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Isomerization and Disproportionation of 1,2,4‐Trimethylbenzene over HY Zeolite
Author(s) -
Ko AnNan,
Kuo Ching Tung
Publication year - 1994
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199400019
Subject(s) - chemistry , disproportionation , isomerization , zeolite , photochemistry , organic chemistry , catalysis
The conversion of 1,2,4‐trimethy]benzene (1,2,4‐TMB) over HY zeolite was studied at atmosoheric pressure and 200–300 °C by using a fixed‐bed, integral‐flow reactor. The types and initial selectivities of various products were obtained from plots of product selectivity according to the time‐on‐stream theory. The primary reaction included the isomerization and the disproportionation; the former led to the simultaneous formation of 1,2.3‐ and 1,3,5‐TMB whereas the latter produced all isomers of xylene and tetramethylbenzene. The relative initial rate of disproportionation to isomerization decreased from 12.6 at 200 °C to 5.47 at 300 °C. The activation energies for the primary reactions were estimated and compared with those in the reaction of 1,2,3‐TMB.