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Study on adsorption and reaction mechanism of preparation of TiO2/SiO2 by adsorption phase reactor technique

机译：吸附相反应器技术制备TiO2 / SiO2的吸附及反应机理研究

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This paper approaches the evolution of adsorption layer with temperature under different water concentrations. EDX and X-ray diffraction (XRD) indicated that under low water concentration (LWC), there was a sharp decrease in TiO2 quantity curve and grain size curve between 40 degrees C and 60 degrees C. But under high water concentration (HWC), TiO2 quantity and grain size both rose continually. In transmission electron microscopy (TEM) picture, the characteristic of samples of LWC and HWC at low temperature were similar, whereas they became quite different at high temperature. These phenomena manifest that the effects of adsorption and reaction alter at different conditions. Under LWC, adsorption mechanism dominates the process. Under HWC, the chief mechanism at low temperature was similar to that of LWC and at high temperature the major reaction region switches from adsorption to alcohol bulk. Based on the characteristics of adsorption on silica surface, the phenomenology theory dealt with formation of adsorption layer and its evolution with temperature was proposed. (c) 2005 Elsevier B.V. All rights reserved.
机译：本文研究了不同水浓度下吸附层随温度的变化。 EDX和X射线衍射（XRD）表明，在低水浓度（LWC）下，40°C至60°C之间的TiO2量曲线和粒度曲线急剧下降。但是在高水浓度（HWC）下， TiO2的数量和晶粒尺寸均持续增长。在透射电子显微镜（TEM）图片中，低温下LWC和HWC样品的特性相似，而在高温下它们的特性却大不相同。这些现象表明，吸附和反应的效果在不同条件下会发生变化。在LWC的作用下，吸附机制起主导作用。在HWC下，低温下的主要机理与LWC相似，而在高温下，主要的反应区域从吸附转变为醇类。根据吸附在二氧化硅表面的特性，提出了有关吸附层形成及其随温度变化的现象学理论。 （c）2005 Elsevier B.V.保留所有权利。

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