Hydrogen peroxide decomposition in supercritical water

Croiset, Eric; Rice, Steven F.; Hanush, Russell G.

doi:10.1002/aic.690430919

Cited by 180 publications

(136 citation statements)

References 24 publications

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“…Thus, our catalytic capillary reactors proved to be a more efficient continuous flow reaction system, giving 99.9% H 2 O 2 decomposition at 20°C (Pt as catalyst), than noncatalytic reactors requiring harsh reaction conditions of 450°C and 30 34 MPa pressure to attain complete decomposition. 38 It is noteworthy that the newly plated Pd reactor (Figure 3a) required an induction period prior to reaching a steady decomposition state, whereas the Pt reactor did not. From the standard electrode potential, Pd (Pd(II) + 2e ¹ = Pd 0 , 0.92 V) is more susceptible to oxidation than Pt (Pt(II) + 2e ¹ = Pt 0 , 1.19 V).…”

Section: Resultsmentioning

confidence: 99%

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Javaid

Qazi

Kawasaki

2015

Bulletin of the Chemical Society of Japan

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The decomposition of hydrogen peroxide (H 2 O 2 ) was studied using a silica capillary tube (o.d. 0.45 mm, i.d. 0.33 mm, length 1000 mm) coated with a thin palladium (Pd) or platinum (Pt) layer. The inner walls of the capillary were coated with a homogenous thin layer of metal by electroless plating. This metal-coated capillary provided rapid and continuous decomposition of H 2 O 2 at room temperature within a residence time of 9.6 s, simply by passing the solution through the capillary. A capillary without Pd or Pt coating was unable to decompose H 2 O 2 even at 50°C. Pt proved to be a better catalyst than Pd. We also studied the effect of temperature, pH, concentration of H 2 O 2 and the residence time on decomposition of H 2 O 2 .

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Section: Resultsmentioning

confidence: 99%

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Javaid

Qazi

Kawasaki

2015

Bulletin of the Chemical Society of Japan

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“…1a. According to the study of Croiset (13) , H 2 O 2 could be completely decomposed in the preheating tube for various experimental conditions of this study. Ethanol feed stream was preheated through 2.0 m long coiled tube of 1.8 mm i.d.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 92%

Kinetics of Ethanol Oxidation in High-Pressure Steam

Koido

Hasegawa

2011

JTST

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Ethanol oxidation rate in high pressure steam at the pressure of 10 MPa in the temperature ranging from 430 to 490 °C was studied with the fuel equivalence ratio of 0.4. On the assumption that the reaction order is first order, the reaction rate parameters obtained in the experiments are 10 11.6 ± 0.4 s -1 for the pre-exponential factor and 166.5 ± 6.1 kJ·mol -1 for the activation energy. This ethanol oxidation rate in high-pressure steam was equivalent to that in supercritical water oxidation of ethanol. Liquid products were acetaldehyde and acetic acid and gas phase products were carbon monoxide, carbon dioxide, methane and ethane. A parallel reaction network of first order model well described the characteristics of the ethanol decomposition to acetaldehyde and acetic acid. Utilisation of the high-pressure steam oxidation process can overcome the problem of pressure tightness of the reactor in supercritical water oxidation, and the process can be employed in practical facilities.

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“…Hydrogen peroxide decomposition in supercritical water produces OH radical, which is extremely reactive. However, it is also very unstable and rapidly decomposes to oxygen [25], [26].…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

“…Then an amount of TOC, TN, and pH were measured in the raw landfill leachate sample as 8700 mg/L, 2800 mg/L and 6.3, respectively. In a typical experimental run, a given amount of undiluted leachate was mixed with a volume of 30 wt% hydrogen peroxide solution, according to the amount of oxidant excess and having into account the reactions for hydrogen peroxide decomposition in SCW [26] and TOC oxidation (Ecuations 3 and 4):…”

Section: Methodsmentioning

confidence: 99%

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Landfill leachate treatment by batch supercritical water oxidation

Cardona¹,

Buitrago²,

Acosta

2017

Cien.Ing.Neogranadina

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were measured in the reactor effluent samples and the combined effect of the studied factors was analyzed by means of the Analysis of Variance (ANOVA). Optimal operation conditions for TOC destruction were 400°C, 30 min and 100 % OE, being 500°C, 30 min and 100 % OE for TN destruction. Contrary to what has been reported in similar studies, the results suggest that it is possible to accomplish the simultaneous TOC and TN destruction in leachate wastewater by SCWO treatment at 400°C, 100 % OE and residence times longer than 30 min and without using a catalyst, either in batch or in a continuous process, as long as both the oxidant and the wastewater are mixed and heated together at the reaction temperature.Keywords: Landfill leachate, SCWO, TOC destruction, Total Nitrogen destruction. rEsumENEl tratamiento de lixiviados por medio de diferentes procesos fisicoquímicos y biológicos ha sido ampliamente estudiado. Sin embargo, ningún proceso logra las eficiencias de destrucción requeridas en cuanto a materia orgánica y nitrógeno, razón por la cual el tratamiento se realiza por medio de tecnologías combinadas. La oxidación en agua supercrítica o SCWO, proceso que se lleva a cabo a temperaturas y presiones superiores a las del punto crítico del agua en presencia de una fuente de oxígeno, se ha aplicado exitosamente al tratamiento de distintos tipos de aguas residuales de forma eficiente. Por lo tanto, este trabajo presenta un estudio experimental de la oxidación en agua supercrítica de lixiviados de relleno sanitario en un reactor batch, en el rango de temperatura de 400-500°C, tiempos de reacción de 15 a 30 minutos y excesos de oxígeno (OE) de 100 % a 300 %. Se midieron las eficiencias de destrucción de carbono orgánico total (COT) y nitrógeno total (NT), y se determinó el efecto combinado de los factores estudiados por medio del Análisis de Varianza (ANOVA). Las condiciones de operación óptimas para la destrucción de COT fueron 400°C, 30 min y 100 % OE, y 500°C, 30 min y 100 % OE para el NT. A diferencia de lo reportado en estudios similares, los resultados sugieren que es posible llevar a cabo la destrucción simultánea del COT y el NT en los lixiviados por medio de SCWO a 400°C, 100 % OE y tiempos de residencia de más de 30 min sin usar un catalizador, ya sea en un proceso batch o continuo, siempre y cuando tanto el oxidante como el agua residual se mezclen y se calienten juntos a la temperatura de reacción.Palabras clave: Lixiviados, SCWO, destrucción de COT, destrucción de nitrógeno total.

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Hydrogen peroxide decomposition in supercritical water

Cited by 180 publications

References 24 publications

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Kinetics of Ethanol Oxidation in High-Pressure Steam

Landfill leachate treatment by batch supercritical water oxidation

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