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Titolo:
Study of the Co-VPO interaction in promoted n-butane oxidation catalysts
Autore:
Carrara, C; Irusta, S; Lombardo, E; Cornaglia, L;
Indirizzi:
UNL, CONICET, FIQ, INCAPE Inst Invest Catalisis & Petroquim, RA-3000 SantaFe, Argentina UNL Santa Fe Argentina RA-3000 s & Petroquim, RA-3000 SantaFe, Argentina
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1-2, volume: 217, anno: 2001,
pagine: 275 - 286
SICI:
0926-860X(20010903)217:1-2<275:SOTCII>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOSPHORUS-OXIDE CATALYSTS; P-O CATALYSTS; SELECTIVE OXIDATION; MALEIC-ANHYDRIDE; VANADYL PYROPHOSPHATE; OXYGEN CATALYSTS; COBALT; SURFACE; XPS; SPECTROSCOPY;
Keywords:
VPO; n-butane oxidation; maleic anhydride; promoters; cobalt; Lewis acidity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Cornaglia, L UNL, CONICET, FIQ, INCAPE Inst Invest Catalisis & Petroquim, Santiago Estero 2829, RA-3000 Santa Fe, Argentina UNL Santiago Estero 2829 Santa Fe Argentina RA-3000 rgentina
Citazione:
C. Carrara et al., "Study of the Co-VPO interaction in promoted n-butane oxidation catalysts", APP CATAL A, 217(1-2), 2001, pp. 275-286

Abstract

Cobalt-impregnated VPO catalysts were prepared using different cobalt salts and impregnation methods. The catalytic tests showed that cobalt impregnation significantly increased the overall activity. The use of cobalt acetylacetonate led to a more selective high loading catalyst. To investigate the origin of the cobalt effect, the solids were characterized using XRD, Raman spectroscopy, FT-IR, and XPS. The surface acidity was probed by adsorbing acetonitrile. No structural effects were detected through XRD. After 700hon stream, the only phase detected in all cases was V(IV) vanadyl pyrophosphate. The surface oxidation state of vanadium was V(IV). The Co 2p XP spectrum showed an intense shoulder at 788 eV, indicating that Co(II) species were present. The concentration of very strong Lewis acid sites increased athigher cobalt loading, but its strength was unaffected. (C) 2001 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 08/08/20 alle ore 09:06:32