scholarly journals Performance of activated carbons in the catalytic wet peroxide oxidation (CWPO) of maleic acid

2013 ◽  
Vol 5 (6) ◽  
pp. 189-199
Author(s):  
Daniel Kaale
Keyword(s):  
Maleic Acid ◽  
Activated Carbons ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation

Factors influencing catalytic wet peroxide oxidation of maleic acid in aqueous phase over copper/micelle templated silica-3-aminopropyltrimethoxysilane catalyst

2009 ◽  
Vol 60 (10) ◽  
pp. 2621-2627
Author(s):  
Lilian Daniel ◽  
Jamidu H. Y. Katima
Keyword(s):  
Aqueous Phase ◽  
Maleic Acid ◽  
Atmospheric Pressure ◽  
Batch Reactor ◽  
Copper Catalyst ◽  
Catalyst Loading ◽  
Peroxide Oxidation ◽  
Feed Concentration ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation

Catalytic wet peroxide oxidation (CWPO) of initial maleic acid feed concentration (0.005 to 0.03 M) was carried out in a temperature range of 20–50°C, on micelle templated silica-3-aminopropyltrimethoxysilane (MTS-AMP) supported copper catalyst. The influence of various operating parameters such as initial feed concentration of maleic acid, temperature, catalyst loading and the stability of the catalyst were investigated. CWPO reactions were performed in a stirred batch reactor at an atmospheric pressure in the presence of H2O2 as an oxidant. Total conversion of maleic acid into acetic acid was obtained under mild conditions (i.e. atmospheric pressure and 40°C). Blank experiments showed no measurable maleic acid conversion (i.e. only ∼0.5% conversion of initial maleic acid), indicating that a significant oxidation reaction of maleic acid is enhanced by the presence of a catalyst. Copper on micelle templated silica-3-aminopropyltrimethoxysilane catalyst therefore was found to be suitable for aqueous phase oxidation of maleic acid with 100% of maleic acid conversion.

scholarly journals Screening of Activated Carbons for the Treatment of Highly Concentrated Phenol Solutions Using Catalytic Wet Peroxide Oxidation: The Effect of Iron Impurities on the Catalytic Activity

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1318
Author(s):  
Maria T. Pinho ◽  
Rui S. Ribeiro ◽  
Helder T. Gomes ◽  
Joaquim L. Faria ◽  
Adrián M. T. Silva
Keyword(s):  
Active Sites ◽  
Catalyst Deactivation ◽  
Activated Carbons ◽  
Inert Atmosphere ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Industrial Preparation ◽  
Iron Leaching ◽  
European Regulations ◽  
Catalytic Wet Peroxide Oxidation

Activated carbons (ACs) have been used as metal supports for catalytic wet peroxide oxidation (CWPO) of organic compounds. A shortcoming is that added metals can undergo leaching, leading to catalyst deactivation and secondary contamination of the treated water. In the present study, CWPO of phenol aqueous solutions was investigated in the presence of five commercial ACs without added metals yet containing different extents of iron impurities resulting from their industrial preparation procedures (ROX 0.8, RX 3-Extra, C-Gran and PK 0.25-1 from Cabot Norit and HYDRAFFIN AS 12/450 from Degussa). Application of as-received ROX 0.8 leads to the best compromise between removals of phenol (79%) and total organic carbon (TOC; 50%) and iron leaching (0.22 mg L−1). In-house-modified ROX 0.8 materials, obtained by thermal treatment under inert atmosphere followed by activation under oxidative atmosphere, were also tested. The activity of ROX 0.8 oxidized at 673 K (ROXN673) was the highest among these materials (92% and 57% of phenol and TOC removals, respectively) and with iron leaching (0.67 mg L−1) well below the limits established by European regulations for discharge of treated waters. This enhanced performance was mainly explained by the more developed porous structure and higher specific surface area (SBET) of ROXN673, thus promoting better accessibility to iron impurities, which act as active sites for CWPO at the surface of the catalyst.

scholarly journals Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

2010 ◽  
Vol 151 (1-2) ◽  
pp. 153-158 ◽  
Author(s):  
Helder T. Gomes ◽  
Sandra M. Miranda ◽  
Maria J. Sampaio ◽  
Adrián M.T. Silva ◽  
Joaquim L. Faria
Keyword(s):  
Sulphuric Acid ◽  
Activated Carbons ◽  
Acid Catalysts ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation

The role of activated carbons functionalized with thiol and sulfonic acid groups in catalytic wet peroxide oxidation

2011 ◽  
Vol 106 (3-4) ◽  
pp. 390-397 ◽  
Author(s):  
Helder T. Gomes ◽  
Sandra M. Miranda ◽  
Maria J. Sampaio ◽  
José L. Figueiredo ◽  
Adrián M.T. Silva ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Activated Carbons ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation ◽  
Sulfonic Acid Groups

scholarly journals Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40450-40460
Author(s):  
Carlos Andrés Vallejo ◽  
Luis Alejandro Galeano ◽  
Raquel Trujillano ◽  
Miguel Ángel Vicente ◽  
Antonio Gil
Keyword(s):  
Solvent Free ◽  
Peroxide Oxidation ◽  
Highly Active ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation ◽  
Hydrolysis Of ◽  
Clay Catalysts

Significantly intensified preparation of Al/Fe-hydrolysed-pillaring solutions and solvent-free intercalation of bentonites yielding Al/Fe-PILCs highly active in catalytic wet peroxide oxidation.

Surface modification of sewage sludge derived carbonaceous catalyst for m-cresol catalytic wet peroxide oxidation and degradation mechanism

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41867-41876 ◽  
Author(s):  
Yang Yu ◽  
Huangzhao Wei ◽  
Li Yu ◽  
Tong Zhang ◽  
Sen Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Sewage Sludge ◽  
Organic Synthesis ◽  
Degradation Mechanism ◽  
Peroxide Oxidation ◽  
Wet Peroxide Oxidation ◽  
Carbonaceous Catalyst ◽  
Catalytic Wet Peroxide Oxidation

Organic synthesis is used to investigate the degradation of m-cresol and the intermediates are identified by in situ NMR.

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