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Titolo:
Solvent effects in the liquid-phase Beckmann rearrangement of oxime over H-Beta catalyst II: adsorption and FT-IR studies
Autore:
Chung, YM; Rhee, HK;
Indirizzi:
Seoul Natl Univ, Sch Chem Engn, Inst Chem Proc, Kwanak Ku, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 k Ku, Seoul 151742, South Korea
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 175, anno: 2001,
pagine: 249 - 257
SICI:
1381-1169(20011023)175:1-2<249:SEITLB>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYCLOHEXANONE OXIME; GAS-PHASE; ZEOLITE;
Keywords:
Beckmann rearrangement; cyclohexanone oxime; caprolactam; adsorption; solvent effect; dielectric constant; zeolite catalyst;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Rhee, HK Seoul Natl Univ, Sch Chem Engn, Inst Chem Proc, Kwanak Ku, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 ul 151742, South Korea
Citazione:
Y.M. Chung e H.K. Rhee, "Solvent effects in the liquid-phase Beckmann rearrangement of oxime over H-Beta catalyst II: adsorption and FT-IR studies", J MOL CAT A, 175(1-2), 2001, pp. 249-257

Abstract

Solvent effect has been investigated in the liquid-phase Beckmann rearrangement of cyclohexanone oxime over H-Beta catalyst. Co-adsorption of substrate and solvent suggests that the facility of protonation of oxime is primarily dependent upon the competitive adsorption between substrate and solvent. On the other hand, the result of IR study indicates that the N-protonation of oxime is largely preferred to the O-protonation and the 1,2-H-shift ispossibly more energy-demanding than the subsequent rearrangement. In addition, it is revealed that there is an interaction between the protonated oxime and a polar solvent. This implies that there exists a quite stable five-membered ring complex which may decrease the energy barrier of the 1,2-H-shift significantly. In this regard, a solvent making a balance between thesetwo competitive factors is considered suitable for the liquid-phase Beckmann rearrangement of oxime over solid-acid catalyst. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 18/11/17 alle ore 05:50:52