NDLI: The isopropylation of biphenyl over H-mordenite — Roles of 3- and 4-isopropylbiphenyls

Content Provider	Springer Nature Link
Author	Anand, Chokkalingam Sugimura, Tomori Komura, Kenichi Kubota, Yoshihiro Kim, Jong Ho Seo, Gon Vinu, Ajayan Sugi, Yoshihiro
Copyright Year	2013
Abstract	The isopropylation of biphenyl (BP) and 3- and 4-isopropylbiphenyls (3- and 4-IPBPs) was examined over H-mordenites (MOR) to elucidate the mechanism of shape-selective formation of 4,4′-diisopropylbiphenyl (4,4′-DIPB). The isopropylation of BP occurred predominantly to form 4-isopropylbiphenyl (4-IPBP) from BP and 4,4′-DIPB from 4-IPBP. However, 3-IPBP, a minor isomer from BP, cannot participate effectively in the formation of 3,4′-DIPB due to steric restriction of its isopropyl moiety with MOR channels. Selective formation of 4,4′-DIPB was observed at low to moderate temperatures: 225–275 °C. However, the selectivities for 4,4′-DIPB were decreased at high temperatures, 300–350 °C under propene pressure, 0.8MPa, by the isomerization of 4,4′-DIPB at external acid sites. The isomerization of 4,4′-DIPB occurred under low propene pressure even at 250 °C. The roles of 3- and 4-IPBPs in the formation of DIPB isomers were examined in the isopropylation of their mixtures. 4-IPBP was consumed much faster than 3-IPBP in all cases examined. 4-IPBP was an exclusive precursor to DIPB isomers, particularly 4,4′-DIPB. 4,4′-DIPB was also found as a predominant isomer in encapsulated products at all conditions examined. These results show that 4-IPBP can preferentially establish active transition state with propene and acid site in MOR channels, resulting in selective formation of 4,4′-DIPB. It is concluded that the isopropylation of BP over MOR occurs through reactant selectivity mechanism and restricted transition state mechanism, but not through product selectivity mechanism.
Starting Page	1043
Ending Page	1050
Page Count	8
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	30
Issue Number	5
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2013-02-21
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MOR Isopropylation Biphenyl 4,4′-Diisopropylbiphenyl 4- and 3-Isopropylbiphenyls Shape-selective Catalysis Industrial Chemistry/Chemical Engineering Catalysis Materials Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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