Abstract
Removal of phenol by wet air oxidation was conducted with 1 wt.% Pt/Al 2O 3 and 1 wt.% Pt/CeO 2 catalysts. During the reaction carbonaceous materials were formed and deposited on the catalyst surface, and the materials deactivated the catalysts. XPS analysis showed that the carbonaceous materials on the Pt/Al 2O 3 catalyst were composed of four different morphologies. As the wet oxidation proceeded, C 2 type and C 3 type carbonaceous materials transformed into C 4 material. In the Pt/CeO 2 catalysts, however, C 4 material was not formed through the reaction. The broad profiles of CO 2 formation from TPO experiment implied that there were at least two types of carbon deposits burning at different temperatures; one on Pt particles, the other Al 2O 3 and CeO 2. The primarily formed carbonaceous deposit on Pt particles migrated continuously onto the supports.
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