Isopropylation of biphenyl over ZSM-12 zeolites

Chokkalingam, Anand, Kawagoe, Hiroaki, Watanabe, Seiji, Moriyama, Yasuhiro, Komura, Kenichi, Kubota, Yoshihiro, Kim, Jong-Ho, Seo, Gon, Vinu, Ajayan and Sugi, Yoshihiro (2013) Isopropylation of biphenyl over ZSM-12 zeolites. Journal of Molecular Catalysis A-Chemical, 367 23-30. doi:10.1016/j.molcata.2012.10.018

Author Chokkalingam, Anand
Kawagoe, Hiroaki
Watanabe, Seiji
Moriyama, Yasuhiro
Komura, Kenichi
Kubota, Yoshihiro
Kim, Jong-Ho
Seo, Gon
Vinu, Ajayan
Sugi, Yoshihiro
Title Isopropylation of biphenyl over ZSM-12 zeolites
Journal name Journal of Molecular Catalysis A-Chemical   Check publisher's open access policy
ISSN 1381-1169
Publication date 2013-02-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.molcata.2012.10.018
Volume 367
Start page 23
End page 30
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Formatted abstract
ZSM-12 zeolites, ZSM-12L and ZSM-12S, with MTW topology were synthesized by using methyltriethylammonium bromide (MTEABr) and tetraethylammnoium bromide (TEABr) as structure directing agents (SDA), respectively, for the isopropylation of biphenyl (BP) using propene as an alkylating agent. The particle sizes of the ZSM-12L and ZSM-12S were in the range of 5-10 μm and less than 0.5 μm, respectively. The selectivities for 4,4′- diisopropylbiphenyl (4,4′-DIPB) were 60-70% for ZSM-12L and 40-50% for ZSM-12S at lower temperatures below 275 °C, and rapidly decreased with further increase in temperatures to less than 20% at 350 °C over both zeolites. The kinetic controlled catalyses on external acid sites at lower temperatures were resulted in the formation of bulkier isomers, 2,x′-DIPB (x:2,3,4). The decreases in the selectivity for 4,4′-DIPB occurred by the isomerization of 4,4′-DIPB to stable isomers, 3,4′- and 3,3′-DIPB on external acid sites at higher temperatures. These catalyses were decreased remarkably over ZSM-12LD prepared by the dealumination of ZSM-12L with EDTA-3Na, because of effective removal of external acid sites. The isopropylation of BP over ZSM-12 zeolites was moderately shape-selective for the formation of 4,4′-DIPB at appropriate temperatures, particularly over ZSM-12L and ZSM-12LD. The formation of 4,4′-DIPB occurred primarily near pore-entrances but not deep in the channels. ZSM-12 channels are less effective for the selective formation of 4,4′-DIPB than MOR channels.
Keyword Zsm-12
Particle size
Shape selective catalysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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