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 work demonstrated no enhancement of acetic acid production by the two-stage concept compared with the single stage wet oxidation process, in contrast to similar work by other researchers, investigated on carbohydrate biomass and vegetable wastes using hydrogen peroxide as the oxidant.
21 citations
TL;DR: In this paper, the first evidence of sonochemical activity under hydrothermal conditions was reported for the first time, using 20 kHz power ultrasound at 200 °C and 13 bar in the presence of argon.
Abstract: We report for the first time evidence of sonochemical activity under hydrothermal conditions. Sonolysis of H2O and D2O using 20 kHz power ultrasound at 200 °C and 13 bar in the presence of argon yields H2 and D2 respectively. Formation of hydrogen peroxide is not observed because of its thermal instability. The simultaneous sonohydrothermal treatment was used for the preparation of Ce0.5Zr0.5O2 nanocrystalline mixed oxide with external mesoporous surface area higher than that of similar material prepared by ultrasonically assisted coprecipitation followed by hydrothermal treatment. The obtained mixed oxide loaded with 1.5 wt % of platinum exhibits high activity and stability in catalytic wet air oxidation of formic acid at low temperature.
21 citations
TL;DR: In this paper, the authors show that when the nanoparticles are composed of metallic Pt, the optimum support is hydrophobic, but when they are ionic Ru, a hydrophilic support is more effective.
Abstract: Support wettability can play a key role in directing the activation of oxygen during catalytic wet air oxidation over nanoparticle catalysts. When the nanoparticles are composed of metallic Pt, the optimum support is hydrophobic, but when they are ionic Ru, a hydrophilic support is more effective. This reversal in support effect is consistent with two distinct surface pathways: one in which gas-phase O2 is directly adsorbed on the Pt0 surface and the other in which dissolved O2 is activated on RuO2 immersed in the contaminated aqueous phase. The known effects of ceria on these precious metal catalysts are of secondary importance to support wettability.
21 citations
TL;DR: The CWAO process can be used to remove dyes from wastewater using the HTNi catalyst, which is very active for organic matter and toxicity removal in wastewaters.
Abstract: Background, aim, and scope
Textile industry produces wastewater which contributes to water pollution since it utilizes a lot of chemicals. Preliminary studies show that the wastewater from textile industries contains grease, wax, surfactant, and dyes. The objective of this study was to determine the treatment efficiency of the nickel catalysts supported on hydrotalcites in three-dye model compounds and two types of wastewater.
21 citations
TL;DR: In this paper, the effectiveness of an advanced sludge treatment technology (Wet Oxidation, WO) is presented by analyzing experimental studies at the lab scale and data collected during years of industrial-scale activities.
Abstract: In this article, the effectiveness of an advanced sludge treatment technology (Wet Oxidation, WO) is presented by analyzing experimental studies at the lab scale and data collected during years of industrial-scale activities. The data showed good performances of WO on COD and VSS removal efficiencies—about 65–70% and 95–98%, respectively—and the effect of operating parameters (i.e., temperature and reaction time) on process efficiencies was highlighted. The energy balance of the WO systems indicated that about 90% of the energy entering the system may be recovered. Finally, a techno-economic assessment showed that WO can be a suitable solution for sludge treatment and minimization.
21 citations