Hydrothermal synthesis and characterisation of two novel large-pore framework vanadium silicates

authors	Brandao, P; Valente, A; Philippou, A; Ferreira, A; Anderson, MW; Rocha, J
nationality	International
journal	EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords	microporous materials; silicates; vanadium; catalysis; hydrothermal synthesis
keywords	MESOPOROUS MOLECULAR-SIEVES; OXIDE CATALYSTS; SPECTROSCOPY; REACTIVITY; OXIDATION; ETHANOL
abstract	Two new large-pore sodium vanadium silicates, denoted AM-15 and AM-17 (Aveiro-Manchester, structures number 15 and 17) with framework composition Na6Si14V4O39 and Na4CaSi10V2O27, respectively, are reported. Electron paramagnetic resonance (EPR), Fourier transform infrared (FTIR) and diffuse reflectance ultraviolet-visible (DR UV/Vis) spectroscopy reveal that as-prepared AM-15 contains both V-IV and V-V in a square pyramidal and tetrahedral coordination, respectively, while AM-17 contains predominantly octahedral V-IV The thermal stability of AM-15 in air is modest (ca. 380 degreesC), while AM-17 is stable up to 450 degreesC. The acid-base and redox properties of AM-17 have been assessed by the conversion of isopropanol and ethanol oxidation, respectively. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).
publisher	WILEY-V C H VERLAG GMBH
issn	1434-1948
year published	2003
issue	6
beginning page	1175
ending page	1180
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000181813000017