Kinetic modeling for wet air oxidation of formic acid on a carbon supported platinum catalyst

Harmsen, Jma Jan; Jelemenský, Ľudovít; Andel-Scheffer, van Pjm; Kuster, Bfm Ben; Marin, Gbmm Guy

doi:10.1016/s0926-860x(97)00232-9

Cited by 36 publications

(13 citation statements)

References 15 publications

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“…Based on the pioneer work of Devlin and Harris [207] on phenol WAO, detailed oxidation pathways of pure phenol [64,65,79,119,122,125,160,[208][209][210][211], phenolic compounds [64,124,212] and carboxylic acids [72,122,125,127,130] were experimentally assessed for different catalysts including activated carbon [79,160] and activated carbon supported Ru, Pt, Pd metals [119,122,125,127,130,211]. The distribution of partial oxidation products obtained in phenol CWAO essentially involved the same species as those found by Devlin and Harris.…”

Section: Cwao Kinetic Modellingmentioning

confidence: 99%

“…A wide scenario of L-H expressions can be established, although the most popular used in CWAO considered only the competitive adsorption of organic reactants on the same active site, ignoring the existing adsorption of dissolved molecular oxygen. More realistic kinetic models including the participation of adsorbed oxygen in the mechanism were also reported [127,217,218]. For example, Harmsen et al [127] proposed a detailed kinetic model of several elementary steps for the CWAO of formic acid over a carbon supported platinum catalyst at ambient temperatures.…”

Section: Cwao Kinetic Modellingmentioning

confidence: 99%

“…More realistic kinetic models including the participation of adsorbed oxygen in the mechanism were also reported [127,217,218]. For example, Harmsen et al [127] proposed a detailed kinetic model of several elementary steps for the CWAO of formic acid over a carbon supported platinum catalyst at ambient temperatures. The adsorption isotherms were assumed to be of the L-H type and the surface reaction occurred between adsorbed oxygen atoms and free formate ions in the liquid phase.…”

Section: Cwao Kinetic Modellingmentioning

confidence: 99%

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Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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Section: Cwao Kinetic Modellingmentioning

confidence: 99%

Section: Cwao Kinetic Modellingmentioning

confidence: 99%

Section: Cwao Kinetic Modellingmentioning

confidence: 99%

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Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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“…Catalytic-wet-air-oxidation (CWAO) using air and supported catalysts is an attractive method for the treatment of effluents, aiming at removal of the total organic compounds (TOC) where the concentration of organic polluents is too low to justify an incineration process and too toxic for a biological treatment (Harmsen et al, 1997). In the present work, CWAO was applied to the lignin obtained from sugar-cane bagasse by the Organosolv acid process.…”

Section: Introductionmentioning

confidence: 99%

Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production

Sales

Abreu

Pereira

2004

Braz. J. Chem. Eng.

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-In the present work a process of catalytic wet air oxidation of lignin obtained from sugar-cane bagasse is developed with the objective of producing vanillin, syringaldehyde and p-hydroxybenzaldehyde in a continuous regime. Palladium supported on -alumina was used as the catalyst. The reactions in the lignin degradation and aldehyde production were described by a kinetic model as a system of complex parallel and series reactions, in which pseudo-first-order steps are found. For the purpose of producing aromatic aldehydes in continuous regime, a three-phase fluidized reactor was built, and it was operated using atmospheric air as the oxidizer. The best yield in aromatic aldehydes was of 12%. The experimental results were compatible with those values obtained by the pseudo-heterogeneous axial dispersion model (PHADM) applied to the liquid phase.

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“…It is also a stable intermediate from the decomposition of many organic pollutants (Chou et al, 1998;Davis et al, 1999;Hwang et al, 1999;Dinsdale et al, 2000), which is difficult to oxidize further (Ogata et al, 1981;Harmsen et al, 1997). For this reason, formic acid is often used as a model organic pollutant in wastewater treatment studies (Kawaguchi et al, 1993;Kim et al, 1996;Butterfield et al, 1997;Candal et al, 1997;Miller et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Catalytic wet peroxide oxidation of formic acid in wastewater with naturally-occurring iron ore

Erasmus¹,

Claassen²,

Westhuizen³

2016

WSA

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The catalytic wet oxidation of formic acid, using hydrogen peroxide as the oxidizing agent over naturally-occurring iron ore, was explored. Firstly, the decomposition of hydrogen peroxide to its hydroxyl radicals (HO • and HOO • ) over naturally-occurring iron ore was investigated. The reaction was monitored by ATR FTIR by following the disappearance of the O-H peak of H 2 O 2 at 2 860 cm -1 . Decomposition occurred according to the Fenton mechanism and resulted in observed first-order rate constants one order of magnitude faster than that without the catalyst. Turnover frequencies (TOF) of 1.97-8.85 x 10 -9 s -1 were obtained for the decomposition of H 2 O 2 . The wet oxidation of formic acid using hydrogen peroxide as the oxidizing agent over naturally-occurring iron ore reaction was also monitored by ATR FTIR, following the disappearance of the carbonyl stretching frequency of formic acid at 1 727 cm -1 . Experiments were performed at different hydrogen peroxide (2, 4, 6 and 8M) and formic acid (1.26, 2.52, 6.3 and 12.6 M) concentrations as well as with varying amounts of naturally-occurring iron ore catalyst, at pH = 2. Elevated hydrogen peroxide and formic acid concentrations led to increased observed first-order kinetics, as high as k obs = 21.75 x 10 -4 min -1 with a TOF = 1.73 x 10 -8 -1.12 x 10 -6 s -1 .

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Kinetic modeling for wet air oxidation of formic acid on a carbon supported platinum catalyst

Cited by 36 publications

References 15 publications

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production

Catalytic wet peroxide oxidation of formic acid in wastewater with naturally-occurring iron ore

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