Wet Oxidation of Phenol Catalyzed by Unpromoted and Platinum-Promoted Manganese/Cerium Oxide

• Published in: Industrial & engineering chemistry research 1998-09, Vol.37 (9), p.3561-3566
• Main Authors: Hamoudi, Safia, Larachi, Faïçal, Cerrella, Graciela, Cassanello, Myrian
• Format: Article
• Language: English
• Subjects: Applied sciences; Catalysis; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; General purification processes; Pollution; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Wastewaters; Water treatment and pollution
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie980081w

Manganese/cerium composite oxide (MnO2/CeO2) proved to be a potent solid catalyst for the catalytic wet oxidation (CWO) of aqueous phenol under mild treatment conditions (80−130 °C, 0.5 MPa O2 pressure). Despite the fact this catalyst exhibited an important activity in eliminating completely phenol and total organic carbon (TOC), its poor selectivity to CO2 was demonstrated as a result of deposition on the catalyst surface of carbonaceous deposits with high carbon content. Promotion of MnO2/CeO2 with platinum improved the CO2 yield of phenol oxidation. Evidence for the reduction of the carbonaceous deposit over Pt−MnO2/CeO2 was confirmed via elemental analysis and temperature-programmed oxidation (TPO). Surface analysis by X-ray photoelectron spectroscopy (XPS) indicated that the deposits built up more on cerium than on manganese and that platinum increased the aromaticity of the deposit.