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Wet oxidation

About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.


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Journal ArticleDOI
TL;DR: Pt/TiO2-Ce catalysts were synthesized with different concentrations of Ce at 1, 3, 5 and 10% for being used in catalytic wet air oxidation (CWAO) of aqueous solution of phenol (1000ppm) as mentioned in this paper.

58 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of temperature and oxygen partial pressure on the continuous catalytic wet air oxidation (CWAO) over activated carbon (AC) has been investigated for the removal of phenol, o-cresol and 2-chlorophenol in aqueous solutions.

57 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that using hydrogen peroxide (0.01 M) as a hydroxyl radical promoter is able to provide an additional 15% increase in the final COD removal achieved.
Abstract: Landfill leachates of the city of Badajoz (in the southwest of Spain) have been treated by wet air oxidation at high temperature (180−270 °C) and pressure (40−70 atm). Typical operating variables such as temperature and oxygen partial pressure have been investigated with no effect of any being found and moderate to low chemical oxygen demand conversions (20−30% depending on initial COD concentration). Initial pH shows a positive influence when acidic conditions are used. Addition of hydrogen peroxide (0.01 M) as a hydroxyl radical promoter is able to provide an additional 15% increase in the final COD removal achieved. If a sulfate radical promoter is used (i.e., Oxone) the process is significantly improved, with COD conversions in the range 60−80%, also depending on the initial COD of the leachates. A first attempt to comprehend the chemistry of this oxidizing system suggests an instantaneous decomposition of Oxone that initiates the radical chain also involving hydroxyl and organic radicals.

57 citations

Journal ArticleDOI
TL;DR: In this article, the effect of the O 2 and H 2 O content on the oxidation behavior of the 9%Cr steel P91 was studied in the temperature range of 600-800°C.
Abstract: The effect of the O 2 and H 2 O content on the oxidation behavior of the 9%Cr steel P91 was studied in the temperature range of 600-800°C. The oxidation rates under the various experimental conditions were determined by in-situ thermogravimetry. In dry oxygen a protective scale growth occurs with an oxidation rate controlled by diffusion in the scale. In presence of water vapor, after an incubation period, the scales become non-protective, as a result of a change of the oxidation limiting process. The water vapor effect is especially apparent in the temperature range of 600-700°C, whereas at higher temperatures hardly any effect was found. The destruction of the protective scale by water vapor does not only depend on the H 2 O content but also on the H 2 O/O 2 -ratio.

57 citations

Journal ArticleDOI
TL;DR: In this article, the influence of surface oxides of activated carbon (AC) was experimentally studied to ascertain the adsorption characteristics of hydrogen, and the results revealed that specific surface area and micropore volume of oxidized ACs slightly changed after lower temperatures (below 323 K), however, drastically decreased after oxidation at 373 K. The total acidity greatly increases due to wet oxidation.

57 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202233
202171
202096
2019116
2018128