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Ultrasound assisted catalytic wet peroxide oxidation of phenol: kinetics and intraparticle diffusion effects.

Nikolopoulos AN, Igglessi-Markopoulou O, Papayannakos N

School of Chemical Engineering, National Technical University of Athens, Zografou Campus, Heroon Polytechniou Str. 9, Athens 15780, Greece. npap@chemeng.ntua.gr

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.

Published 14 October 2005 in Ultrason Sonochem, 13(1): 92-7.
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