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Titolo:
Structure-activity relationships for Co- and Fe-promoted vanadium phosphorus oxide catalysts
Autore:
Sajip, S; Bartley, JK; Burrows, A; Sanenes-Schulz, MT; Tuel, A; Volta, JC; Kiely, CJ; Hutchings, GJ;
Indirizzi:
Univ Liverpool, Dept Engn, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England Univ Liverpool, Dept Chem, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3TB ardiff CF10 3TB, S Glam, Wales Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France Inst Rech CatalyseVilleurbanne France F-69626 9626 Villeurbanne, France
Titolo Testata:
NEW JOURNAL OF CHEMISTRY
fascicolo: 1, volume: 25, anno: 2001,
pagine: 125 - 130
SICI:
1144-0546(2001)25:1<125:SRFCAF>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-BUTANE OXIDATION; LASER RAMAN-SPECTROSCOPY; MALEIC-ANHYDRIDE; VPO CATALYSTS; SELECTIVE OXIDATION; REFERENCE PHASES; TRANSFORMATION; ACTIVATION; PRECURSORS; STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Kiely, CJ Univ Liverpool, Dept Engn, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX de, England
Citazione:
S. Sajip et al., "Structure-activity relationships for Co- and Fe-promoted vanadium phosphorus oxide catalysts", NEW J CHEM, 25(1), 2001, pp. 125-130

Abstract

The effect of Co and Fe doping on vanadium phosphate catalysts, prepared by the reaction of V2O5 and H3PO4 with isobutanol, for the oxidation of n-butane to maleic anhydride is described and discussed. At low levels, both Coand Fe dopants significantly enhance the selectivity and the intrinsic activity to maleic anhydride. A combination of powder X-ray diffraction, P-31 NMR spin-echo mapping spectroscopy and transmission electron microscopy, together with catalyst test data, is utilised to analyse the origin of the effects of Co doping. Co appears to be essentially insoluble in crystalline (VO)(2)P2O7 and is preferentially distributed in and stabilises an amorphousVPO material. It is suggested that the origin of the promotional effect ofCo is associated with its interaction with the disordered VPO phase. The same techniques have been used to analyse the Fe-doped catalyst, but at present it is not possible to be definitive concerning the specific location ofthe Fe-dopant within the phases present. Previous studies have indicated that Fe can form a solid solution within (VO)(2)P2O7 and therefore it is probable that the Fe may act as an electronic promoter for this phase. The role of Co, however, emphasises the importance of amorphous vanadium phosphatephases in the catalyst system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/08/20 alle ore 16:02:02