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 paper, the authors used activated carbon cloths (ACCs) as supports for Pd catalysts and showed that the oxygen-containing surface functional groups increase the selectivity of the catalysts by reducing the rate of water production.
Abstract: Activated carbon cloths (ACCs) were used as supports for Pd catalysts. The catalyst preparation was carried out by the impregnation method using acidic solution of palladium dichloride (PdCl2) as metal precursor. The effects of the oxidation state of the loaded metal, heat treatment of the catalysts in different atmosphere (H2, air) at different temperatures and surface chemistry of the support on the catalyst characterizations and the catalytic activities were investigated. Wet oxidation of ACC was done by nitric acid in order to induce oxygen-containing surface functional groups. Surface chemistry of the support and oxidation state of the metallic phase was investigated by means of XPS, TPD, SEM, DTA and TGA tests. Direct synthesis of hydrogen peroxide from H2 and O2 was performed batch wise in a stainless steel autoclave. The reactions were conducted under high pressure (38 bar) at 0 °C and methanol was used as reaction medium. The direct synthesis results showed that the oxygen-containing surface functional groups increase the selectivity of the catalysts by reducing the rate of water production. Existence of the oxidized state of Pd (PdO) also makes the catalyst more selective than the corresponding zerovalent state (Pd0). PdO affected on selectivity by increasing the rate of H2O2 production and reducing the amount of production of water, simultaneously.
22 citations
TL;DR: This work addresses the wet air oxidation (WAO) process for pre-treatment of phenolic wastewater effluents with the aim to increase biodegradability prior to a subsequent anaerobic stage.
22 citations
TL;DR: Different treatment routes have been studied for a mixed sludge: the conventional agricultural use is compared with the thermal oxidation processes, including incineration (in gaseous phase) and wet air oxidation (in liquid phase). The interest of a sludge digestion prior to the final treatment has been also considered according to the two major criteria, which are the fossil energy utilisation and the greenhouse effect gases (CO 2, CH 4, N 2 O) release.
22 citations
Patent•
03 Jun 1991TL;DR: In this paper, the authors describe a pre-assembled wet oxidation apparatus with its individual units, namely a high-pressure pump, a heat exchanger, a reactor, and a compressor for feeding an oxygen/gas mixture in one or two supporting flames.
Abstract: The apparatus (1) for wet oxidation is pre-assembled with its individual units, namely a high-pressure pump (2), a heat exchanger (3), a reactor (4) for the actual wet oxidation and a compressor (5) for feeding an oxygen/gas mixture, in one or two supporting flames and is accommodated in such a manner that its dimensions and its overall weight allow it to be transported on a road and/or rail vehicle, there advantageously being provided two such supporting flames in the form of standard containers (8 and 9), of which one may contain the reactor (4), divided into individual tube sections (6), and the heat exchanger (3), and the other may contain the remaining units, so that the entire apparatus can be pre-assembled into virtually operational condition and the two containers simply have to be set up, joined together and connected on site. Wet oxidation can thus be carried out even where relatively small quantities of medium are to be purified.
22 citations
TL;DR: In this paper, the authors investigated the use of nitrates as oxidant for removing recalcitrant pollutants at relatively low temperatures of 120˚C. The results showed that 50% of the chemical oxygen demand (COD) and 30% of dissolved organic carbon (DOC) could be eliminated within the first hour of reaction.
22 citations