Catalytic wet air oxidation of carboxylic acids at atmospheric pressure

Catalytic wet oxidation of the sodium salts of citric, lactic, malic and tartaric acids in highly alkaline, high ionic strength solution

“…The negative activity observed for nickel(III) and iron(III) oxides, which are both extremely insoluble in highly alkaline solution, was most likely due to these compounds scavenging free radical intermediates and therefore hindering auto-oxidation, and therefore overall oxidation. This has been reported by Lee and Kim [19] to occur during CWO of maleic acid in the presence of alumina. The same main reaction products (sodium formate, sodium acetate, sodium oxalate and sodium carbonate) were identified in CWO tests using each of the different transition metal oxides (table 2) and in the uncatalysed system.…”

Wet Oxidation of Formaldehyde with Heterogeneous Catalytic Materials

“…Fig . 12 compares the reaction concentrations for both types of catalysts; it is clear that formaldehyde elimination occurs at faster and greater proportion when testing the Pt-based catalyst, due to the increased activity exhibited by the noble metal, which is in agreement with the results reported here and those reported by other authors [7], [9]. For both reaction tests, the oxalic acid concentration is similar, but that of the acetic acid changes significantly, having a lower formation percentage with the Ce-Mn system.…”

“…The values obtained for surface area of the Ce-Mn mixed oxides were 85-130 m 2 g -1 , which are within the order of magnitude reported in the literature [4]- [6]. However, for the system Pt/Al 2 O 3 , low surface area (28.55 m 2 g -1 ) values were obtained due to the low surface area of the commercial support (-alumina) [7]- [9]. Fig.…”

Tuning CNT Properties for Metal-Free Environmental Catalytic Applications

“…Oxalic acid and phenol are commonly selected as probe species, since they represent well a refractory short chain carboxylic acid end-product in AOPs (in the case of oxalic acid) [62][63][64] and a more complex molecule which is also an organic pollutant commonly found in industrial effluents (phenol) [38]. In some COZ cases, authors also studied antibiotics (as erythromycin [65] and sulfamethoxazole [66]), lipid regulators (as bezafribate) [67], and herbicides (as atrazine) [68,69].…”