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Catalytic wet air oxidation of aqueous solution of 2-chlorophenol over Ru/zirconia catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
48989 46536 2007 9 PDF Available
Title
Catalytic wet air oxidation of aqueous solution of 2-chlorophenol over Ru/zirconia catalysts
Abstract

Ru loaded zirconia catalysts (Ru/ZrO2) were found to be active in the catalytic wet air oxidation (CWAO) of 2-chlorophenol (2-CP) at relatively mild temperature. To optimize the reaction conditions, the effects of different operating parameters, such as the rotation speed, the reaction temperature, the total pressure, the initial concentration and the pH of the initial 2-CP solution on the catalytic activity of 3 wt.% Ru/ZrO2 were evaluated. The activation energy for the CWAO of 2-CP over Ru/ZrO2 was calculated to be 36 kJ mol−1. The 2-CP removal rate is zero order with respect to the initial 2-CP concentration. The CWAO of 2-CP changes from first order (oxygen diffusion control) to zero order (kinetic control) with respect to the oxygen partial pressure when the total pressure is higher than 4 MPa. The conversion of 2-CP increases with the pH of the initial 2-CP solution. The dechlorination reaction is promoted at higher pH. However, too high pH limits the total mineralization of 2-CP because the adsorption of the reaction intermediates is hindered. It was also confirmed that Ru(NO)(NO3)3 is better than RuCl3 to act as a ruthenium precursor.

Keywords
Catalytic wet air oxidation (CWAO); Chlorophenol; Ru; Zirconia
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Catalytic wet air oxidation of aqueous solution of 2-chlorophenol over Ru/zirconia catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 3–4, 15 February 2007, Pages 262–270
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Any Questions? feel free to contact us