Ultrasound assisted catalytic wet peroxide oxidation of phenol: kinetics and intraparticle diffusion effects.
The combination of ultrasound irradiation and catalytic wet peroxide oxidation was used as a means to degrade phenol. Direct and indirect irradiation were employed, while experiments in the absence of ultrasound were used as reference. A mixed (Al-Fe) pillared clay named FAZA, was used as a catalyst in the form of powder, extrudates and crushed extrudates. Ultrasound was found to clearly enhance the extrudates performance, increasing the conversion at 4h by more than 6 times under direct and almost 11 times under indirect irradiation. This observation is attributed to the reduction of diffusion resistance within the catalyst pores. The overall sonication-catalytic wet peroxide oxidation process appears very promising for environmental purposes.
Nikolopoulos
Apostolos N
AN
School of Chemical Engineering, National Technical University of Athens, Zografou Campus, Heroon Polytechniou Str. 9, Athens 15780, Greece. npap@chemeng.ntua.gr
Igglessi-Markopoulou
Olga
O
Papayannakos
Nikolaos
N
D000538:Aluminum Silicates / Q000737:chemistry*; D002384:Catalysis; D000077215:Clay; D003102:Colloids / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D004058:Diffusion; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010316:Particle Size; D019800:Phenol / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects*; D012996:Solutions; D013010:Sonication; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
D000538:Aluminum Silicates; D003102:Colloids; D012996:Solutions; D014874:Water Pollutants, Chemical; D019800:Phenol; D006861:Hydrogen Peroxide; D000077215:Clay