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A simple and efficient zeolite catalyst for toluene oxidation in aqueous media

Paper ID Volume ID Publish Year Pages File Format Full-Text
40942 45871 2012 8 PDF Available
Title
A simple and efficient zeolite catalyst for toluene oxidation in aqueous media
Abstract

In this work, it was found that alkali-treated zeolites could efficiently catalyze oxidation of toluene with H2O2 in aqueous media. No heavy metals or their oxides were employed in the synthesis of catalyst and no additives were used in this catalytic system. Through optimizing the experimental conditions, alkali-treated HZSM-5 exhibited good catalytic activity for toluene oxidation in only 5 h at a low temperature (below 100 °C): 32.0% conversion of toluene with selective formation of 25.0% benzaldehyde, 20.8% benzyl alcohol and 27.5% benzoic acid. Moreover, the results of reusability studies indicated that alkali-treated HZSM-5 was a durable and green catalyst for toluene oxidation in aqueous media. The changes in acidities and textural features of the zeolites induced by alkali-treatment were characterized by ammonia temperature programmed desorption (NH3-TPD) and X-ray powder diffraction (XRD), respectively. The results indicated the reactivity for toluene oxidation could be related to the amount of species Al and AlOH in this system. A probable redox mechanism for toluene oxidation catalyzed by alkali-treated zeolites in aqueous media was proposed in this work.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (200 K)Download as PowerPoint slideHighlights► Alkali-treated zeolites showed good catalytic activity for toluene oxidation. ► Pure water was firstly used as the sole medium for toluene oxidation. ► No heavy metals or their oxides were employed in this catalytic system. ► A probable redox mechanism for toluene oxidation in water media was firstly proposed. ► This heterogeneous catalytic process is environment-friendly.

Keywords
Aqueous media; Toluene oxidation; Heterogeneous catalysis; Alkali-treatment
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A simple and efficient zeolite catalyst for toluene oxidation in aqueous media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 425–426, 28 May 2012, Pages 191–198
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