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Continuous synthesis of bis(indolyl)phenylmethane over acid modified Hβ zeolite

Paper ID Volume ID Publish Year Pages File Format Full-Text
40963 45872 2012 5 PDF Available
Title
Continuous synthesis of bis(indolyl)phenylmethane over acid modified Hβ zeolite
Abstract

The continuous synthesis of bis(indolyl)phenylmethane has been successfully accomplished for the first time by Friedel-Crafts alkylation of indole with benzaldehyde in a fixed-bed reactor over different zeolites. A citric acid modified Hβ (CA-Hβ) zeolite showed better catalytic performance than parent Hβ zeolite due to its larger surface area and smaller amount of weak acid sites, confirmed by the Brunauer–Emmett–Teller (BET) method, NH3 temperature-programmed desorption (NH3-TPD) and Fourier Transform Infrared Spectrometer after adsorption of pyridine (Py-IR). Furthermore, it is proposed that citric acid treatment is appropriate for dealumination of Hβ zeolite, which results in the CA-Hβ zeolite having a larger number of active centers for the desired transformation. Significantly, CA-Hβ has shown good stability during a 100 h test.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (114 K)Download as PowerPoint slideHighlights► Modified Hβ zeolite was used for synthesis of bis(indolyl)phenylmethane (BIPM). ► A continuous process for synthesis of BIPM over zeolites was first established. ► A citric acid modified Hβ zeolite has shown good activity and excellent stability. ► Dealumination and weak acid sites were proven to favor the desired transformation.

Keywords
Bis(indolyl)phenylmethane; Continuous synthesis; Hβ zeolite; Citric acid modification; Stability
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Continuous synthesis of bis(indolyl)phenylmethane over acid modified Hβ zeolite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 114–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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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