Topic
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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TL;DR: In this article, the authors explain the transition between the linear and parabolic time dependence of the wet oxidation of buried AlGaAs layers and explain the near-total suppression of wet oxidation by O2 is attributed to the suppression of volatile product formation through consumption of atomic hydrogen by reaction with O2 to form H2O in preference to the hydrogen reduction of As2O3.
Abstract: Wet oxidation of AlGaAs to form Al2O3 by the reduction of H+ from water to H produces intermediate As2O3. Reduction of As2O3 by H to elemental As enables the escape of arsenic from the oxidized film. Further reduction of As to AsH3 can provide another volatile As species. Formation of intermediate As is problematic for the use of wet oxidation in metal-insulator-semiconductor applications. The kinetic balance between As2O3 formation and As escape can explain the transition between the linear and parabolic time dependence of the wet oxidation of buried AlGaAs layers. The near-total suppression of wet oxidation by O2 is attributed to the suppression of volatile product formation through consumption of atomic hydrogen by reaction with O2 to form H2O in preference to the hydrogen reduction of As2O3.
53 citations
TL;DR: In this article, the influence of pH on the performance of copper-based catalysts was investigated in a cascade-bed reactor operating at 140°C using air as oxidant and showed that a higher pH reduces the rate of catalyst deactivation by preventing the leaching of the copper oxides and lengthening their lifetime.
53 citations
TL;DR: In this paper, the catalytic wet air oxidation (CWAO) of Olive Oil Mill wastewater (OMW) generated by the olive oil extraction industry constitutes a major pollutant, posing severe environmental threats.
Abstract: Olive oil mill wastewater (OMW) generated by the olive oil extraction industry constitutes a major pollutant, posing severe environmental threats. It contains a high organic load and phytotoxic and antibacterial phenolic compounds which resist biological degradation. Platinum and ruthenium supported titania or zirconia were studied in the catalytic wet air oxidation (CWAO) of OMWs in a batch reactor and in a continuous trickle-bed reactor. CWAO experiments at 190 °C and 70 bar total air pressure confirmed the effective elimination of the TOC (total organic carbon) and of the phenolic content of actual diluted OMW. Simultaneously, toxicity towards Vibrio fischeri was reduced and a decrease in phytotoxicity occurred. The ruthenium catalysts were found stable over a long period of operation in a trickle-bed reactor. The biodegradability of the oxidized waste has been enhanced and this study also examined the feasibility of coupling CWAO and an anaerobic digestion treatment. The pretreatment of the OMW in the presence of a ruthenium catalyst reduced considerably the total phenolic contents of the wastewater, and produced an effluent suitable to be treated by anaerobic treatment with increased biomethane production compared to the untreated effluent.
53 citations
TL;DR: Three preparative methods for the determination of mercury in soils and related materials were developed, two of which use acid digestion and wet oxidation and the other direct oxidation in an oxygenflask combustion technique.
53 citations
TL;DR: Ceria and doped ceria supported Pt and Ru catalysts were tested at 160°C in the Catalytic Wet Air Oxidation (CWAO) of phenol as mentioned in this paper.
Abstract: Ceria and doped ceria supported Pt and Ru catalysts were tested at 160 °C in the Catalytic Wet Air Oxidation (CWAO) of phenol. Catalysts were compared in terms of activity, selectivity and resistance towards fouling. The respective influences of metal phase and support were studied. Under the selected operating conditions, 100% phenol conversion could be reached. Contrary to what was expected, improved Oxygen Storage Capacities (OSC) accelerated the accumulation of adsorbed species on the catalyst surface, therefore limiting the catalytic performance. By contrast, high metal dispersions enhanced both the elimination of aqueous organic compounds and the degradation of heavy molecules involved in the catalyst fouling. The progressive decrease in activity induced by carbonaceous deposits could be kinetically modelled using a simple reaction scheme.
53 citations