scholarly journals Catalytic Wet Air Oxidation Using Supported Pt and Ru Catalysts for Treatment of Distillery Wastewater (Cognac and Sugarcane Vinasses)

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3974
Author(s):  
Thu ◽  
Besson
Keyword(s):  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Batch Mode ◽  
Ru Catalysts ◽  
Toc Removal ◽  
Distillery Wastewater ◽  
High Pollution ◽  
Dark Color ◽  
Continuous Oxidation

The production of brandy from wine and bioethanol from sugarcane in distilleries generates vinasses, which are effluents that are rich in organic matter. Since they have a high pollution load characterized by high chemical and biological oxygen demands and a dark color, the depollution of these effluents is inevitable. Pt and Ru catalysts supported on titania and zirconia were explored in the catalytic wet air oxidation (CWAO) processing of cognac and sugarcane wastewaters, in batch mode and in a trickle-bed reactor, at a temperature condition of 190 °C and a pressure condition of 70 bar air. The addition of a catalyst promoted total organic carbon (TOC) abatement and the oxidation of ammonium ions formed from organic nitrogen in the effluents to dinitrogen or nitrates. The best results in terms of selectivity to N2 were obtained by using Pt catalysts; a selectivity of 92% to N2 and a TOC removal of 90% were observed in continuous oxidation of the sugarcane vinasse.

Al2O3 supported Ru catalysts prepared by thermolysis of Ru3(CO)12 for catalytic wet air oxidation

2011 ◽  
Vol 257 (17) ◽  
pp. 7727-7731 ◽  
Author(s):  
Chaoying Yu ◽  
Peiqing Zhao ◽  
Gexin Chen ◽  
Bin Hu
Keyword(s):  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Ru Catalysts

Treatment Of Distillery Wastewater Using Catalytic Wet Air Oxidation

2011 ◽  
Vol 6 (2) ◽  
pp. 36-44 ◽  
Author(s):  
S. Suresh ◽  
◽  
Ravi Shankar ◽  
Shri Chand ◽  
◽  
...  
Keyword(s):  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Distillery Wastewater

Influence of Ru precursors on the activity of Ru/Al2O3–TiO2 catalysts for catalytic wet air oxidation of high concentration organic compounds

RSC Advances ◽  
2016 ◽  
Vol 6 (77) ◽  
pp. 73810-73816 ◽  
Author(s):  
Fagui Lu ◽  
Chaoying Yu ◽  
Xu Meng ◽  
Jinqi Zhang ◽  
Gexin Chen ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
High Concentration ◽  
Ru Catalysts

The nature of the Ru precursors affected the performance of Ru catalysts with those prepared from chloride-free Ru precursors being more active than those prepared from chlorine-containing Ru precursors.

scholarly journals Heteroatom (N, S) Co-Doped CNTs in the Phenol Oxidation by Catalytic Wet Air Oxidation

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 578
Author(s):  
Raquel P. Rocha ◽  
Olívia Salomé G. P. Soares ◽  
José J. M. Órfão ◽  
Manuel Fernando R. Pereira ◽  
José L. Figueiredo
Keyword(s):  
Catalytic Activity ◽  
Phenol Degradation ◽  
Textural Properties ◽  
Inert Atmosphere ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Batch Mode ◽  
Co Doping ◽  
Thermally Treated

The N, S-co-doping of commercial carbon nanotubes (CNTs) was performed by a solvent-free mechanothermal approach using thiourea. CNTs were mixed with the N, S-dual precursor in a ball-milling apparatus, and further thermally treated under inert atmosphere between 600 and 1000 °C. The influence of the temperature applied during the thermal procedure was investigated. Textural properties of the materials were not significantly affected either by the mechanical step or by the heating phase. Concerning surface chemistry, the developed methodology allowed the incorporation of N (up to 1.43%) and S (up to 1.3%), distributed by pyridinic (N6), pyrrolic (N5), and quaternary N (NQ) groups, and C–S–, C–S–O, and sulphate functionalities. Catalytic activities of the N, S-doped CNTs were evaluated for the catalytic wet air oxidation (CWAO) of phenol in a batch mode. Although the samples revealed a similar catalytic activity for phenol degradation, a higher total organic carbon removal (60%) was observed using the sample thermally treated at 900 °C. The improved catalytic activity of this sample was attributed to the presence of N6, NQ, and thiophenic groups. This sample was further tested in the oxidation of phenol under a continuous mode, at around 30% of conversion being achieved in the steady-state.

Wet Air Oxidation of Phenol over Ru Based Catalysts – Effects of Support

2010 ◽  
Vol 1279 ◽  
Author(s):  
A. E. Espinosa des Los Monteros ◽  
G. Lafaye ◽  
G. Torres ◽  
J. Barbier
Keyword(s):  
Ruthenium Catalysts ◽  
Industrial Processes ◽  
Catalytic Wet Air Oxidation ◽  
Doped Ceria ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Toc Removal ◽  
Highly Active ◽  
Elementary Analysis ◽  
Icp Analysis

AbstractCatalytic wet air oxidation (CWAO) of aqueous solutions of phenol was performed on ruthenium catalysts supported on different oxides: TiO2, ZrO2 and their doped ceria mixtures. Phenol was chosen as a model pollutant molecule because of its wide use in industrial processes. All the samples were found to be highly active for phenol oxidation and the various titania-ceria mixtures were the most efficient for total organic carbon (TOC) removal. ICP analysis of the remaining solution after reaction revealed that ruthenium has not leached. Moreover, elementary analysis of the used catalysts showed that the deposition of carbonaceous species on the surface of the catalysts was rather low and was dependent on the nature of the support.

Catalytic wet air oxidation of p-nitrophenol (PNP) aqueous solution using multi-component heterogeneous catalysts

2001 ◽  
Vol 43 (2) ◽  
pp. 229-236 ◽  
Author(s):  
C.-H. Yoon ◽  
S.-H. Cho ◽  
S.-H. Kim ◽  
S.-R. Ha
Keyword(s):  
Aqueous Solution ◽  
Heterogeneous Catalysts ◽  
Batch Reactor ◽  
High Strength ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Toc Removal ◽  
Study Results ◽  
C 30

This study investigated the decomposition of high strength p-nitrophenol (PNP) of 2,000 mg/l (3,400 mg of COD/1,250 mg of TOC) by catalytic wet air oxidation. Multi-component heterogeneous catalysts were used as catalysts for this purpose. The study results using a batch reactor showed that catalyst “D” (Mn-Ce-Zr 22.4 g plus CuSO4 1.0 g; Mn-Ce-Zr-Cu [CuSO4]) was more effective (56˜74%) than catalyst “A” (Mn-Ce-Zr 22.4 g) under the given conditions (O2 partial pressure of 1.0 MPa; temperature of 170˜190°C; 30 min of reaction time). The best result was obtained when 2 g of Mn-Ce-Zr-Cu [CuSO4] was used per 1L of PNP aqueous solution. COD and TOC removal efficiencies were 18% and 23% without catalysts during 20 min of reaction at 190°C. They were improved to 79% and 71% with 2 g/L of Mn-Ce-Zr-Cu [CuSO4] under the same conditions. The ratio of BOD5/COD was measured to evaluate biodegradability. It was 0.05 without catalyst and increased to 0.33 with 2 g/L of Mn-Ce-Zr-Cu [CuSO4] for 20 min of reaction.

Catalytic wet air oxidation of aqueous solution of phenol in a fixed bed reactor over Ru catalysts supported on ceria promoted MCM-41

RSC Advances ◽  
2016 ◽  
Vol 6 (115) ◽  
pp. 114383-114395 ◽  
Author(s):  
Dilip Kumar Mondal ◽  
Chandona Mondal ◽  
Shyamal Roy
Keyword(s):  
Aqueous Solution ◽  
Noble Metal ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Ru Catalysts ◽  
Mcm 41

Catalytic wet air oxidation (CWAO) of phenol was carried out in a fixed bed reactor over a noble metal (Ru) supported on silica MCM-41 material.

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