The ethylation of biphenyl over H-mordenite: Reactivities of the intermediates in the catalysis

摘要: Abstract The ethylation of biphenyl (BP) with ethene was examined over dealuminated H-mordenite (MOR; SiO 2 /Al O 3  = 206). occurred non-shape-selectively, and gave a mixture ethylbiphenyls (EBPs), diethylbiphenyls (DEBPs), higher ethylates. BP to EBPs yielded in the ratio, 2-EBP:3-EBP:4-EBP = 2:2:1 at initial stages. reaction occurs under kinetic control. formation 4,4′-DEBP less selective than that other isomers; however, combined selectivity for DEBPs 4-ethyl groups 80% during reaction. 4-EBP consumed rapidly DEBPs. Less bulky DEBPs, particularly, disappeared preferentially compared These results show MOR channels are too large shape-selective by “restricted transition state mechanism”. reactivities intermediates decreased order: 4,4′-DEBP > 4-EBP > BP ≫ 3-EBP ≫ 2-EBP. three EBP isomers have quite different further ethylation: yield groups. 3-EBP partly participated high conversion; 2-EBP not ethylated even conversion. Further, ethylates because it is most reactive among BP, EBPs, their were due “reactant Molecular modeling diffusion products suggests all can diffuse channels. preferential disappearance difference isomers. simulations corresponding experimental results.