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 investigated the catalytic activity of a Pt-Pd-Ce/alumina catalyst for wet catalytic oxidation of black liquor in a slurry reactor at a temperature range 433-463 K and at pressures from 1.5 to 2.2 MPa.
Abstract: The catalytic oxidation of industrial wastewater from paper and pulp mills has been investigated in a slurry reactor at a temperature range 433–463 K and at pressures from 1.5 to 2.2 MPa. Adding Ce on alumina support promotes the catalytic activity for oxidation of black liquor. Pt–Pd–Ce/alumina catalyst shows a promising activity for wet catalytic oxidation of black liquor. The oxidation reaction over a Pt–Pd–Ce catalyst is characterized by an initial fast reaction step followed by a slow reaction step. The rate of total organic carbon (TOC) reduction was described by first-order kinetics with respect to TOC concentration in black liquor for both initial and later reaction steps. The activation energies were determined to be 54.53 and 50.13 kJ/mol for the initial and later oxidation steps, respectively. Comparison of the data with the generalized kinetic model was also presented.
42 citations
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TL;DR: Pt, Pd and Ru catalysts supported on carbon black composites (CBC) were characterized in the wet air oxidation of phenol solution using a fixed-bed reactor working in a trickle-flow regime under relatively mild conditions.
42 citations
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TL;DR: It was found that the process severity has a significant influence on the formation and degradation of these intermediate products.
42 citations
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TL;DR: In this article, a first-order, two-stage kinetics in terms of the component or COD concentration was analyzed for high concentration chemical wastewater containing phenol and/or phenolic compounds by catalytic wet air oxidation.
Abstract: Treatment of high concentration chemical wastewater containing phenol and/or phenolic compounds by catalytic wet air oxidation (WAO) is studied. Experimental results indicate that over 99% w/w removal of phenol or phenolic compounds can be efficiently achieved by the catalytic WAO process utilizing hydrogen peroxide as homogeneous oxidant. It is observed that the catalytic WAO process achieves high efficiency of phenol or phenolic compound oxidation at lower operating temperature (150°C or less) and pressure (0.5 MPa) than those of comparable conventional WAO processes. The experimental data also show that the oxidation reaction can be represented by a first-order, two-stage kinetics in terms of the component or COD concentration. The second-stage oxidation was observed to be slower than the first-stage. The activation energies obtained for oxidation of phenol and phenolic coumpounds reflect the speed of these two stage reactions.
42 citations
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TL;DR: In this paper, color control of white photoluminescence (PL) from carbon-incorporated silicon oxide was demonstrated, and it was shown that PL color can be controlled in the range of blue-white and yellow-white by selecting the porosity of starting porous silicon as well as the carbonization and oxidation temperatures.
Abstract: Color control of the white photoluminescence (PL) from carbon-incorporated silicon oxide is demonstrated. The carbon-incorporated silicon oxide was fabricated by carbonization of porous silicon in acetylene flow (at 650 and 850 °C) followed by wet oxidation (at 650 and 800 °C). It was shown that PL color can be controlled in the range of blue-white and yellow-white by selecting the porosity of starting porous silicon as well as the carbonization and oxidation temperatures. Low-temperature oxidation resulted in bluish light emission in lower porosity series, while high-temperature oxidation promoted yellow-white light emission. The maximal integral intensity of PL was observed after oxidation at 800 °C. It was shown that white PL from carbon-incorporated silicon oxide has blue and yellow-white PL bands originating from different light-emitting centers. The origin of blue PL is attributed to defects in silicon dioxide. Some trap levels at the interface of the carbon clusters and silicon oxide are suggested ...
42 citations