摘 要:氣凝膠是一種由納米粒子相互聚結構成的多孔性固態材料，具有密度低，孔隙率高，孔分布均勻，透光性能好等優點。因而在超低密度耐高溫材料，高效高能電極，聲阻抗耦合材料，高效催化劑及其載體，吸附劑等方面具有非常廣闊的應用前景。

　　　本文以正硅酸乙醋(TEOS)為原料，采用溶膠——凝膠(Sol-Gel)法制備了SiO2小球，將所得的濕凝膠經非超臨界干燥技術，最終得到氣凝膠小球。兩種方法制得的氣凝膠小球均為表面光滑的乳白色輕質固體，大小均勻，直徑分別可控制在300-700nm的微球和1-5mm之間的小球，非超臨界干燥工藝其直徑的收縮率可穩定在30%左右。

　　　此外本文在成功制備出SiO2 氣凝膠小球的基礎上通過通過溶膠——凝膠技術和非超臨界干燥技術又成功的制備出了TiO2 ---- SiO2  氣凝膠小球。并把制得的TiO2 ---- SiO2  二元氣凝膠小球用于酯化反應中，實現了復合二元氣凝膠的小球的催化作用。

關鍵詞：TiO2 ---- SiO2  二元氣凝膠小球 溶膠-凝膠 烴氨法 酯化反應 催化

Abstract:The airgel is a nanoparticles mutual polyethylene structure into the porous solid material having a low density, high porosity, uniform pore size distribution, good light transmission properties, etc.. Thus in ultra-low-density high-temperature materials, energy efficient, electrodes, acoustic impedance coupling materials, efficient catalyst and its carrier, adsorbent has a very broad application prospects.

　　　In this paper, the positive silicic acid ethyl ester (TEOS) as raw materials by sol - gel (Sol-Gel) the prepared SiO2 ball, the wet gel obtained by supercritical drying, the resulting airgelball. The airgel obtained pellets of the two methods are the smooth surface of the milky white light solid, uniform size, diameter, respectively, can be controlled in the 300-700nm microspheres and 1-5mm between the small balls, non-supercritical drying process the shrinkage of its diameter can be stabilized at about 30%.

　　　Addition, by in SiO2 airgel ball successfully prepared based on sol - gel technology and non-supercritical drying technology successfully prepared silica airgel TiO2 ---- ball. The prepared TiO2 ---- SiO2 binary airgel pellets used in the esterification reaction, the catalytic composite binary airgel ball.

Keywords: TiO2—SiO2 binary airgel ball  sol - gel hydrocarbons ammonia catalyzed esterification reacti