作　　者： ; ; ; ; ;

机构地区： 湖南大学材料科学与工程学院

出　　处： 《中国陶瓷》 2005年第2期21-24,共4页

摘　　要： 采用原位掺入法合成出CeO2-Al2O3/SiO2超微孔材料,并采用XRD、N2吸附、TG-DSC和FT-IR等手段对合成样品进行了结构和物性表征。结果表明,合成样品在2θ为2.90处出现特征衍射峰,其d100值为3.05nm;样品经沸水处理48h后孔结构仍保持完好。低温N2吸附等温线属于LangmuirⅠ型,BET比表面积为635.6m2/g。在493.9K,730.6K和829K左右出现的放热峰分别是由模板剂分解,Ce3+发生氧化反应及Al2O3的相变引起的。 In this paper, ceria and alumina doped into silica microporous materials were synthesized by in- situ incorporation ,using dodecylamine as template. The structures and surface adsorption properties of the sample were investigated by means of XRD, Nitrogen isothermal adsorption, TG-DSC analysis and FT-IR, etc. The results of XRD show that the calcined samples have a single diffraction peak at 2θ to 2.90 , corresponding to interplanar spacing is 3.05nm. The sample prepared exhibits high hydrothermal stability, its microporous structure could be maintained after hydrothermal treatment for 48 hours in boiling water. Nitrogen adsorption isotherm plot of the sample recorded belongs to LangmuirⅠwith specific surface area of 570.3m2/g. In the DSC curve, the exothermic peak is caused by decomposing the template in 493.9K In addition, the exothermic peak in the temperature between 713K and 753K is formed because Ce3+ is oxidized into Ce4+ and that in829K may relate with phase transformation of alumina.

关 键 词： 超微孔 表面特性 水热稳定性 表征

领　　域： [化学工程] [化学工程]