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Selective oxidation of ethylbenzene over CeAlPO-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
41294 45884 2011 9 PDF Available
Title
Selective oxidation of ethylbenzene over CeAlPO-5
Abstract

CeAlPO-5(Al/Ce = 25, 50, 75, 100 and 125) molecular sieves were synthesized hydrothermally in fluoride medium and their structures were confirmed from an XRD analysis. The incorporation of Ce3+ into the framework was verified by XRD and DRS-UV–Vis analyses. The surface areas were in the range of 202–215 m2 g−1. The ESR spectrum revealed the presence of adsorbed oxygen which was evident from the peak at g = 2.0. The catalytic activity of molecular sieves was tested in the vapour phase oxidation of ethylbenzene between 150 and 250 °C. CeAlPO-5(25) showed higher conversion than other catalysts. The selectivity to acetophenone was above 90% at all the temperatures. The selective oxidation of methylene group was ascribed to slow rotation of the ethyl group compared to its methyl group at the reaction temperature. Cerium was not leached out in CeAlPO-5(25) even after activation of the spent catalyst at 550 °C. The time on stream study also indicated the absence of catalyst deactivation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (97 K)Download as PowerPoint slideHighlights► A novel route for the synthesis of CeAlPO-5 catalysts is devised. ► High activity of ethylbenzene oxidation and high selectivity to acetophenone are reported. ► A new mechanism is suggested for selective oxidation. ► The oxidation process can be applied to industries.

Keywords
CeAlPO-5; Hydrothermal synthesis; Fluoride medium; Ethylbenzene; Oxidation; Acetophenone
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 407, Issues 1–2, 4 November 2011, Pages 76–84
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
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Any Questions? feel free to contact us