- 作者: 柯安男 ; 郭清通
- 作者服務機構: 中興大學化學系
- 中文摘要: The reaction of 1,2,3-trimethylbenzene (1,2,3-TMB) over HY zeolite was investigated in a fixed-bed flow reactor at 200-300.degree.C under atmospheric pressure. The reaction products in include toluene, pentamethylbenzene and isomers of xylene, 1,2,3- TMB and tetramethylbenzene. Based on the time-on-stream theory, the types and initial selectivities of these products were determined from plots of product selectivity. 1,2,4-TMB is initially produced from 1,2,3-TMB via isomerization whereas o-xylene , m-xylene, 1,2,3,4- and 1,2,3,5-tetramethylbenzene were primarily formed by disproportionation of 1,2,3-TMB. Isomerization and disproportionation obeyed first- and second-order kinetics, respectively; both reactions proceeded via a carbonium ion mechanism with the former occurring by methyl transfer on the benzene ring whereas the latter proceeded through the diphenylmethane transition state. The activation energies are 31.6 and 37.2kJ/mol for isomerization and disproportionation, respectively.
- 英文摘要: --
- 中文關鍵字: 1,2,3-Trimethylbenzene; Isomerization; Disproportionation; Hy Zeolite; Activation Energy
- 英文關鍵字: 1;2;3-三甲基苯;異構化;不相稱(不均化);HY沸石;活化能