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Preparation of an active and regenerable catalyst for liquid-phase alkylation of toluene with 1-decene

Paper ID Volume ID Publish Year Pages File Format Full-Text
39851 45837 2014 6 PDF Available
Title
Preparation of an active and regenerable catalyst for liquid-phase alkylation of toluene with 1-decene
Abstract

•Catalytic performance of zeolite Y in the synthesis of alkyl aromatics.•Structure collapse after oxidative regeneration of its unmodified H-form.•Improvement of activity and stability towards regeneration.•Hydrothermal treatment at 560 °C with subsequent ion-exchange with ammonium ions.•Activity sustains after four cycles alkylation–regeneration.

Zeolite Y was tested as an alternative solid acid catalyst for the production of linear alkyl aromatics with the emphasis on its activity and stability towards regeneration. Liquid-phase alkylation of toluene with 1-decene at 100 °C was used as the model reaction. Deactivated catalyst samples were regenerated by the temperature programmed calcination (TPC) in air flow at 550 °C. The activity of the unmodified HY zeolite during alkylation was significant but decreased to a minimum after regeneration, as a result of a partial structure collapse during regeneration using TPC. To avoid the structure collapse hydrothermal stabilization of zeolite Y at 560, 670 and 780 °C was performed. Subsequent chemical dealumination using 0.5 M HCl or ion-exchange with the 2 M NH4NO3 solution, in order to improve the catalyst activity, were carried out. All the samples were then tested in alkylation. The main monitored parameters were the conversion of 1-decene, selectivity to 2-phenyldecane isomer and the amount of side-products. The sample stabilized at 560 °C and ion-exchanged subsequently showed the highest activity with the lowest amount of by-products. This sample was also regenerated and reused four times in the cycle alkylation–regeneration with no loss of structure or activity. In fact there was a slight activity increase of this sample after regeneration.

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Keywords
Alkylation; Toluene; 1-Decene; Zeolite Y stability; Activity during alkylation; Regeneration
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Preparation of an active and regenerable catalyst for liquid-phase alkylation of toluene with 1-decene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 475, 5 April 2014, Pages 341–346
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