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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Cycloisomerization of 5-(o-tolyl)-pentene over modified zeolite BEA

Cited 5 times inthomson ciCited 1 times inthomson ci
Title
Cycloisomerization of 5-(o-tolyl)-pentene over modified zeolite BEA
Other Titles
Cycloisomerization of 5-(o-tolyl)-pentene over modified zeolite BEA
Author
Choo, Dae HyunKim, Hae JinKong, Byung HeeChoi, Il SeokKo, Young ChanLee, Hee CheonKim, Jae ChangLee, Jae Sung
Keywords
1,5-dimethyltetralin; zeolite BEA; passivation; Al-27 NMR; Bronsted acid sites; microcrystallites; surface poisoning; external surface acidity
Issue Date
200204
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF CATALYSIS, v.207, no.2, pp.183 - 193
Abstract
Liquid-phase cycloisomerization of 5-(o-tolyl)-pentene (OTP) was conducted using a commercial nanocrystalline zeolite BEA. Zeolite BEA was a good catalyst for selective synthesis of 1,5-dimethyltetralin (1,5-DMT). However, over certain zeolite BEA, isomerization of 1,5-DMT to other isomers occurred after cyclization of OTP was almost complete at high temperatures. Textual properties of nanocrystalline BEA did not influence the cyclization activity, but the degree of postsynthetic treatments such as surface poisoning, passivation, and dealumination had great effects. Reactions over BEA modified by triphenylphosphine poisoning and Si layer coating of the outer surface of zeolite crystatlites revealed that strong acid sites residing only on the external surface of zeolite BEA were responsible for isomerization activity. The Al-27 magic-angle spinning nuclear magnetic resonance study for dealuminated zeolites together with the IR study of adsorbed pyridine clearly demonstrated that the concentration of Bronsted acid sites due to the framework aluminum was directly related to cyclization activity. On the other hand, octahedral aluminum did not participate in either OTP cyclization or DMT isomerization. (C) 2002 Elsevier Science (USA)
URI
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DOI
http://dx.doi.org/10.1006/jcat.2002.3522
ISSN
0021-9517
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