title: Characterization of V2O5-AlPO4 catalysts by 51V and 1H magic-angle spinning solid-state nuclear magnetic resonance spectroscopy.
abstract: Amorphous aluminum orthophosphate is used as a carrier for preparing a series of V2O5-AlPO4 catalysts with varying vanadia content. The catalysts were characterized by solid-state 51V and 1H magic-angle spinning nuclear magnetic resonance (MAS NMR), electron spin resonance (ESR) and X-ray diffraction (XRD). The XRD patterns of the catalysts remained amorphous at all loadings studied. 51V Solid-state NMR spectra revealed the presence of V2O5 microcrystallites at higher vanadia loadings. The 1H MAS NMR spectra of the catalysts showed a maximum consumption of support hydroxyl groups at 6 wt.-% V2O5 indicating the completion of a monolayer at this composition.
authors.affiliation: Physical and Inorganic Chemistry Division, Indian Institute of Chemical Technology, Hyderabad.
authors.forename: L J
authors.initials: LJ
authors.lastname: Lakshmi
authors.forename: S T
authors.initials: ST
authors.lastname: Srinivas
authors.forename: P K
authors.initials: PK
authors.lastname: Rao
authors.forename: A V
authors.initials: AV
authors.lastname: Nosov
authors.forename: O B
authors.initials: OB
authors.lastname: Lapina
authors.forename: V M
authors.initials: VM
authors.lastname: Mastikhin
mesh_terms: D017607:Aluminum Compounds; D006859:Hydrogen; D009682:Magnetic Resonance Spectroscopy; D010710:Phosphates; D014639:Vanadium; D017968:Vanadium Compounds
chemical_list: D017607:Aluminum Compounds; D010710:Phosphates; D017968:Vanadium Compounds; D014639:Vanadium; D006859:Hydrogen; C066075:vanadium pentoxide; C012714:aluminum phosphate