fulltext.study @t Gmail

Shape-selective alkylation of biphenyl with propylene using zeolite and amorphous silica–alumina catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40396 45852 2013 9 PDF Available
Title
Shape-selective alkylation of biphenyl with propylene using zeolite and amorphous silica–alumina catalysts
Abstract

The influence of zeolite structure for the alkylation of biphenyl with propylene was studied over various zeolites such as HY, HZSM-5, and dealuminated mordenite (DMOR), as well as amorphous SiO2/Al2O3, in a stirred tank reactor. Biphenyl conversion was found to increase with reaction time for HZSM-5 and DMOR zeolites and reach a leveling off in 4 h, whereas for HY and amorphous SiO2/Al2O3 a leveling off was reached within an hour. DMOR displayed the highest selectivity for 4,4′-diisopropylbiphenyl (4,4′-DIPB) even at temperatures as high as 300 °C, whereas for HY, HZSM-5 and amorphous SiO2/Al2O3 selectivities fell in the range of 10–35%; they were significantly lower than observed for DMOR. These differences in selectivity might be due to the structure and pore channels of the zeolites. DMOR was found to be an active catalyst, the selectivity for 4-isopropylbiphenyl (4-IPB) and (4,4′-DIPB) was high among isopropylbiphenyl (IPB) and diisopropylbiphenyl (DIPB) isomers, respectively, indicating DMOR possesses shape-selectivity. The selectivity of 4,4′-DIPB increased with time, while the corresponding selectivity of 4-IPB decreased for DMOR catalyst. Alkylation of biphenyl with propylene occurred with predominant formation of 4-IPB in the first step. 4-IPB is only a source in the second step of alkylation of biphenyl with propylene for the formation of 4,4′-DIPB, while 3-IPB does not participate in the formation of DIPB isomers.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (200 K)Download as PowerPoint slideHighlights► Shape-selective alkylation of biphenyl with propylene was achieved over HMOR. ► Zeolite shape selectivity was governed by geometry of channels and pore entrances. ► Biphenyl alkylation proceeds through 4-IPB in a consecutive mechanism. ► 4-IPB is only a source in step 2 for further alkylation to form 4,4′-DIPB.

Keywords
Alkylation; Biphenyl; Propylene; Mordenite; Zeolites; Shape-selectivity
First Page Preview
Shape-selective alkylation of biphenyl with propylene using zeolite and amorphous silica–alumina catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 195–203
Authors
, , , , , , ,
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