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Catalysts
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Catalytic Wet-Air Oxidation Processes
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Catalytic Wet-Air Oxidation Processes

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (31 May 2018) | Viewed by 10757

Special Issue Editors

Prof. Dr. Juan García Rodríguez

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Guest Editor
Univ Complutense Madrid, Fac. Ciencias Quim, Dept Ingn Quim, Grp Catalisis & Proc Separac CyPS, Avda Complutense S-N, E-28040 Madrid, Spain
Interests: adsorption processes; catalytic wet air oxidation; synthesis and characterization of carbon materials; wastewater treatments
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. José L. Figueiredo

E-Mail Website
Guest Editor
Associate Laboratory LSRE-LCM, Chemical Engineering Dept., Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Interests: heterogeneous catalysis; nanostructured carbon materials; chemical and catalytic reaction engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Rapid development of industrial processes generates a wide variety of wastewater, and its disposal has become a major environmental problem. Wet air oxidation (WAO) is an attractive technique for industrial wastewater treatment, involving the oxidation of organic matter at relatively high temperatures and pressures. In order to be able to employ milder operating conditions and to reduce the operating costs, catalytic wet air oxidation (CWAO) has been developed. The presence of a catalyst enhances the formation of highly reactive hydroxyl radicals and promotes the removal of reaction intermediate compounds. This Special Issue is focused on catalytic wet air oxidation processes as alternative treatment methods for aqueous pollutants. Original research papers and short reviews addressing the synthesis and characterization of new catalysts, the influence of the different operating parameters and reactor types, the reaction kinetics and mechanisms and identification of intermediates are invited for submission.

Prof. Dr. Juan García
Prof. Dr. José L. Figueiredo
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Catalytic wet air oxidation
  • Advanced oxidation processes
  • Wastewater treatment
  • Toxic-Refractory wastewaters
  • Noble metal catalysts
  • Carbon-based catalysts
  • Reaction kinetics and mechanisms
  • Identification of intermediates
  • Low cost catalysts
  • Pillared clays
  • Activity and stability of catalyst

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Published Papers (2 papers)

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Research

12 pages, 6692 KiB  
Article
The Role of Pulse Voltage Amplitude on Chemical Processes Induced by Streamer Discharge at Water Surface
by Ruma, Hamid Hosano, Takashi Sakugawa and Hidenori Akiyama
Catalysts 2018, 8(5), 213; https://doi.org/10.3390/catal8050213 - 17 May 2018
Cited by 21 | Viewed by 4787
Abstract
The paper reports the effects of pulse voltage amplitude on streamer discharge propagation at water surface. The subsequent chemical processes in a reactor following the surface discharges with different voltages are presented. A pulsed power modulator (PPM) system equipped with a control unit [...] Read more.
The paper reports the effects of pulse voltage amplitude on streamer discharge propagation at water surface. The subsequent chemical processes in a reactor following the surface discharges with different voltages are presented. A pulsed power modulator (PPM) system equipped with a control unit was employed to generate 0–25 kV pulses at 500 Hz. A point-plane electrode configuration was used for experiments, with the point electrode placed with 1 mm gap from the water surface in atmospheric air, and plane ground submerged with 30 mm gap in water. The streamer length at water surface was significantly influenced by the pulse voltage amplitude. Colorimetric measurement of hydrogen peroxide (H2O2) and treatment of indigo carmine organic dye solution were carried out to elucidate the chemical processes produced at various pulse voltages. The experimental results reveal that the applied voltage is a factor that greatly affects water surface discharges and their chemical processes. Full article
(This article belongs to the Special Issue Catalytic Wet-Air Oxidation Processes)
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8 pages, 1094 KiB  
Article
Catalytic Wet Oxidation of Pharmaceutical Sludge by Molecular Sieve Loaded with Cu/Ce
by Xu Zeng, Jun Liu and Jianfu Zhao
Catalysts 2018, 8(2), 67; https://doi.org/10.3390/catal8020067 - 8 Feb 2018
Cited by 12 | Viewed by 4397
Abstract
In the present study, the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce as catalyst was investigated. Experiments were performed in an experimental batch reactor. Reaction parameters including catalyst dose, temperature, time, and oxygen pressure were discussed. The results [...] Read more.
In the present study, the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce as catalyst was investigated. Experiments were performed in an experimental batch reactor. Reaction parameters including catalyst dose, temperature, time, and oxygen pressure were discussed. The results showed that the catalysts prepared by co-precipitating method have good catalytic performance. Under optimum conditions, the highest volatile suspended solids (VSS) removal rate approximately 92% and chemical oxygen demand (COD) removal rate of 75% were obtained at 260 °C for 60 min with initial oxygen pressure 1.0 MPa and the catalyst 10 g/L. These results implied that the catalytic wet oxidation of pharmaceutical sludge by molecular sieve loaded with Cu/Ce is a promising method for the highly efficient degradation of the sludge. Full article
(This article belongs to the Special Issue Catalytic Wet-Air Oxidation Processes)
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