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Efficiency and reactivity pattern of ceria-based noble metal and transition metal-oxide catalysts in the wet air oxidation of phenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
46437 46439 2012 10 PDF Available
Title
Efficiency and reactivity pattern of ceria-based noble metal and transition metal-oxide catalysts in the wet air oxidation of phenol
Abstract

The activity-stability pattern of ceria-based noble metal (Pt/CeO2) and transition metal-oxide (MnCeOx) catalysts in the wet air oxidation of phenol (CWAO) at different catalyst-to-phenol weight ratio (R, 1–5) was comparatively probed using a stirred batch reactor with continuous oxygen feed (TR, 150 °C; PO2,PO2, 0.9 MPa). Both Pt/CeO2 and MnCeOx systems drive a surface dual-site Langmuir–Hinshelwood (L–H) reaction path enabling higher efficiency, different reaction kinetics and “phenol-total organic carbon” conversion relationships in comparison to homogeneous CWAO catalysts [1]. A simplified reaction scheme based on consecutive adsorption and mineralization steps and the relative kinetic analysis show that the former determines the rate of phenol and TOC removal, while the latter controls the selectivity and rate of catalyst fouling. The MnCeOx system ensures a fast and complete phenol conversion and a TOC removal higher than 80% at any R, while improved adsorption and mineralization functionalities explain a higher resistance to deactivation by fouling than Pt/CeO2 system.

Graphical abstractComparison of the CWAO pattern of the Pt/CeO2 and MnCeOx catalysts at 150 °C and various catalyst-to-phenol weight ratio (R) with that of homogeneous systems [1]: TOC vs. phenol conversion.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The activity pattern of Pt/CeO2 and MnCeOx systems in the phenol CWAO is addressed. ► Activity pattern is explained by a L–H path based on adsorption and oxidation steps. ► Homogeneous and heterogeneous CWAO processes show diverse phenol-TOC conversion relationships. ► Higher adsorption and oxidation rates explain the better activity of MnCeOx system.

Keywords
R, catalyst-to-phenol weight ratio; kPh, pseudo 1st-order kinetic constant of phenol concentration decay (h−1); kCO2kCO2, pseudo 1st-order kinetic constant of CO2 formation (h−1); ratePh, rate of phenol concentration decay (mol L−1 h−1); kads, pseudo 1st-
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Efficiency and reactivity pattern of ceria-based noble metal and transition metal-oxide catalysts in the wet air oxidation of phenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 336–345
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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