| 학회 |
한국화학공학회 |
| 학술대회 |
2012년 가을 (10/24 ~ 10/26, 부산 BEXCO) |
| 권호 |
18권 2호, p.2430 |
| 발표분야 |
촉매 및 반응공학 |
| 제목 |
Mechanistic Insights into the Zeolite-Catalyzed Isomerization and Disproportionation of m-Xylene |
| 초록 |
The mechanisms of m-xylene isomerization and disproportionation over thirteen medium-pore zeolites and three large-pore ones are investigated. H-TNU-10 and H-ZSM-57 with intersecting 10- and 8-ring channels were found to show considerably higher p/o-xylene and isomerization/disproportionation ratios than H-ZSM-5, a commercial m-xylene isomerization catalyst. The GC-MS results from used zeolite catalysts demonstrate the intrazeolitic build-up of tri- and tetramethylated diphenylmethane species, whose existence during the m-xylene transformation over any acidic catalyst has not been experimentally verified until now. These bicyclic aromatic compounds were ascertained to serve as reaction intermediates of bimolecular m-xylene isomerization within the micropores not only of large-pore zeolites but also of medium-pore materials at temperatures lower than 250 °C or so, once there are internal void spaces larger than 10-rings. The overall GC-MS results of our work demonstrate that transition state and product shape selectivities are experimentally distinguishable from each other. |
| 저자 |
민형기, 차승혁, 홍석봉
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| 소속 |
포항공과대 |
| 키워드 |
Zeolite; Reaction mechanism; m-Xylene isomerization
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| E-Mail |
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| 원문파일 |
초록 보기 |
