| Summary: | 碩士 === 國立中央大學 === 化學工程學系 === 86 === A series of mesoporous vandosilicate V-MCM-41 molecular sieves
with variou Si/Vratios had been hydrothermally synthesized. The
chemical environment ,f vanadiumcenters in V-MCM-41 was
investigated by power X-ray diffraction (XRD), frameworkFTIR,
diffuse reflectance UV-visible spectroscopy (UV-vis), nitrogen
sorption measurement, scanning electron microscopy (SEM),
transmission electron microscopy (TEM) anddiffetent thermal
analysis (DTA). XRD and FTIR showed that the solid produts
havethe MCM-41 structe and contain only atomically dispered
vanadium consistent withframework vanadium consistent in V-
MCM-41. Nitrogen sorption results showed thatall of the
materials have a uniform pore size distribution with pore size
around3 nm. The crystallinity of V-MCM-41 decreased whed the
vanadium content was increased. The hexagonal array structure of
uniform pore size was observed by TEM. It wasproved that the
pores were highly aligned.The catalytic activity of V-MCM-41, V/
MCM-41(impergnation method), V-Y zeolite andV-Beata zeolite were
reacted in the partial oxidation of benzene by diluted
hydrogenperixide. All the products were analyzed by gas
chromatography (GC). Phenol wasthe only liquid product. The
catalytic activity of V-MCM-41 was better than thoseof V/MCM-41,
V-Y and V-Beata zeloites.
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