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Titolo:
Solid-state NMR study of mesoporous phosphoro-vanado-aluminas
Autore:
Gougeon, RD; Bodart, PR; Harris, RK; Kolonia, DM; Petrakis, DE; Pomonis, PJ;
Indirizzi:
Univ Durham, Dept Chem, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE m, Dept Chem, Durham DH1 3LE, England Univ Ioannina, Dept Chem, GR-45332 Ioannina, Greece Univ Ioannina Ioannina Greece GR-45332 t Chem, GR-45332 Ioannina, Greece
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 22, volume: 2, anno: 2000,
pagine: 5286 - 5292
SICI:
1463-9076(2000)2:22<5286:SNSOMP>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-MAGNETIC-RESONANCE; HYDROTREATING CATALYST PRECURSORS; MOLECULAR-SIEVES; QUADRUPOLAR NUCLEI; MAS NMR; ALUMINOPHOSPHATES; ZEOLITE; TRIPLE; SPINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Harris, RK Univ Durham, Dept Chem, South Rd, Durham DH1 3LE, England Univ Durham South Rd Durham England DH1 3LE m DH1 3LE, England
Citazione:
R.D. Gougeon et al., "Solid-state NMR study of mesoporous phosphoro-vanado-aluminas", PHYS CHEM P, 2(22), 2000, pp. 5286-5292

Abstract

The structures of mesoporous solids of abbreviated formula Al100PxVy wherex, y=0, 5, 10 have been characterised by multinuclear magnetic resonance techniques. P-31 MAS spectra indicate that two phosphorus environments (threefold or fourfold O-Al coordination) are incorporated within the aluminium network. V-51 magic-angle spinning (MAS) spectra suggest that vanadium species are not (or only weakly) incorporated into the alumina network, formingV2O5-like and tetrahedral species at the surface of the pores. Al-27 MAS spectra show that amorphous AlPO4 species are formed upon addition of phosphorus, already occurring for the lower phosphorus input. However, Al-27 triple-quantum (3Q)-MAS cannot detect this amorphous AlPO4 phase, therefore indicating distorted environments close to the surface. For the Al100P10V10 sample, crystalline AlPO4 is detected. P-31-{Al-27} and P-31-{V-51} TRAPDOR experiments confirm that all the phosphorus atoms are surrounded by at leastthree aluminium atoms in the second coordination sphere, and suggest the heterogeneous location of vanadium species at the surface of the mesopores.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 09:56:37