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Titolo:
OBSERVATION OF [AL(OH)N(H2O)6-N]N(MOO4) IN HYDROTREATING CATALYST PRECURSORS BY SOLID-STATE AL-27 NMR
Autore:
EDWARDS JC; DECANIO EC;
Indirizzi:
TEXACO USA INC,RES CTR,POB 509 BEACON NY 12508
Titolo Testata:
Catalysis letters
fascicolo: 2-3, volume: 19, anno: 1993,
pagine: 121 - 130
SICI:
1011-372X(1993)19:2-3<121:OO[IHC>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLYBDENA ALUMINA CATALYSTS; SPECTROSCOPY; CHEMISTRY; RAMAN; NO;
Keywords:
SOLID-STATE AL-27 NMR; CROSS-POLARIZATION; HYDROTREATING CATALYST PRECURSORS; HYDRATED ALUMINUM MOLYBDATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
J.C. Edwards e E.C. Decanio, "OBSERVATION OF [AL(OH)N(H2O)6-N]N(MOO4) IN HYDROTREATING CATALYST PRECURSORS BY SOLID-STATE AL-27 NMR", Catalysis letters, 19(2-3), 1993, pp. 121-130

Abstract

A previously unobserved octahedral Al-27 MAS NMR resonance has been detected in rehydrated calcined Mo/Al2O3 hydrotreating catalyst precursors. This resonance is attributed to the presence of hydrated forms ofaluminum molybdate such as [Al(OH)n(H2O)6-n]n(MoO4) (n = 1 or 2). Thecross-polarization relaxation parameters, obtained from variable contact time experiments, yielded information on the relative sizes of the[Al(OH)n(H2O)6-n]n(MoO4) domains in the catalysts with different molybdenum loadings. Analysis of the Al-27 MAS NMR spectra of P-Mo(8)/Al2O3 and P-Mo(12)/Al2O3 (Wt% P = 0.0-12.0) shows that a function of the phosphate in the 12 wt% Mo catalyst is to prevent the re-hydration of the molybdate phases on the calcined catalysts.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 10:50:10