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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 catalytic wet air oxidation of aqueous solution containing 1000 ppm aniline was conducted in a trickle-bed reactor packed with a novel nanocasted Mn-Ce-oxide catalyst prepared using SBA-15 silica as a hard template to provide the intrinsic performance of the catalysts.
Abstract: The catalytic wet air oxidation of aqueous solution containing 1000 ppm aniline was conducted in a trickle-bed reactor packed with a novel nanocasted Mn−Ce-oxide catalyst (surface area of 300 m2/g) prepared using SBA-15 silica as a hard template. A range of liquid hourly space velocities (5−20 h−1) and temperatures (110−140 °C) at 10 bar of oxygen were tested. The experiments were conducted to provide the intrinsic performance of the catalysts. Complete aniline conversion, 90% TOC conversion, and 80% nitrogen mineralization were achieved at 140 °C and 5 h−1. Blank experiments yielded relatively low homogeneous aniline (<35%) and negligible TOC conversions. Fast deactivation of the catalysts was experienced due to leaching caused by complexation with aniline. Acidification of the solution with HCl (molar HCl to aniline ratio of 1.2) was necessary to avoid colloidization and leaching of the nanoparticulate catalyst components. The catalyst displayed stable performance for over 200 h on stream.

39 citations

Journal ArticleDOI
TL;DR: In this article, the effects of two pre-treatment processes (alkaline wet oxidation and enzyme treatment with laccase) on lignocellulosic materials for applications in particleboards and fiberboards were evaluated.
Abstract: Wheat straw (Triticum aestivum) and beech (Fagus sylvatica), were used to evaluate the effects of two pre-treatment processes (alkaline wet oxidation and enzyme treatment with laccase) on lignocellulosic materials for applications in particleboards and fiberboards. Wheat straw and beech fibers reacted differently in the two processes. The chemical composition changed little following enzyme treatment. After alkaline wet oxidation, fibers enriched in cellulose were obtained. With both materials, almost all hemicellulose (80%) together with a large portion of the lignin were solubilised by alkaline wet oxidation, but essentially all cellulose remained in the solid fraction. Following enzyme treatment most material remained as a solid. For wheat straw, reaction with acetic anhydride indicated that both treatments resulted in more hydroxyl groups being accessible for reaction. The enzyme treatment gave a more reactive surface than alkaline wet oxidation for wheat straw, whereas the opposite was obser...

39 citations

Journal ArticleDOI
TL;DR: In this paper, carbon-supported iridium catalysts were used for catalytic wet air oxidation of butyric and iso-butyric acid aqueous solutions in a stirred reactor at 473 K and 0.69 MPa of oxygen partial pressure.
Abstract: Carbon-supported iridium catalysts were prepared by different incipient wetness impregnation methods and by organometallic chemical vapor deposition. The catalysts were characterized by N2 adsorption, TPD, SEM and H2 chemisorption measurements. The results obtained indicate a clear dependency of the metal-phase dispersion on the pre-treatment of the carbon support and the impregnation method. Their activity for catalytic wet air oxidation of butyric and iso-butyric acid aqueous solutions was investigated in a stirred reactor at 473 K and 0.69 MPa of oxygen partial pressure. The conversions obtained after 2 h were 43 and 52%, with respect to each carboxylic acid, when the most active catalysts were used. The measured conversions and initial reaction rates correlate well with the exposed metal area. A rate equation was determined from measurements of the initial reaction rates at different oxygen partial pressures, temperatures and catalyst mass loads. The results were modeled considering a heterogeneously catalyzed free-radical mechanism.

39 citations

Journal ArticleDOI
TL;DR: A commercial activated carbon, Industrial React FE01606A, was used as a catalyst in the wet oxidation of three dyes commonly found in textile wastewaters, Orange G, Methylene Blue, and Brilliant Green runs were carried out in a three phase fixed-bed reactor by feeding concurrently an aqueous phase containing 1000 mg/L of the dye and an oxygen gas flow rate of 90 mL/min Temperature was set to 160 °C, and the pressure in the reactor was fixed to 16 bar as mentioned in this paper.
Abstract: A commercial activated carbon, Industrial React FE01606A, without impregnation of any metal, was used as a catalyst in the wet oxidation of three dyes commonly found in textile wastewaters, Orange G, Methylene Blue, and Brilliant Green Runs were carried out in a three phase fixed-bed reactor by feeding concurrently an aqueous phase containing 1000 mg/L of the dye and an oxygen gas flow rate of 90 mL/min Temperature was set to 160 °C, and the pressure in the reactor was fixed to 16 bar The catalyst showed high catalytic activity in dye conversion and color removal The catalyst kept stable during the time tested on stream (200 h) Total decolorization is obtained at short residence times, but some refractory organic intermediates are obtained (mineralization achieved an asymptotic value about 40-60% depending on the dye) The toxicity of the inlet and outlet effluent was measured by the Microtox bioassay, and the oxidation intermediates identified and quantified explained the obtained toxicity evolution

38 citations

Journal ArticleDOI
TL;DR: A series of Ce x Zr 1− x O 2 mixedoxide-supported Ru catalysts were unprecedentedly evaluated in the catalytic wet air oxidation (CWAO) of 2-chlorophenol (2-CP) solutions.
Abstract: A series of Ce x Zr 1− x O 2 mixed-oxide-supported Ru catalysts were unprecedentedly evaluated in the catalytic wet air oxidation (CWAO) of 2-chlorophenol (2-CP) solutions (2 g L −1 ). They were shown to exhibit higher performances than the corresponding CeO 2 or ZrO 2 -supported catalysts. The ceria–zirconia solid solution structure appeared to be crucial for the higher activity of the 3 wt.% Ru/Ce x Zr 1− x O 2 catalysts. After introduction of praseodymium or neodymium in the Ce x Zr 1− x O 2 lattice, the activity of the 3 wt.% Ru/Ce x Zr 1− x O 2 catalysts was further improved. Pr was shown to have a greater effect than Nd, especially at low Pr concentration. Further investigations indicated that Ce x Zr 1− x O 2 solid solutions loaded Ru catalysts could maintain outstanding catalytic performances even at low temperature (393 K) and low pressure (3 MPa).

38 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202233
202171
202096
2019116
2018128