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Titolo:
Characterization of active sites working on FSM-16 during the vapor-phase Beckmann rearrangement of cyclohexanone oxime
Autore:
Shouro, D; Ohya, Y; Mishima, S; Nakajima, T;
Indirizzi:
Shinshu Univ, Grad Sch Sci & Technol, Nagano 3808553, Japan Shinshu Univ Nagano Japan 3808553 h Sci & Technol, Nagano 3808553, Japan
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1, volume: 214, anno: 2001,
pagine: 59 - 67
SICI:
0926-860X(20010615)214:1<59:COASWO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MESOPOROUS SILICA FSM-16; DECOMPOSITION METHOD; OXIDE CATALYSTS; ZEOLITES;
Keywords:
ring opening of epsilon-caprolactam; deactivation; FSM-16; Beckmann rearrangement;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Shouro, D Shinshu Univ, Grad Sch Sci & Technol, 4-17-1 Wakasato, Nagano 3808553, Japan Shinshu Univ 4-17-1 Wakasato Nagano Japan 3808553 808553, Japan
Citazione:
D. Shouro et al., "Characterization of active sites working on FSM-16 during the vapor-phase Beckmann rearrangement of cyclohexanone oxime", APP CATAL A, 214(1), 2001, pp. 59-67

Abstract

The behaviors of E-caprolactam, cyclohexanone oxime and Beckmann rearrangement by-products on FSM-16 and Al2O3/FSM-16 have been investigated in detail by means of TPD and reactions in the presence of organic acids and pyridine. The TPD spectra on FSM-16 of epsilon -caprolactam. cyclohexanone oxime,Beckmann rearrangement by-products and mixtures of by-products can be explained by postulating that there are four kinds of active sites, i.e. two kinds of nitrile formation sites (Sites A and R), a cyclohexanone formation site (Site B) and a nitrile adsorption site (Site alpha). The TPDs of cyclohexanone oxime adsorbed on Al2O3/FSM-16 in the presence and absence of watervapor suggest that the presence of water accelerates the formation of cyclohexanone on Site B. Addition of acetic acid suppresses conversion of epsilon -caprolactam to nitriles, and that addition of pyridine has no effect onthe TPD spectrum. Addition of acetic acid to the reactant during the Beckmann rearrangement on Al2O3/FSM-16 improved the epsilon -caprolactam yield and catalyst's life. (C) 2001 Elsevier Science B,V. All rights reserved.

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Documento generato il 18/11/17 alle ore 05:51:41