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Benzene reduction in gasoline by alkylation with olefins: Comparison of Beta and MCM-22 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41102 45877 2012 9 PDF Available
Title
Benzene reduction in gasoline by alkylation with olefins: Comparison of Beta and MCM-22 catalysts
Abstract

The study compares the performance of Beta and MCM-22 zeolites as catalysts for propylene alkylation of benzene present in an enriched sample of reformate heart cut (20 wt% benzene). The experiments were carried out in a batch system with a 2/1 mole ratio of benzene/propylene at 220 °C for 1 h. An MCM-22 zeolite that contained Brønsted/Lewis acid sites in a 2–3/1 ratio proved to be much more resistant to deactivation during these real feed benzene alkylation experiments when compared with the Beta catalyst (Brønsted/Lewis acid site ratio of 0.1–0.3/1). MCM-22 with a 45 wt% benzene conversion presented higher i-propylbenzene selectivity than Beta (38 wt% benzene conversion) by reducing the formation of by-products. The outstanding behavior of MCM-22 may be explained by its particular Brønsted to Lewis acid ratio, which could help in the carbonium-ion formation and in the activation of the benzene ring toward electrophilic attack, and to its open crystalline framework that facilitates diffusion of reactants, products and coke precursors. Additional studies regarding experimental conditions for the preparation of MCM-22 and alkylation procedures are required for optimization.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (176 K)Download as PowerPoint slideHighlights► Propylene alkylation of the benzene present in a real feed was successfully attained. ► MCM-22 presented a lower deactivation rate than Beta catalyst. ► MCM-22 presented higher yield and higher IPB selectivity than Beta catalyst. ► MCM-22 outstanding behavior may relay on its Brønsted and Lewis acid ratio. ► MCM-22 open crystalline framework may facilitate the diffusion process.

Keywords
Gasoline; Benzene; Alkylation; Propylene; IPB; Zeolite Beta; Zeolite MCM-22
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Benzene reduction in gasoline by alkylation with olefins: Comparison of Beta and MCM-22 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 140–148
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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