Microwave assisted catalytic wet air oxidation of H-acid in aqueous solution under the atmospheric pressure using activated carbon as catalyst

Sol-gel Zr0.1Ce0.9O2 and Zr0.1(Ce0.75Pr0.25)O2 mixed oxides and coprecipitated pure ceria CeO2 displaying the fluorine type structure have been used as platinum or ruthenium catalysts’ supports for catalytic wet air oxidation (CWAO) of aqueous solution of acetic acid (78 mmol.L-1). These catalysts were prepared by conventional impregnation (5 wt-%) from platinum and ruthenium precursor salts or by exchange (~2 wt-%) in the case of ruthenium. A screening of catalysts in CWAO at 200°C under 2 MPa was performed and reveals that the best platinum catalyst is supported on pure ceria displaying large surface. For ruthenium catalysts, the highest conversion after 3 hours of reaction has been reached by the Ru/Zr-Ce-O system.

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Catalytic wet air oxidation of substituted phenols using activated carbon as catalyst

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2004.11.017 ◽

2005 ◽

Vol 58 (1-2) ◽

pp. 105-114 ◽

Cited By ~ 75

Author(s):

M. Eugenia Suarez-Ojeda ◽

Frank Stüber ◽

Agustí Fortuny ◽

Azael Fabregat ◽

Julián Carrera ◽

...

Keyword(s):

Activated Carbon ◽

Catalytic Wet Air Oxidation ◽

Air Oxidation ◽

Wet Air Oxidation ◽

Substituted Phenols

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Degradation of Cationic Red GTL by Catalytic Wet Air Oxidation over Mo–Zn–Al–O Catalyst under Room Temperature and Atmospheric pressure

Environmental Science & Technology ◽

10.1021/es203531q ◽

2012 ◽

Vol 46 (5) ◽

pp. 2856-2863 ◽

Cited By ~ 37

Author(s):

Yin Xu ◽

Xiaoyi Li ◽

Xiang Cheng ◽

Dezhi Sun ◽

Xueye Wang

Keyword(s):

Atmospheric Pressure ◽

Room Temperature ◽

Catalytic Wet Air Oxidation ◽

Air Oxidation ◽

Wet Air Oxidation

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Catalytic Wet Air Oxidation of Oxalic Acid at Atmospheric Pressure

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1423 ◽

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.

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

Catalysts ◽

10.3390/catal10091053 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1053 ◽

Cited By ~ 1

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).

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