【摘 要】
：
The new V-MCM-41 molecular sieves with good ordered hexagonal mesoporous structure and crystallinity were synthesized through in-situ hydrothermal preparation method.The effects of the crystallization time were discussed.The synthesized samples were chara
【机 构】
：
College of Chemistry & Chemical Engineering,Chongqing University of Technology,Chongqing 400054,Chin
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The new V-MCM-41 molecular sieves with good ordered hexagonal mesoporous structure and crystallinity were synthesized through in-situ hydrothermal preparation method.The effects of the crystallization time were discussed.The synthesized samples were characterized by X-ray diffraction,N2 adsorption/desorption,Fourier transformed infrared and scanning electron microscopy.The different structures,textures,morphologies of V-MCM-41 obtained with different crystallization times were observed and analyzed on the basis of the characterized results.The results showed that the V-MCM-41 molecular sieve obtained at 110 ℃ for 48 h crystallization times was of good spherical morphology,ordered hexagonal structure,most uniform pore size distribution and high surface area compared with other samples.Meanwhile,the V-MCM-41 molecular sieve with the high skeleton Si condensation and the good crystallinity was obtained.The heteroatom could be incorporated into MCM-41 framework with increasing crystallization times,which was beneficial to improve the catalytic activity and selectivity of pure siliceous MCM-41.The V-MCM-41 showed the good catalytic selectivity in catalytic oxidation of styrene using hydrogen peroxide,and the selectivity of the benzaldehyde and phenylacetic acid reached 30.68％ and 49.44％,respectively.
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