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- W2013661243 abstract "Microporous vanadium aluminosilicate with BEA structure was synthesized in a Na2O: SiO2: V2O5: Al2O3: N(C2H5)4OH: H2O system. A kinetic study of the crystallization of V-Al-Beta reveals that there seem to exist optimum ranges of the Al2O3/SiO2 and V2O5/SiO2 ratio, out of which either the crystallinity is extremely low or other phases occur. The V incorporation in the framework is confirmed by i.r., e.s.r., and 51V n.m.r. spectra, e.s.r. and n.m.r. spectra show that vanadium, both in the as-synthesized and calcined samples, is in an atomically dispersed state and that the clusters of vanadium as well as V2O5-like phases are absent. Part of the V species is easily oxidable, and the other part remains in the V4+ states on calcining in air, possibly due to the effect of the strong Brønsted acid sites in the V-Al-Beta. In the hydroxylation of phenol with diluted H2O2 aqueous, V-Al-Beta exhibits quite high catalytic activity and selectivity." @default.
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- W2013661243 date "1997-05-01" @default.
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- W2013661243 title "Synthesis and characterization of large pore vanadium aluminosilicate beta molecular sieves" @default.
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- W2013661243 doi "https://doi.org/10.1016/s0144-2449(97)00003-1" @default.
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