Aqueous phase catalytic oxidation of phenol in a trickle bed reactor: effect of the pH

Miró, C.; Alejandre, A; Fortuny, A.; Bengoa, Christophe; Font, Josep; Fabregat, Azael

doi:10.1016/s0043-1354(98)00296-6

Cited by 55 publications

(40 citation statements)

References 29 publications

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“…The deactivation of the Cu0803 catalyst has been related to the loss of active metal [7,8]. This commercial catalyst is manufactured to be used in gaseous processes so neither its mechanical strength nor its chemical stability are suitable for performing in aqueous phase.…”

Section: Resultsmentioning

confidence: 99%

“…Supported copper oxide catalysts have frequently been tested for the wet oxidation of organic compounds [2±6]. Despite the fact that copper-based catalysts are very active in batch processes, tests using continuous reactors reveal that there is a substantial loss of activity due to the dissolution of the catalytic species in the acidic reactive medium [7,8]. These apparently contradictory results can be explained by the different duration of the tests.…”

Section: Introductionmentioning

confidence: 99%

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Wet air oxidation of phenol using active carbon as catalyst

Fortuny

Font

1998

Applied Catalysis B: Environmental

174

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wet air oxidation of phenol using active carbon as catalyst

Fortuny

Font

1998

Applied Catalysis B: Environmental

174

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“…One of the most frequent reasons cited in literature for catalyst deactivation [10,18] is the leaching of the active phase (copper in this work). Moreover, it is well known that leaching of this metal from the solid catalyst to the liquid phase can be influenced by the pH of the media.…”

Section: Effect Of the Ph On The Catalyst Stabilitymentioning

confidence: 97%

“…Phenol was added to the different filtrates to get 1000 mg/L of phenol along with the copper dissolved. These solutions were fed to a reactor filled with glass beads, using a residence time of the liquid phase of 3.78 min under the experimental conditions given in table 1 (runs [17][18][19]. The phenol conversions obtained versus copper concentration in the fed solutions are shown in figure 4.…”

Section: Ph Influence On the Homogeneous Contributionmentioning

confidence: 99%

“…Therefore, the pH is a variable that should be taken into account since it has an important effect on copper leaching and, moreover, can modify the oxidation pathway of the phenol [15,16]. Only a few papers study the effect of pH on the CWO of phenol and these are focused on the influence of this variable on the phenol conversion [14,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Influence of pH on the wet oxidation of phenol with copper catalyst

et al. 2005

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This work reports the influence of pH on the catalytic wet oxidation (CWO) of phenol performed with a commercial copperbased catalyst. The results obtained show that pH is a critical parameter able to modify the chemical stability of the catalyst, the significance of the oxidation reaction in the liquid phase, the reaction mechanism and, consequently, the oxidation route of phenol. Experiments have been carried out to study the mentioned aspects. Stirred basket and fixed bed reactors (FBRs) have been employed, at 140°C and at 16 bar of oxygen pressure. Three initial pH values have been used: 6 (the pH of the phenol solution), 3.5 (adjusted by H 2 SO 4 ) and 8 (by addition of Na 2 CO 3 ). Furthermore, some phenol oxidation runs without solid catalyst but with different concentrations of copper in solution have been accomplish at pH o ¼ 3.5. At acid pH, important leaching of copper from the catalyst to the solution was achieved, finding this negligible at pH 8. It was found that the major contribution to the phenol conversion reached at acid pH by using the solid catalyst was due to the catalytic activity of the leached copper. Both oxidation mechanisms at acid and basic conditions have been elucidated to explain the differences in the type and distribution of the intermediates obtained. The catalytic phenol oxidation route found at pH ¼ 8 comprises intermediates less toxic than phenol while at acid pH the cyclic intermediates formed as first oxidation intermediates are far more toxic than phenol.

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Advances in active control of sound and vibration a special issue of Asian Journal of Control

2011

Asian Journal of Control

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Eine neue Familie von Polyoxometallaten wurde erschlossen durch die Synthese und strukturelle Charakterisierung der ersten Vanadium(IV)‐sulfit‐Heteropolyanionen. Das Bild zeigt eine sechskernige Vanadium(IV)‐Verbindung mit einem für solch eine Verbindung einzigartigen Strukturmotiv, einem kubischen {M4O2(OH)2}‐Fragment im Zentrum und Metallzentren an zwei der Ecken des Clusters. Diese Verbindung zeigt beim Abkühlen bis auf 2 K Ferromagnetismus.

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Aqueous phase catalytic oxidation of phenol in a trickle bed reactor: effect of the pH

Cited by 55 publications

References 29 publications

Wet air oxidation of phenol using active carbon as catalyst

Wet air oxidation of phenol using active carbon as catalyst

Influence of pH on the wet oxidation of phenol with copper catalyst

Advances in active control of sound and vibration a special issue of Asian Journal of Control

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