naa a22 4500 510821049 CHVBK 20180411083532.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11814-013-0011-1 doi (NATIONALLICENCE)springer-10.1007/s11814-013-0011-1 The isopropylation of biphenyl over H-mordenite — Roles of 3- and 4-isopropylbiphenyls [Elektronische Daten] [Chokkalingam Anand, Tomonori Sugimura, Kenichi Komura, Yoshihiro Kubota, Jong-Ho Kim, Gon Seo, Ajayan Vinu, Yoshihiro Sugi] 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. Korean Institute of Chemical Engineers, Seoul, Korea, 2013 MOR nationallicence Isopropylation nationallicence Biphenyl nationallicence 4,4′-Diisopropylbiphenyl nationallicence 4- and 3-Isopropylbiphenyls nationallicence Shape-selective Catalysis nationallicence Anand Chokkalingam The Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, 4072, Brisbane, QLD, Australia aut Sugimura Tomonori Department of Materials Science and Technology, Faculty of Engineering, Gifu University, 501-1193, Gifu, Japan aut Komura Kenichi Department of Materials Science and Technology, Faculty of Engineering, Gifu University, 501-1193, Gifu, Japan aut Kubota Yoshihiro Department of Materials Science and Technology, Faculty of Engineering, Gifu University, 501-1193, Gifu, Japan aut Kim Jong-Ho School of Applied Chemical Engineering, Chonnam National University, 500-757, Gwangju, Korea aut Seo Gon School of Applied Chemical Engineering, Chonnam National University, 500-757, Gwangju, Korea aut Vinu Ajayan The Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, 4072, Brisbane, QLD, Australia aut Sugi Yoshihiro The Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, 4072, Brisbane, QLD, Australia aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/5(2013-05-01), 1043-1050 0256-1115 30:5<1043 2013 30 11814 https://doi.org/10.1007/s11814-013-0011-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-013-0011-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Anand Chokkalingam The Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, 4072, Brisbane, QLD, Australia aut NATIONALLICENCE 700 1- Sugimura Tomonori Department of Materials Science and Technology, Faculty of Engineering, Gifu University, 501-1193, Gifu, Japan aut NATIONALLICENCE 700 1- Komura Kenichi Department of Materials Science and Technology, Faculty of Engineering, Gifu University, 501-1193, Gifu, Japan aut NATIONALLICENCE 700 1- Kubota Yoshihiro Department of Materials Science and Technology, Faculty of Engineering, Gifu University, 501-1193, Gifu, Japan aut NATIONALLICENCE 700 1- Kim Jong-Ho School of Applied Chemical Engineering, Chonnam National University, 500-757, Gwangju, Korea aut NATIONALLICENCE 700 1- Seo Gon School of Applied Chemical Engineering, Chonnam National University, 500-757, Gwangju, Korea aut NATIONALLICENCE 700 1- Vinu Ajayan The Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, 4072, Brisbane, QLD, Australia aut NATIONALLICENCE 700 1- Sugi Yoshihiro The Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, 4072, Brisbane, QLD, Australia aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/5(2013-05-01), 1043-1050 0256-1115 30:5<1043 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer