Iron type catalysts for the ozonation of oxalic acid in water

Catalytic Ozonation of Oxalate with a Cerium Supported Palladium Oxide: An Efficient Degradation Not Relying on Hydroxyl Radical Oxidation

“…MnO 2 , Fe 2 O 3 , Co 3 O 4 , and NiO had been found effective in the catalytic ozonation of oxalic acid but the removal rates at normal pHs in a reasonable reaction time were too low and the ozone doses were too high for practical uses. 5,7,11,12 There are still no data on ozone consumption for oxalate degradation which is critical to evaluate the catalysis efficiency. No evidence shows active sites and active oxidant species that are responsible for oxalate degradation, the information ABSTRACT: The cerium supported palladium oxide (PdO/ CeO 2 ) at a low palladium loading was found very effective in catalytic ozonation of oxalate, a probe compound that is difficult to be efficiently degraded in water with hydroxyl radical oxidation and one of the major byproducts in ozonation of organic matter.…”

“…It was reported that effective catalytic oxalate degradation with several typical metal oxides were achieved only at much lower pHs (e.g., 4.1 and 3.2 for MnO 2 , 2.5 for Fe 2 O 3 and Co 2 O 3 , and 2.4 for NiO) and continuous ozone introduction during the reaction over 30 min. 5,7,11,12 This binary oxide seems to be more efficient for practical catalytic ozonation reaction.…”

The Application and Reaction Mechanism of Catalytic Ozonation in Water Treatment

“…According to the different catalysts, catalytic ozonation can be divided to two kinds: one is the homogeneous catalytic ozonation, which is the metal ions as the catalysts present in the reaction system; the other is heterogeneous catalytic ozonation, the main catalysts are metal oxide and metal or metal oxide on supports. ) are usually used as the catalysts in homogeneous catalytic procedure, to degrade the organic pollutants in water [60][61][62][63][64][65]. During this procedure, metal ions decide the rate of reaction system, the selectivity of ozone oxidation system, and the efficiency of ozone utilization.…”

“…Now, the catalysts studied by researcher widely are metal oxides, and metals or metal oxides on supports. [72,73], ZnO [41,74], and FeOOH [75,76] show excellent catalytic activity as the heterogeneous catalysts in degrading the organic pollutants in aqueous solution.…”

“…The structure and dispersion of the catalysts are affected by the preparation method, so good catalyst preparation process can significantly improve the catalytic activity. Currently, the supports for heterogeneous system are including Al 2 O 3 , TiO 2 , active carbon, and clay; the active components are Fe, Co, Mn, Cu, Ni and so on [35,37,44,[77][78][79][80][81][82][83][84][85][86]. The results show that the supported catalysts give excellent activity during the ozone decomposition.…”