Abstract

Mesoporous titanosilicate structures synthesized by the sol–gel method using the cetylpyridinium template at different Ti/Si ratios are characterized by high specific surface areas A_BET ≈ 800 m²/g and A_ext ≈ 900–1000 m²/g, as well as the shape of the isotherms of physical nitrogen adsorption characteristic of the mesoporous molecular sieve MCM-41 with an adsorption branch rising and a section of reversible capillary condensation at a relative pressure of 0.21 < p/p₀ < 0.42. An increase in the Ti/Si ratio and pH values leads to a decrease in the dispersion and surface area of the samples. FTIR spectra confirm the presence of titanium(IV) in the silicate framework. The incorporation of titanium(IV) affects the morphology of titanosilicate samples and reduces the ordering of cylindrical mesopores characteristic of MCM-41.

中文翻译：

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纳米氮钛硅酸盐的合成及其物理氮吸附的结构表征

摘要

通过使用在不同的Ti / Si的比的氯化十六烷基吡啶模板溶胶-凝胶法合成孔性钛硅酸盐的结构的特征在于高比表面积甲_BET ≈800米² / g，且甲_分机≈900-1000米² /克，以及介孔分子筛MCM-41的物理氮吸附等温线的形状，在0.21 < p / p ₀的相对压力下，具有吸附支链上升和可逆的毛细管冷凝段<0.42。Ti / Si比和pH值的增加导致样品的分散性和表面积降低。FTIR光谱证实了硅酸盐骨架中钛（IV）的存在。钛（IV）的掺入会影响钛硅酸盐样品的形貌，并降低MCM-41特征的圆柱形中孔的有序性。