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Titolo:
Highly selective vapor phase Beckmann rearrangement over H-USY zeolites
Autore:
Dai, LX; Koyama, K; Miyamoto, M; Tatsumi, T;
Indirizzi:
Univ Tokyo, Grad Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, JapanUniv Tokyo Tokyo Japan 1138656 ppl Chem, Bunkyo Ku, Tokyo 1138656, Japan
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 2, volume: 189, anno: 1999,
pagine: 237 - 242
SICI:
0926-860X(199912)189:2<237:HSVPBR>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYCLOHEXANONE-OXIME; CATALYSTS; ALUMINUM; FTIR;
Keywords:
Beckmann rearrangement; acidity; USY zeolite; diluent effect; alcohol;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Tatsumi, T Yokohama Natl Univ, Fac Engn, Div Mat Sci & Chem Engn, 79-5 Tokiwadai, Yokohama, Kanagawa 2408501, Japan Yokohama Natl Univ 79-5 TokiwadaiYokohama Kanagawa Japan 2408501
Citazione:
L.X. Dai et al., "Highly selective vapor phase Beckmann rearrangement over H-USY zeolites", APP CATAL A, 189(2), 1999, pp. 237-242

Abstract

The vapor Beckmann rearrangement of cyclohexanone oxime to epsilon-caprolactam catalyzed by H-USY with different SiO2/Al2O3 ratios was studied. The catalytic performance of H-USY zeolites for the highly selective formation of epsilon-caprolactam was greatly improved by adjusting the SiO2/Al2O3 ratio and by using an appropriate diluent. It has been found that H-USY catalysts with SiO2/Al2O3 ratios of 27 and 62 exhibited excellent catalytic activity, selectivity and stability when 1-hexanol was used as diluent. The NH3-TPD results indicate that an appropriate amount of relatively weak acid sites of H-USY zeolites are effective for highly selective Beckmann rearrangement. The interaction of alcohols with H-USY zeolites has been investigated by FT-IR to explain the improving effect of 1-hexanol. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 18/11/17 alle ore 05:50:40