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Rocha RP, Pereira MFR, Figueiredo JL. Metal-free carbon materials as catalysts for wet air oxidation. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.04.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Song M, Wang Y, Guo Y, Wang L, Zhan W, Guo Y, Lu G. Catalytic wet oxidation of aniline over Ru catalysts supported on a modified TiO 2. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62848-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ovejero G, Rodríguez A, Vallet A, García J. Ni/Fe-supported over hydrotalcites precursors as catalysts for clean and selective oxidation of Basic Yellow 11: reaction intermediates determination. CHEMOSPHERE 2013; 90:1379-1386. [PMID: 22960061 DOI: 10.1016/j.chemosphere.2012.07.067] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 07/30/2012] [Accepted: 07/31/2012] [Indexed: 06/01/2023]
Abstract
In this work, Basic Yellow 11 (BY 11) was employed as model compound to study catalytic wet air oxidation as a pre-treatment step to the conventional biological oxidation. Ni and Fe catalysts supported over hydrotalcite (HT) were prepared by incipient wetness and excess impregnation to obtain catalysts with different metal loadings (from 1 to 10 wt.%). HTs were synthesized by co-precipitation and characterized with XRD, X-ray fluorescence (XRF), BET, thermogravimetric analysis and SEM. Results showed that dye conversion increased with Ni and Fe content up to 7 wt.% and that the most effective catalyst were prepared by incipient wetness impregnation. The influence of metal loading in the catalyst, and the preparation method as well as the reaction conditions was investigated. A mechanism and reaction pathways for BY 11 during catalytic liquid phase oxidation have also been proposed.
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Affiliation(s)
- G Ovejero
- Grupo de Catálisis y Procesos de Separación, Departamento de Ingeniería Química, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain.
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Ovejero G, Rodríguez A, Vallet A, García J. Intermediary Products in the Catalytic Wet Air Oxidation of Crystal Violet with Ni/MgAlO as Catalyst. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301533s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gabriel Ovejero
- Grupo de Catálisis y Procesos de Separación
(CyPS), Departamento de Ingeniería Química, Facultad
de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Araceli Rodríguez
- Grupo de Catálisis y Procesos de Separación
(CyPS), Departamento de Ingeniería Química, Facultad
de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Ana Vallet
- Grupo de Catálisis y Procesos de Separación
(CyPS), Departamento de Ingeniería Química, Facultad
de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Juan García
- Grupo de Catálisis y Procesos de Separación
(CyPS), Departamento de Ingeniería Química, Facultad
de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
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Anotai J, Panchanawaporn N, Boonrattanakij N, Lu MC. Verification of competitive kinetics technique and oxidation kinetics of 2,6-dimethyl-aniline and o-toluidine by Fenton process. JOURNAL OF HAZARDOUS MATERIALS 2011; 188:269-273. [PMID: 21320752 DOI: 10.1016/j.jhazmat.2011.01.098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Accepted: 01/25/2011] [Indexed: 05/30/2023]
Abstract
The competitive kinetics technique is shown to be a useful and reliable tool for determining rate constants. Regardless of the conditions of the reaction and the operation mode, the intrinsic second-order rate constants of 2,6-dimethyl-aniline and hydroxyl radicals were 1.65 × 10(10), 1.60 × 10(10), and 1.71 × 10(10)M(-1)s(-1) in the absence of SiO(2) under complete-mix conditions, in the presence of SiO(2) under complete-mix conditions, and in a fluidized-bed Fenton reactor with SiO(2) as the media, respectively, demonstrating that the rates are comparable under a variety of reaction conditions. The average intrinsic second-order rate constant of o-toluidine and hydroxyl radicals obtained in a homogeneous system under various conditions was 7.36 × 10(9)M(-1)s(-1), indicating that o-toluidine is less susceptible to hydroxyl radicals than 2,6-dimethyl-anilne. Hydroxyl radicals primarily attacked the amine group rather than the methyl group of the o-toluidine to form o-cresol and 2-nitrotoluene, which sequentially transformed to carboxylic acids including acetic, oxalic, lactic, and maleic acids after the collapse of the benzene ring.
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Affiliation(s)
- Jin Anotai
- Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, National Center of Excellence for Environmental and Hazardous Waste Management, Pracha-u-tid Road, Bangmod, Thungkru, Bangkok 10140, Thailand.
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Besson M, Descorme C, Bernardi M, Gallezot P, di Gregorio F, Grosjean N, Minh DP, Pintar A. Supported noble metal catalysts in the catalytic wet air oxidation of industrial wastewaters and sewage sludges. ENVIRONMENTAL TECHNOLOGY 2010; 31:1441-1447. [PMID: 21214003 DOI: 10.1080/09593331003628065] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This paper reviews some catalytic wet air oxidation (CWAO) investigations of industrial wastewaters over platinum and ruthenium catalysts supported on TiO2 and ZrO2 formulated to be active and resistant to leaching, with particular focus on the stability of the catalyst. Catalyst recycling experiments were performed in batch reactors and long-term stability tests were conducted in trickle-bed reactors. The catalyst did not leach upon treatment of Kraft bleaching plant and olive oil mill effluents, and could be either recycled or used for long periods of time in continuous reactors. Conversely, these catalysts were rapidly leached when used to treat effluents from the production of polymeric membranes containing N,N-dimethylformamide. The intermediate formation of amines, such as dimethylamine and methylamine with a high complexing capacity for the metal, was shown to be responsible for the metal leaching. These heterogeneous catalysts also deactivated upon CWAO of sewage sludges due to the adsorption of the solid organic matter. Pre-sonication of the sludge to disintegrate the flocs and improve solubility was inefficient.
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Affiliation(s)
- M Besson
- Institut de recherches sur la catalyse et l'environnement de Lyon-IRCELYON, UMR5256 CNRS-Université Lyon 1, 2 Avenue Albert Einstein 69626 Villeurbanne, France.
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Boonrattanakij N, Lu MC, Anotai J. Kinetics and mechanism of 2,6-dimethyl-aniline degradation by hydroxyl radicals. JOURNAL OF HAZARDOUS MATERIALS 2009; 172:952-957. [PMID: 19692169 DOI: 10.1016/j.jhazmat.2009.07.079] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2009] [Revised: 07/20/2009] [Accepted: 07/21/2009] [Indexed: 05/28/2023]
Abstract
This research investigated the intrinsic second-order rate constant between 2,6-dimethyl-aniline (2,6-DMA) and hydroxyl radicals (OH) using Fenton's reactions under both batch and continuous operations. The competitive kinetics technique with aniline as a reference compound was employed. In the batch study under various conditions, the second-order rate constants of 2,6-DMA with OH were between 1.59 x 10(10) and 1.80 x 10(10)M(-1)s(-1) with a mean of 1.71 x 10(10)M(-1)s(-1) which equals the average value obtained from the continuous study as well. The concentrations of OH at the steady state under the continuous mode were estimated to be between 4.85 x 10(-10) and 6.82 x 10(-10)mM. 2,6-dimethyl-nitrobenzene, 2,6-dimethyl-phenol, 2,6-dimethyl-nitrophenol, 2,6-dimethyl-hydroquinone, 2,6-dimethyl-p-benzoquinone, and 2,6-dimethyl-3-hydroxy-p-benzoquinone were identified as the aromatic by-products indicating that the methyl group on the aromatic ring was not susceptible to OH attack. Maleic, lactic, oxalic, acetic, and formic acids were found as generated carboxylic acids. An oxidation pathway of 2,6-DMA by OH is also proposed.
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Affiliation(s)
- Nonglak Boonrattanakij
- International Postgraduate Programs in Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand
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Castillejos-López E, Maroto-Valiente A, Nevskaia D, Muñoz V, Rodríguez-Ramos I, Guerrero-Ruiz A. Comparative study of support effects in ruthenium catalysts applied for wet air oxidation of aromatic compounds. Catal Today 2009. [DOI: 10.1016/j.cattod.2008.09.033] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Gomes HT, Machado BF, Ribeiro A, Moreira I, Rosário M, Silva AMT, Figueiredo JL, Faria JL. Catalytic properties of carbon materials for wet oxidation of aniline. JOURNAL OF HAZARDOUS MATERIALS 2008; 159:420-426. [PMID: 18394796 DOI: 10.1016/j.jhazmat.2008.02.070] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Revised: 02/10/2008] [Accepted: 02/12/2008] [Indexed: 05/26/2023]
Abstract
A mesoporous carbon xerogel with a significant amount of oxygen functional groups and a commercial activated carbon, were tested in the catalytic wet air oxidation of aniline at 200 degrees C and 6.9 bar of oxygen partial pressure. Both carbon materials showed high activity in aniline and total organic carbon removal, a clear increase in the removal efficiency relatively to non-catalytic wet air oxidation being observed. The best results in terms of aniline removal were obtained with carbon xerogel, an almost complete aniline conversion after 1h oxidation with high selectivity to non-organic compounds being achieved. The materials were characterized by thermogravimetric analysis, temperature programmed desorption, N(2) adsorption and scanning electron microscopy, in order to relate their performances to the chemical and textural characteristics. It was concluded that the removal efficiency, attributed to both adsorption and catalytic activity, is related to the mesoporous character of the materials and to the presence of specific oxygen containing functional groups at their surface. The effect of catalytic activity was found to be more important in the removal of aniline than the effect of adsorption at the materials surface. The results obtained indicate that mesoporous carbon xerogels are promising catalysts for CWAO processes.
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Affiliation(s)
- Helder T Gomes
- Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
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Levi R, Milman M, Landau MV, Brenner A, Herskowitz M. Catalytic wet air oxidation of aniline with nanocasted Mn-Ce-oxide catalyst. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2008; 42:5165-5170. [PMID: 18754364 DOI: 10.1021/es703070h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The catalytic wet air oxidation of aqueous solution containing 1000 ppm aniline was conducted in a trickle-bed reactor packed with a novel nanocasted Mn-Ce-oxide catalyst (surface area of 300 m2/g) prepared using SBA-15 silica as a hard template. A range of liquid hourly space velocities (5-20 h(-1)) and temperatures (110-140 degrees C) at 10 bar of oxygen were tested. The experiments were conducted to provide the intrinsic performance of the catalysts. Complete aniline conversion, 90% TOC conversion, and 80% nitrogen mineralization were achieved at 140 degrees C and 5 h(-1). Blank experiments yielded relatively low homogeneous aniline (<35%) and negligible TOC conversions. Fast deactivation of the catalysts was experienced due to leaching caused by complexation with aniline. Acidification of the solution with HCI (molar HCI to aniline ratio of 1.2) was necessary to avoid colloidization and leaching of the nanoparticulate catalyst components. The catalyst displayed stable performance for over 200 h on stream.
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Affiliation(s)
- R Levi
- Chemical Engineering Department, Blechner Center for Industrial Catalysis and Process Development, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
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Garcia J, Gomes H, Serp P, Kalck P, Figueiredo J, Faria J. Platinum catalysts supported on MWNT for catalytic wet air oxidation of nitrogen containing compounds. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.02.013] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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