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: The Pd-Pt/Al 2 O 3 bimetallic catalysts showed high activities toward the wet oxidation of the reactive dyes in the presence of 1% H 2 together with excess oxygen as discussed by the authors.
17 citations
TL;DR: In this paper, a model for CO oxidation in the boundary layer of a single char particle was developed, which includes char oxidation and a 56 reaction gas phase kinetic scheme coupled with the diffusive properties of the 12 species involved in the CO oxidation.
Abstract: A model is developed for CO oxidation in the boundary layer of a single char particle. The model includes char oxidation and a 56 reaction gas phase kinetic scheme which is coupled with the diffusive properties of the 12 species involved in the CO oxidation. The model is compared with the experimental data of Tognotti and co-workers. The temperature reached on ignition, the resulting CO 2 /CO ratio, and the effect of changing water vapor concentrations are well described. Studies on the effect of water concentration show that significant CO oxidation at low temperatures requires a high surrounding water concentration. The presence of water vapor or hydrogen is found to be necessary to obtain a high degree of CO oxidation at low temperatures; however, there is a minimum temperature below which significant CO oxidation in the boundary layer does not occur irrespective of how high the water concentration is. In addition, CO oxidation is negligible even at a surface temperature as high as 2500 K when water and hydrogen are absent. The model has also been applied to predict the effects of changing parameters. Catalytic acceleration of the rate of carbon oxidation, for example by the addition of calcium, leads to both a high particle temperature overshoot and a significant increase in CO oxidation over the particle surface.
17 citations
TL;DR: In this paper, an integrated process has been proposed that combines FR as pretreatment of the catalytic wet oxidation (CWO) process using a commercial activated carbon as catalyst, placed in a continuous three-phase reactor at 16 bar.
Abstract: Catalytic wet oxidation (CWO) of 1000 mg/L of phenol (PhOH) aqueous solutions has been carried out using a commercial activated carbon as catalyst, placed in a continuous three-phase reactor at 16 bar, and temperature was changed in the interval 127−160 °C. Pure oxygen was fed as gaseous phase. Pollutant conversion, mineralization, intermediate distribution, and toxicity were measured at the reactor exit. The catalyst weight (W) to liquid flow rate (QL) ratio was varied from 0.3 to 17.5 gACmin/mL. Fenton reagent (FR) has been applied to the same phenolic aqueous samples using different amounts of H2O2 (between 10 and 100% of the stoichiometric dose) and 10 mg/L of Fe2+, in a batch way at 50 °C. An integrated process has been proposed that combines FR as pretreatment of the CWO process. In the FR step, 10% of H2O2, 10 mg/L of Fe2+, and reaction times shorter than 40 min are used. Efluent from FR step is fed to the CWO reactor at 127 °C. High mineralization (80−90%) and total detoxification of the effluent ...
17 citations
06 Mar 2015
17 citations
TL;DR: In this paper, the effect of wet oxidation on the chemical composition of intermediates and final products, as well as the evolution of sulphur, nitrogen, ions, Gross Calorific Value and the properties related to the subsequent handling and downstream processing of Kraft black liquor were discussed.
17 citations