Reaction intermediates and mechanism of the zeolite-catalyzed transalkylation of 1,2,4-trimethylbenzene with toluene
SCIE
SCOPUS
- Title
- Reaction intermediates and mechanism of the zeolite-catalyzed transalkylation of 1,2,4-trimethylbenzene with toluene
- Authors
- Cha, Seung Hyeok; Hong, Suk Bong
- Date Issued
- 2018-01
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Abstract
- We report the catalytic properties of a series of large-pore (H-Y, H-beta, H-mordenite, and H-UZM-35)
and medium-pore (H-NU-87, H-TNU-9, and H-ZSM-5) zeolites with different framework structures for
the transalkylation of 1,2,4-trimethylbenzene (1,2,4-TMB) with toluene. H-NU-87 with intersecting 10-
and 12-ring channels, but in which access to the inner part of the crystal can only occur through the
10-ring pores, was found to show a significantly higher xylene yield (40% vs. 23% at 673 K and 10 h on
stream) and catalyst stability (31% vs. 17% 1,2,4-TMB conversion after 30 h on stream at 673 K) than
the cage-based large-pore zeolite H-Y, the current commercial transalkylation catalyst. GC–MS analyses
of organic species occluded in used zeolite catalysts reveal that the type of diphenylmethane derivatives
serving as key reaction intermediates of 1,2,4-TMB-toluene transalkylation is strongly influenced by the
pore architecture of the zeolite catalyst. A bimolecular diphenylmethane-mediated reaction mechanism
for this transalkylation is proposed and discussed based on both experimental and theoretical results.
- Keywords
- 1,2,4-TMB-toluene transalkylation; Zeolite catalysts; H-NU-87; Reaction intermediates; Reaction mechanism
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/41029
- DOI
- 10.1016/j.jcat.2017.10.015
- ISSN
- 0021-9517
- Article Type
- Article
- Citation
- JOURNAL OF CATALYSIS, vol. 357, page. 1 - 11, 2018-01
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