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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (4): 323-328. 上一篇    下一篇

研究论文

Cr或V掺杂的HMS在甲酸溶液中的光催化产氢性能研究

师进文, 郭烈锦*   

  1. (西安交通大学动力工程多相流国家重点实验室 西安 710049)
  • 投稿日期:2006-08-22 修回日期:2006-09-29 发布日期:2007-02-28
  • 通讯作者: 郭烈锦

Photocatalytic Performance of HMS Doped with Chromium or Vana-dium for Hydrogen Production in Aqueous Formic Acid Solution

SHI Jin-Wen; GUO Lie-Jin*   

  1. (State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049)
  • Received:2006-08-22 Revised:2006-09-29 Published:2007-02-28
  • Contact: GUO Lie-Jin

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本文以过渡金属离子M(M代表Cr或V)掺杂为改性手段，通过改变掺杂量，合成了一系列分子筛光催化剂M(x)-HMS(x代表M/Si摩尔投料比)。用X-射线荧光光谱(XRF)、低温 N2 吸附-脱附、X-射线衍射(XRD)和紫外-可见吸收漫反射光谱(UV-vis)对M(x)-HMS进行了表征和分析。以高压汞灯为光源，以甲酸分解产氢为探针反应，研究了M(x)-HMS的光催化性能，发现Cr(x)-HMS和V(x)-HMS的产氢速率随组成变化呈双峰规律(均在x＝0.01和0.05时出现两个极大值)，并从光催化剂的组成和结构角度给予了解释。以过渡金属离子M (M代表Cr或V)掺杂为改性手段, 通过改变掺杂量, 合成了一系列分子筛光催化剂M(x)-HMS (x代表M/Si投料摩尔比). 用X射线荧光光谱(XRF)、低温N2吸附-脱附、X射线衍射(XRD)、紫外-可见吸收漫反射光谱(UV-vis)、高分辨透射电子显微镜(HRTEM)和X射线能量散射谱(EDXS)对M(x)-HMS进行了表征和分析. 以高压汞灯为光源, 以甲酸分解产氢为探针反应, 研究了M(x)-HMS的光催化性能, 发现Cr(x)-HMS和V(x)-HMS的产氢速率随组成变化呈双峰规律(均在x＝0.01和0.05时出现两个极大值), 并从光催化剂的组成和结构角度给予了解释.

关键词: 介孔分子筛, HMS, 光催化, 甲酸, 产氢

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 characterized and analyzed by X-ray fluorescence spectroscopy (XRF), N2 adsorption-desorption isotherms, X-ray diffraction patterns (XRD), ultraviolet-visible diffuse reflectance spectra (UV-vis), high-resolution transmission 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.

Key words: mesoporous molecular sieve, HMS, photocatalysis, formic acid, hydrogen production