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Modification of Cs-X for styrene production by side-chain alkylation of toluene with methanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
54516 47012 2014 7 PDF Available
Title
Modification of Cs-X for styrene production by side-chain alkylation of toluene with methanol
Abstract

•Addition of Cs2O to Cs-X enhances the activity but decreases the styrene selectivity.•Addition of ZrB2O5 to Cs2O/Cs-X enhances the activity and the styrene selectivity.•Transfer hydrogenation of styrene with methanol is main pathway to ethylbenzene.•Grinding Cs2O/Cs-X with ZrB2O5 followed by calcination yields efficient catalyst.

Effects of modification of cesium ion-exchanged zeolite X (Cs-X) with Cs2O and zirconium borate (ZrB2O5) on the catalytic activity in the side-chain alkylation of toluene to styrene and ethylbenzene were studied to prepare an effective catalyst for styrene production. The toluene conversion to styrene and ethylbenzene increased but the selectivity to styrene decreased on modification of Cs-X with Cs2O. For the toluene conversion, the optimum loading of Cs2O was in the range ca. 1–5 wt%. Modification of Cs2O/Cs-X with ZrB2O5 increased both toluene conversion and styrene selectivity. Characterization of acidic and basic properties by IR spectroscopy of adsorbed pyridine and CO2 indicated that basic properties were markedly enhanced but acidic properties were not changed by modification of Cs-X with Cs2O. It is suggested that the enhancement of toluene conversion by modification with Cs2O is due to the generation of strong basic sites which promote the activation of toluene by an abstraction of a proton from methyl group. Modification with ZrB2O5 facilitates the formation of formaldehyde to increase the toluene conversion and suppresses the transfer hydrogenation of styrene with methanol, the main pathway to ethylbenzene, to increase the styrene selectivity.

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Keywords
Toluene; Methanol; Styrene; Ethylbenzene; Cesium oxide-loaded cesium ion-exchanged zeolite (Cs2O/Cs-X); Zirconium borate
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Modification of Cs-X for styrene production by side-chain alkylation of toluene with methanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 226, 1 May 2014, Pages 117–123
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