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化学学报
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化学学报 ›› 1988, Vol. 46 ›› Issue (9): 862-867. 上一篇    下一篇

研究论文

三氧化钼-二氧化硅的制备方法与表面结构、表面酸性的关系

赵壁英;刘慧珠;桂琳琳;唐有祺   

  1. 北京大学物理化学研究所
  • 发布日期:1988-09-15

Relation between the preparation methods of molybdenum trioxide - silicon oxide and their surface stucture and surface acidity

ZHAO BIYING;LIU HUIZHU;GUI LINLIN;TANG YOUQI   

  • Published:1988-09-15

PDF

465

被引次数

10

用共沉淀法和浸渍法制备样品. 测定了样品的表面酸性. 通过XRD, XPS、IR和激光喇曼光谱测定了样品的结构、MoO3的表面浓度和酸位类型. 结果表明, 两系列样品的表面结构、酸性变化的规律、MoO3的表面化学状态都与制备方法密切相关.在用共沉淀法制备的样品中, MoO3以两种不同的化学形态存在在表面上, 它们对表面酸性的影响然不同.

关键词: Ｘ射线衍射分析, 氧化硅, 表面结构, 表面化学, 酸度, 氧化钼, 共沉淀, 浸渍法, 激光, 拉曼光谱法

Two series of samples were prepared by the copptn. and the impregnation methods. The surface acidity of these samples was determine The structure, surface concentration of MoO3, and the types of surface acidic sites were measured by XPS, x-ray diffraction, IR, and laser Raman spectroscopy. For these 2 series of samples, the surface structure, the trend of the change of surface acidity, and the surface chem. state of MoO3 remarkably depend on the preparation method. For the samples obtained by copptn., MoO3 exists on the surface in 2 different chem. states which have completely opposite effects on the surface acidity.

Key words: X-RAY DIFFRACTION ANALYSIS, SILICON OXIDE, SURFACE STRUCTURE, SURFACE CHEMISTRY, ACIDITY, MOLYBDENUM OXIDE, COPRECIPITATION, DIPPING, LASER, RAMAN SPECTROMETRY

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