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《Acta Chimica Sinica》 2007-04
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Photocatalytic Performance of HMS Doped with Chromium or Vanadium for Hydrogen Production in Aqueous Formic Acid Solution

SHI,Jin-Wen GUO,Lie-Jin~* (State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049)  
A series of transition metal doped photocatalysts,denoted as M(x)-HMS (here,M represents Cr or V,x represents the molar ratio of M/Si in the feed reagents and HMS represents hexagonal mesoporous silica molecular sieves),were synthesized by adjusting the value of x.The HMS materials were character- ized and analyzed by X-ray fluorescence spectroscopy (XRF),N_2 adsorption-desorption isotherms,X-ray diffraction patterns (XRD),ultraviolet-visible diffuse reflectance spectra (UV-vis),high-resolution transmis- sion electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDXS).The photocatalytic activity was investigated using high pressure mercury lamp as the light source and the decomposition of formic acid to produce hydrogen as probe-reaction.Interestingly,the rate of hydrogen production for both Cr(x)-HMS and V(x)-HMS shows bimodal character which coincidentally corresponds to the x value of 0.01 and 0.05,and it was interpreted in terms of the components and structures of M(x)-HMS.
【Fund】: 国家重点基础研究发展规划(No.2003CB214500);; 国家自然科学基金(No.50521604)资助项目.
【CateGory Index】: O644.1;TQ116.2
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