Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Cas phase beckmann rearrangement of cyclohexanone oxime over zirconia-supported boria catalyst
Autore:
Xu, BQ; Cheng, SB; Jiang, S; Zhu, QM;
Indirizzi:
Tsing Hua Univ, State Key Lab C1 Chem, Beijing 100084, Peoples R China Tsing Hua Univ Beijing Peoples R China 100084 ng 100084, Peoples R China Tsing Hua Univ, Dept Chem, Beijing 100084, Peoples R China Tsing Hua UnivBeijing Peoples R China 100084 ng 100084, Peoples R China Dalian Univ Technol, Sch Chem Engn, Dalian 116012, Peoples R China Dalian Univ Technol Dalian Peoples R China 116012 16012, Peoples R China
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1-2, volume: 188, anno: 1999,
pagine: 361 - 368
SICI:
0926-860X(19991105)188:1-2<361:CPBROC>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
VAPOR DECOMPOSITION METHOD; CAPROLACTAM; ZEOLITES;
Keywords:
Beckmann rearrangement; caprolactam; cyclohexanone oxime; boria; zirconia; B2O3/ZrO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Xu, BQ Tsing Hua Univ, State Key Lab C1 Chem, Beijing 100084, Peoples R China Tsing Hua Univ Beijing Peoples R China 100084 84, Peoples R China
Citazione:
B.Q. Xu et al., "Cas phase beckmann rearrangement of cyclohexanone oxime over zirconia-supported boria catalyst", APP CATAL A, 188(1-2), 1999, pp. 361-368

Abstract

Gas phase Beckmann rearrangement of cyclohexanone oxime is studied with B2O3/ZrO2 as the catalyst at 250-350 degrees C. It is shown that B2O3/ZrO2 ishighly active and selective for the synthesis of E-caprolactam at 300-320 degrees C. Activity and selectivity of the B2O3/ZrO2 catalyst are compared with other boria catalysts supported on Al2O3, TiO2, SiO2, MgO, and HZSM-5 (Si/Al= 25) on an 10% B2O3 basis at 300 degrees C. At this boria load level, B2O3/ZrO2 produces the best catalysis for the lactam synthesis. The load level of boria affects the behavior of B2O3/ZrO2 catalyst: increasing the boria load (less than or equal to 20%) results in an increase of the lactam selectivity, but the lactam yield follows variation of the oxime conversionwhich shows a maximum at 10% boria load. Acidity and boria dispersion structure of the B2O3/ZrO2 catalysts are measured, respectively by NH3-TPD and IR spectroscopy. It is shown that the lactam yield is correlated with the number of intermediate strong acid sites that are responsible for ammonia desorption at 200-400 degrees C, The optimum boria load (10%) of the B2O3/ZrO2 catalyst corresponds to two overlayers of boria on the support. The firstlayer of boria interacts directly with the support surface with tetrahedral BO4 as the structure unit; the other layers of boria are constructed by trigonal BO3 units. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/11/17 alle ore 05:51:25