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Titolo:
In situ laser Raman spectroscopy studies of the transformation of VOHPO4 center dot 0.5H(2)O and (VO)(2)P2O7
Autore:
Sanchez, FJC; Wells, RPK; Rhodes, C; Bartley, JK; Kiely, CJ; Hutchings, GJ;
Indirizzi:
Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3TB ardiff CF10 3TB, S Glam, Wales Univ Liverpool, Dept Chem, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England Univ Liverpool, Dept Mat Sci & Engn, Liverpool L69 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 18, volume: 3, anno: 2001,
pagine: 4122 - 4128
SICI:
1463-9076(20010915)3:18<4122:ISLRSS>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-BUTANE OXIDATION; PHOSPHORUS OXIDE CATALYSTS; SELECTIVE OXIDATION; MALEIC-ANHYDRIDE; VANADYL PYROPHOSPHATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Hutchings, GJ Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3TB B, S Glam, Wales
Citazione:
F.J.C. Sanchez et al., "In situ laser Raman spectroscopy studies of the transformation of VOHPO4 center dot 0.5H(2)O and (VO)(2)P2O7", PHYS CHEM P, 3(18), 2001, pp. 4122-4128

Abstract

A detailed study of three samples of vanadyl hemihydrate, VOHPO4.0.5H(2)O,and vanadyl pyrophosphate, (VO)(2)P2O7, prepared using different methods is described and discussed. VOHPO4.0.5H(2)O, prepared using (a) the VPA method (V2O5 and H3PO4 refluxed in aqueous HCl), (b) the VPO method (V2O5 and H3PO4 refluxed in isobutanol) and (c) the VPD method (VOPO4. 2H(2)O refluxedin isobutanol), is readily converted to (VO)(2)P2O7 by heating in an inertgas at 750-775 degreesC. The three samples of (VO)(2)P2O7 have significantdifferences in the P-O-P stretch region of the Raman spectra and also exhibit marked differences in their reactivity with oxygen, although the powderX-ray diffraction patterns for the three samples are identical. The VPA-derived (VO)(2)P2O7 is readily oxidised at 400 degreesC, whereas the VPO-derived (VO)(2)P2O7 is particularly unreactive. The oxidation/reduction transformations are studied using in situ laser Raman spectroscopy and temperatureprogrammed oxidation and it is shown that the oxidation/reduction process can be cycled many times and the morphology of the crystallite remains unchanged.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 23:00:50