title: Composites of manganese oxide with carbon materials as catalysts for the ozonation of oxalic acid.
abstract: Manganese oxide and manganese oxide-carbon composites were prepared and tested as catalysts for the removal of oxalic acid by ozonation. Their performances were compared with the parent carbon material (activated carbon or carbon xerogel) used to prepare the composites. Oxalic acid degradation by carbon materials is slower than that attained with manganese oxide or manganese oxide-carbon composites. A complete degradation after 90 and 45 min of reaction was obtained for carbon materials and for the catalysts containing manganese, respectively. The ozonation in the presence of the prepared composites are supposed to occur mainly by surface reactions, following a direct oxidation mechanism by molecular ozone and/or surface oxygenated radicals.
authors.affiliation: LCM - Laboratory of Catalysis and Materials - Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. carla.orge@fe.up.pt
authors.forename: C A
authors.initials: CA
authors.lastname: Orge
authors.forename: J J M
authors.initials: JJ
authors.lastname: Órfão
authors.forename: M F R
authors.initials: MF
authors.lastname: Pereira
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D003460:Crystallization; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D019815:Oxalic Acid / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D010126:Ozone; D002244:Carbon; D019815:Oxalic Acid