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Treatment of olive oil mill wastewater by catalytic wet air oxidation: 3. Stability of supported ruthenium catalysts during oxidation of model pollutant p-hydroxybenzoic acid in batch and continuous reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
48572 46513 2007 7 PDF Available
Title
Treatment of olive oil mill wastewater by catalytic wet air oxidation: 3. Stability of supported ruthenium catalysts during oxidation of model pollutant p-hydroxybenzoic acid in batch and continuous reactors
Abstract

Catalytic wet air oxidation of an aqueous solution of p-hydroxybenzoic acid chosen as a representative phenolic pollutant of olive mill wastewater was conducted over ruthenium catalysts supported on TiO2 or ZrO2 in a stirred batch autoclave and in a fixed bed reactor at 140 °C and 50 bar air. The objective was to examine the stability of these catalysts by conducting catalyst recycling experiments in batch reactor and long-term stability tests in trickle-bed reactor. A small deactivation was observed during the first recycling of ruthenium catalyst in batch experiments, which was totally reversible after catalyst reduction. A small deactivation was also observed at the start of the continuous runs. This moderate deactivation was attributed to an over-oxidation of the surface or subsurface of ruthenium particles. Then the catalysts proved to be very stable in ca. 50-day continuous runs. Noticeably, no leaching from the catalysts was observed at all under these operating conditions. Catalysts prepared on ZrO2 from ruthenium nitrosyl nitrate showed the highest performances.

Keywords
Wet air oxidation; p-Hydroxybenzoic acid; Ruthenium catalysts; Stability; Batch reactor; Trickle-bed reactor
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Treatment of olive oil mill wastewater by catalytic wet air oxidation: 3. Stability of supported ruthenium catalysts during oxidation of model pollutant p-hydroxybenzoic acid in batch and continuous reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 75, Issues 1–2, 29 August 2007, Pages 71–77
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us