Wet oxidation

About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.

A method of highly efficient hydrolyzation oxidation of III–V semiconductor lattice matched to indium phosphide

Abstract: We have demonstrated a method of efficient wet oxidation process for devices grown on indium phosphide. It was found that oxidation of a strain compensated InAs/AlAs short-period superlattice grown on InP proceeds at a rate of 0.28 μm/min. An edge-emitting laser using current confinement provided by the oxide has been fabricated. This method might be also well suited for long wavelength vertical cavity surface emitting laser application.

Synthesis of highly active and stable Al/Zr pillared clay as catalyst for catalytic wet oxidation of phenol

Abstract: Natural bentonite clay was used in the synthesis of single and mixed oxide Al/Zr pillared clay catalysts by means of ultrasonic treatment during the aging and intercalation steps. The raw bentonite and pillared clay catalysts were characterized using high resolution scanning electron microscopy with energy dispersive system (HRSEM-EDS), powder X-ray diffraction (PXRD), N2 adsorption/desorption, Fourier transform infrared spectroscopy, thermogravimetric analysis, cation exchange capacity, zeta potential and all the catalysts evaluated in the catalytic wet air oxidation (CWAO) of phenol. Calcination of the synthesized Al/Zr-PILCs at 500 °C for 120 min yielded optimum physical properties with BET surface area of 230 m2/g, pore volume of 0.115 cm3/g and basal spacing of 1.92 nm and with good thermal stability. Complete removal of phenol was obtained after 120 min and 88% TOC was removed after 180 min in aqueous solution under mild reaction conditions of 100 °C and 10 bar after. Catalyst reusability studies showed that the Al/Zr-PILCs catalyst demonstrated excellent chemical and structural stability with insignificant leaching of Zr4+ after six consecutive catalytic runs. The Al/Zr-PILCs catalyst therefore demonstrated excellent catalytic properties in the CWAO of phenol in aqueous solution.

Method and device for degrading pollutants through ultraviolet catalytic wet oxidation

Abstract: The invention discloses a method for rapidly and efficiently degrading pollutants through ultraviolet catalytic wet oxidation at the normal temperature and normal pressure and designs a typical device for implementing the method. In the method, ultraviolet light, an oxidant and a catalyst are introduced into a reaction system; and a wet oxidation reaction can be performed under the mild conditions of normal temperature and normal pressure by utilizing the synergistic catalytic oxidation of the ultraviolet light, the oxidant and the catalyst. Compared with the traditional catalytic wet oxidation method which needs to be implemented under the reaction conditions of high temperature and high pressure, the method can be implemented under the conditions of a temperature of between 25 and 80 DEG C and normal pressure, wherein organic pollutants in high-concentration toxic and hazardous waste water can be decomposed to be harmless components such as carbon dioxide (CO2), water and the like through the high oxidizing property; and the removal rate of chemical oxygen demand (COD) chromium (Cr) after the treatment of a plurality of representative high-concentration organic waste water can reach over 95 percent, and the biochemical property can be improved obviously. The method has the advantages of mild reaction, high treating efficiency, complete degradation, clean and environmental-friendly process, energy conservation and wide application prospect.

Effect of transition metal impregnation on oxidative regeneration of activated carbon by catalytic wet air oxidation

Abstract: Impregnation of a commercial activated carbon (AC) with transition metals was investigated to extend its reuse as phenol adsorbent after regeneration by catalytic wet air oxidation (CWAO). Iron and copper catalysts were prepared with varied metal dispersions and oxidation states by using different heat treatments. The main feature of the iron catalysts was to reduce the phenol oligomerization due to oxidative coupling, while the copper catalyst was prone to leaching promoting homogeneous reaction. However their regeneration efficiency was not significantly improved with respect to the starting AC due to an increased adverse effect of CWAO itself on their adsorptive properties.

Pulsed corona discharge oxidation of aqueous lignin: decomposition and aldehydes formation.

Abstract: Lignin is the mass waste product of pulp and paper industry mostly incinerated for energy recovery. Lignin is, however, a substantial source of raw material for derivatives currently produced in costly wet oxidation processes. The pulsed corona discharge (PCD) for the first time was applied to lignin oxidation aiming a cost-effective environmentally friendly lignin removal and transformation to aldehydes. The experimental research into treatment of coniferous kraft lignin aqueous solutions was undertaken to establish the dependence of lignin oxidation and aldehyde formation on the discharge parameters, initial concentration of lignin and gas phase composition. The rate and the energy efficiency of lignin oxidation increased with increasing oxygen concentration reaching up to 82 g kW−1 h−1 in 89% vol. oxygen. Oxidation energy efficiency in PCD treatment exceeds the one for conventional ozonation by the factor of two under the experimental conditions. Oxidation at low oxygen concentrations showed a tendency...