christophe Béziat ◽  
Michèle Besson ◽  
Pierre Gallezot ◽  
Sylvain Durécu
Keyword(s):  
Carboxylic Acids ◽  
Ruthenium Catalysts ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation
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