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Ce-V loaded metal oxides as catalysts for dechlorination of chloronitrophenol by ozone

Paper ID Volume ID Publish Year Pages File Format Full-Text
45935 46427 2014 10 PDF Available
Title
Ce-V loaded metal oxides as catalysts for dechlorination of chloronitrophenol by ozone
Abstract

•Dechlorination chloronitrophenol.•Chlorine free products using ozonation.•Oxidative degradation with evidence of partial mineralization.•100% conversion using 2.5% and 5% Ce-V on SiO2 as catalyst in 4 h.

We report the catalytic degradation of chloronitrophenol (CNP) facilitated by ozone using cerium-vanadium oxide loaded on metal oxides supports alumina and silica as catalysts. The catalyzed ozonation markedly accelerated the degradation of CNP. Catalyst materials were synthesized and characterized by using various surface characterization techniques including XRD, BET, TPD, ICP, SEM, TEM and FT-IR. The influences of hydroxyl radical scavengers, pH values, and reaction products on degradation were investigated. Alkaline pH facilitated and accelerated the generation of hydroxyl radicals by the heterogeneous catalyst. The oxidation products formed in the reaction were characterized by 1H NMR and LC–MS mass spectral data. 3,4-Dihydroxyhexa-2,4-dienedioic acid (DDA), 2-hydroxymaleic acid (HMA) and oxalic acid (OA) were the main oxidation products. 5% Ce-V/SiO2 proved to be economical and feasible choice for catalytic ozonation and dechlorination of CNP in water.

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Keywords
Chloronitrophenol; Dihydroxyhexadienedioic acid; Ozone; Cerium; Vanadium
First Page Preview
Ce-V loaded metal oxides as catalysts for dechlorination of chloronitrophenol by ozone
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 305–314
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis