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: This letter demonstrates a simple method to achieve high-yields of 1H semiconducting MoS2 monolayers in concentrated, colloidally-stable aqueous suspension based on oxidation suppression during the hydrothermal processing step used for metal-to-semiconductor phase reversion.
Abstract: This letter demonstrates a simple method to achieve high-yields of 1H semiconducting MoS2 monolayers in concentrated, colloidally-stable aqueous suspension. The method is based on oxidation suppression during the hydrothermal processing step used for metal-to-semiconductor phase reversion. Accompanying DFT calculations on elementary steps in the MoS2 wet oxidation reaction suggest that a two-site corrosion mechanism is responsible for the observed high reactivity and low stability of 1T metallic MoS2.
35 citations
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TL;DR: In this paper, it was shown that the addition of trace amounts of O $_2$ ( $≪1hbox%$ relative to N $_ 2$ ) to the process gas during the wet thermal oxidation of Al $_ x$ Ga $_1 -x$ As enhances the oxidation rates of lower Al content alloys, while decreasing the oxidation rate selectivity.
Abstract: We present data showing that the addition of trace amounts of O $_2$ ( $≪1hbox%$ relative to N $_2$ ) to N $_2+$ H $_2$ O process gas during the wet thermal oxidation of Al $_ x$ Ga $_1 -x$ As enhances the oxidation rates of lower Al content $( xle 0.8)$ alloys (a tenfold increase for $ x=0.3$ ), while decreasing the oxidation rate selectivity $ R( x=0.8)/ R( x=0.3)$ by a factor of seven. An increase in the refractive index from 1.49 to 1.68, and a fourfold decrease in surface roughness, indicates the formation of a denser, higher quality oxide for $ x=0.3$ AlGaAs. Oxides are characterized by prism coupling, atomic force microscopy, and scanning electron microscopy. Thermochemical calculations show a probable mechanism in the enhancement of the dry oxidation reactions of AlGaAs for low levels of O $_2$ , while there is still an adequate quantity of H $_2$ produced to reduce As oxides in the wet oxidation process. An AlGaAs quantum well heterostructure p-n laser diode crystal is nonselectively oxidized to create a deep oxide, high-index contrast waveguide with potential applications in semiconductor photonic integrated circuits that require small bend radius, high isolation, low crosstalk optical waveguides.
35 citations
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TL;DR: In this article, the basic subcritical wet oxidation process and the two main modifications (supercritical and catalytic oxidation) are briefly presented and design considerations of the processes and the oxidation kinetics which directly affects the reactor volume and process economics are also discusssed.
Abstract: The basic, subcritical wet oxidation process and the two main modifications (supercritical and catalytic oxidation) are briefly presented. Some design considerations of the processes and the oxidation kinetics which directly affects the reactor volume and process economics are also discusssed.
35 citations
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TL;DR: Two complementary wearing off cycling methods based on an initial wet oxidation in a sodium hypochlorite solution or an initial dry oxidation under air, both followed by a thermal pyrolysis under nitrogen, have been applied to a same carbon molecular sieve to study its gradual pore structure modifications.
35 citations
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TL;DR: A series of MnCeOx catalysts for the catalytic wet air oxidation (CWAO) of phenol is developed by a redox-precipitation preparation method as discussed by the authors.
Abstract: A series of MnCeOx catalysts for the catalytic wet air oxidation (CWAO) of phenol is developed by a redox-precipitation preparation method. Among them, Mn9Ce1Ox (Mn/Ce = 9:1) shows excellent activity and stability which can achieve TOC conversion of 88.1 % in 60 min at 70 °C and retain stable for five consecutive runs. Even at 50 °C, Mn9Ce1Ox can reach a phenol conversion of 84. 2% and a TOC conversion of 73.8 %. The roles of Mn valence state and Ce modification in the catalytic performance of Mn9Ce1Ox are extensively investigated by XRD, BET, Raman, H2-TPR and XPS. It is found that high Mn4+ concentration favors phenol adsorption and oxidation while high Mn3+ concentration favors oxygen activation. Ce optimizes the Mn4+/Mn3+ ratio and thus enhances catalytic activity. Additionally, Ce retains the structure of the catalyst and prevents Mn4+ and Mn3+ from being reduced to Mn2+, which contributes the good stability.
35 citations