Catalytic wet oxidations of phenol‐ and <i>p</i>‐chlorophenol‐contaminated waters

Chang, Chiehmign J.; Li, Shiow-Shya; Ko, Ching-Ming

doi:10.1002/jctb.280640306

Cited by 50 publications

(25 citation statements)

References 18 publications

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“…Firstly, according to Arrhenius' law the higher the reaction temperature, the faster the reaction is. Secondly, above 100 • C, the oxygen solubility in water increases with temperature [25]. But, from a practical point of view, one must keep in mind that the higher the reaction temperature, the more stringent the corrosion problems.…”

Section: Effect Of the Reaction Temperaturementioning

confidence: 99%

Active carbon–ceramic sphere as support of ruthenium catalysts for catalytic wet air oxidation (CWAO) of resin effluent

Liu

2010

Journal of Hazardous Materials

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Section: Effect Of the Reaction Temperaturementioning

confidence: 99%

Active carbon–ceramic sphere as support of ruthenium catalysts for catalytic wet air oxidation (CWAO) of resin effluent

Liu

2010

Journal of Hazardous Materials

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“…Recent examples of application include herbicide removal [1], pulp and paper mill effluent [2], printing and dyeing wastewaters from the textile industry [3], alkaloid factory wastewater [4], and wastewaters from nuclear fuel processing plants [5]. Although, some very active homogeneous catalysts can be used, such as copper [6] and iron salts [7], they need to be separated from the treated effluent, which is a drawback for industrial applications. In order to avoid this problem, efficient heterogeneous catalysts have been reported such as Mn/Ce [8], Co/Bi [9] or supported copper oxides [10].…”

Section: Introductionmentioning

confidence: 99%

Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids

et al. 2005

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Carbon supported platinum (1% wt) catalysts were prepared by the incipient wetness impregnation method and by organometallic chemical vapor deposition. Catalyst characterization was carried out by means of adsorption and thermogravimetric techniques, and by electron microscopy. The catalyst with higher metal dispersion was produced by incipient wetness impregnation. The catalysts were tested in the catalytic wet air oxidation (200°C and 6.9 bar of oxygen partial pressure) of aqueous solutions containing low molecular weight (C 2 to C 4 ) carboxylic acids. Significant conversions (greater than 60% over 2 h) and 100% selectivity towards water and non-carboxylic acid products were observed for both systems. The initial reaction rate was used to compare the performance of the two catalytic materials and direct correspondence to the metal dispersion was found. No metal leaching was observed during reaction and no significant deactivation occurred in three successive catalytic oxidation runs. A kinetic model based on the Langmuir-Hinshelwood formulation was applied and the results were analyzed in terms of a heterogeneously catalyzed free radical mechanism.KEY WORDS: catalytic wet air oxidation (CWAO); carbon supported platinum catalysts; incipient wetness impregnation; organometallic chemical vapor deposition (OMCVD)

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“…Thus, when the highest yield of acetic acid was obtained, a higher yield of formic acid could only be obtained by finding a way of preventing its oxidative decomposition. Effect of NaOH catalyst Some reports claim that alkali accelerates the decomposition of organic compounds [12,13]. In this study, alkali was used to accelerate the decomposition of phenol, and thus increase the yields of formic and acetic acids.…”

Section: Effect Of Oxygen Supplymentioning

confidence: 99%

Production of formic and acetic acids from phenol by hydrothermal oxidation

Cao

et al. 2011

Res Chem Intermed

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Hydrothermal technology is a core environmental-protection technique which can be used for waste water treatment and biomass conversion. In this paper a novel idea, alkaline hydrothermal oxidation, is proposed for producing formic and acetic acids from wastewater containing phenolic compounds. The effects of the most important conditions-reaction temperature, reaction time, oxygen supply, and type of alkaline catalyst-on yields of formic and acetic acids were investigated. The results indicated that the optimum conditions for production of formic and acetic acids were: reaction temperature 300°C, reaction time 90 s, H 2 O 2 equivalent to 60% oxygen, and NaOH concentration 1.5 mmol. Under the optimum conditions the yields of formic and acetic acids reached 4.8 and 23.5%, respectively. In addition, the effect of different alkalis on yields of formic and acetic acids was also investigated. The results showed that compared with use of NaOH addition of KOH had a more pronounced effect on improving the yield of acetic acid. This research indicated that high-value-added formic and acetic acids can be recovered as resources by hydrothermal oxidation of phenolic wastewater, and thus hydrothermal oxidation has high potential for converting phenolic compounds in wastewater into value-added products.

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Catalytic wet oxidations of phenol‐ and p‐chlorophenol‐contaminated waters

Cited by 50 publications

References 18 publications

Active carbon–ceramic sphere as support of ruthenium catalysts for catalytic wet air oxidation (CWAO) of resin effluent

Active carbon–ceramic sphere as support of ruthenium catalysts for catalytic wet air oxidation (CWAO) of resin effluent

Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids

Production of formic and acetic acids from phenol by hydrothermal oxidation

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