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Yadav A, Verma N. Carbon bead-supported copper-dispersed carbon nanofibers: An efficient catalyst for wet air oxidation of industrial wastewater in a recycle flow reactor. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.07.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schimming SM, LaMont OD, König M, Rogers AK, D'Amico AD, Yung MM, Sievers C. Hydrodeoxygenation of Guaiacol over Ceria-Zirconia Catalysts. CHEMSUSCHEM 2015; 8:2073-2083. [PMID: 26036450 DOI: 10.1002/cssc.201500317] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Indexed: 06/04/2023]
Abstract
The hydrodeoxygenation of guaiacol is investigated over bulk ceria and ceria-zirconia catalysts with different elemental compositions. The reactions are performed in a flow reactor at 1 atm and 275-400 °C. The primary products are phenol and catechol, whereas cresol and benzene are formed as secondary products. No products with hydrogenated rings are formed. The highest conversion of guaiacol is achieved over a catalyst containing 60 mol % CeO2 and 40 mol % ZrO2 . Pseudo-first-order activation energies of 97-114 kJ mol(-1) are observed over the mixed metal oxide catalysts. None of the catalysts show significant deactivation during 72 h on stream. The important physicochemical properties of the catalysts are characterized by X-ray diffraction (XRD), temperature-programmed reduction, titration of oxygen vacancies, and temperature-programmed desorption of ammonia. On the basis of these experimental results, the reasons for the observed reactivity trends are identified.
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Affiliation(s)
- Sarah M Schimming
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA)
- Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, GA, 30332 (USA)
| | - Onaje D LaMont
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA)
- Micromeritics Instrument Corporation, Norcross, GA, 30093 (USA)
| | - Michael König
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA)
- Technische Universität München, Catalysis Research Center, 85748 Garching (Germany)
| | - Allyson K Rogers
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA)
- National Renewable Energy Laboratory, Golden, CO 80401 (USA)
| | | | - Matthew M Yung
- National Renewable Energy Laboratory, Golden, CO 80401 (USA)
| | - Carsten Sievers
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., NW, Atlanta, GA, 30332 (USA).
- Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, GA, 30332 (USA).
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Kim KH, Ihm SK. Heterogeneous catalytic wet air oxidation of refractory organic pollutants in industrial wastewaters: a review. JOURNAL OF HAZARDOUS MATERIALS 2011; 186:16-34. [PMID: 21122984 DOI: 10.1016/j.jhazmat.2010.11.011] [Citation(s) in RCA: 227] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 10/27/2010] [Accepted: 11/04/2010] [Indexed: 05/30/2023]
Abstract
Catalytic wet air oxidation (CWAO) is one of the most economical and environmental-friendly advanced oxidation process. It makes a promising technology for the treatment of refractory organic pollutants in industrial wastewaters. Various heterogeneous catalysts including noble metals and metal oxides have been extensively studied to enhance the efficiency of CWAO. The present review is concerned about the literatures published in this regard. Phenolics, carboxylic acids, and nitrogen-containing compounds were taken as model pollutants in most cases, and noble metals such as Ru, Rh, Pd, Ir, and Pt as well as oxides of Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, and Ce were applied as heterogeneous catalysts. Reports on their characterization and catalytic performances for the CWAO of aqueous pollutants are reviewed. Discussions are also made on the reaction mechanisms and kinetics proposed for heterogeneous CWAO and also on the typical catalyst deactivations in heterogeneous CWAO, i.e. carbonaceous deposits and metal leaching.
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Affiliation(s)
- Kyoung-Hun Kim
- Department of Chemical and Biomolecular Engineering (BK21 program), KAIST, Yuseong-gu, Daejeon, Republic of Korea
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Keav S, Barbier J, Duprez D. Deactivation and regeneration of wet air oxidation catalysts. Catal Sci Technol 2011. [DOI: 10.1039/c0cy00085j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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