| WO_3在气相吸附法制备的TiO_2/SiO_2复合载体表面的分散状态 |
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| 引用本文： | 邓存.WO_3在气相吸附法制备的TiO_2/SiO_2复合载体表面的分散状态[J].天然气化工,2006,31(1):15-20. |
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| 作者姓名： | 邓存 |
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| 作者单位： | 宁德师范高等专科学校化学系,福建宁德,352100 |
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| 摘 要： | 采用气相流动吸附法制备了TiO2/SiO2复合载体,用浸渍法制备了WO3/(TiO2/SiO2)催化剂,应用XRD和LRS等技术研究了TiO2在SiO2表面及WO3在TiO2/SiO2复合载体表面上的分散状态。结果表明,TiO2在复合载体中的载量低于其分散阈值时,它在SiO2表面呈单层但非密置单层分散;WO3在催化剂中的载量低于其分散阈值时,它在复合载体表面亦呈单层但非密置单层分散。TiO2在SiO2表面上的分散可改善WO3的分散状态,提高WO3在SiO2表面上的分散阈值。
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| 关 键 词： | 气相吸附法 TiO2/SiO2复合载体 单层分散 WO3(TiO2/SiO2)催化剂 X-射线衍射分析 激光喇曼光谱 |
| 文章编号： | 1001-9219（2006）01-15-05 |
| 收稿时间： | 2005-03-26 |
Dispersion of WO 3 on Surface of TiO 2/SiO 2 Complex Support Prepared by Using a Gas-Flow Adsorption |
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| DENG Cun.Dispersion of WO 3 on Surface of TiO 2/SiO 2 Complex Support Prepared by Using a Gas-Flow Adsorption[J].Natural Gas Chemical Industry,2006,31(1):15-20. |
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| Authors: | DENG Cun |
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| Affiliation: | Department of Chemistry, Ningde Teachers College, Ningde 352100, China |
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| Abstract: | A TiO_2/SiO_2 complex support was prepared by using a gas-flow continuum adsorption method.WO_3/(TiO_2/SiO_2) catalysts were made by impregnating the complex support with a ammonium metatungstate solution.XRD and LRS techniques were employed in examining the dispersion of TiO_2 on the surface of SiO_2 and that of WO_3 on the surface of the complex support.The data collected suggest that when the TiO_2 content is less than the threshold of TiO_2 dispersed on the surface of SiO_2,it forms a monolayer,but not a close-packed monolayer distribution.WO_3 shows a similar behavior on the surface of TiO_2/SiO_2 complex support.The presence of TiO_2 on the surface of SiO_2 enhances the dispersion of WO_3 on SiO_2 surface. |
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| Keywords: | gas phase adsorption method TiO_2/SiO_2 complex support monolayer dispersion WO_3/(TiO_2/SiO_2) catalyst X–ray diffraction analysis Laser Raman spectroscopy |
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