【摘要】 以硅酸钠为硅源,蔗糖为碳源,硫酸为催化剂,采用溶胶-凝胶法和碳热还原反应合成碳化硅(Si C),并用X射线粉末衍射(XRD)、N2吸附-脱附和场发射扫描电子显微镜(FESEM)等手段对产物进行表征。实验结果表明,碳化硅试样具有典型的介孔材料特征,改变硫酸与蔗糖添加量可以调控和优化产物结构;当反应物配比n(C):n(Si):n(S)=3.00:1:0.44时,可制得比表面积为235 m2·g-1、孔体积为0.46 cm3·g-1的碳化硅。更多还原

【Abstract】 Silicon carbide( Si C) with high surface area was prepared by a simple sol- gel process combined with carbothermal reduction method. This reaction involves the using of sodium silicate,sucrose and sulfuric acid as the silicon source,carbon source and catalyst respectively. The materials are characterized by X- ray powder diffraction( XRD),N2adsorption- desorption and field emission scanning electron microscope( FESEM). Studies here show that the as- prepared Si C samples are typical mesoporous materials and their textural properties can be effectively tuned and promoted by the simple controlling the adding amounts of sulfuric acid and sucrose. When the molar ratio of n( C) : n( Si) : n( S) is optimized and controlled as 3. 00: 1: 0. 44,tubular Si C with a high surface area of 235 m2·g- 1and pore volume of 0. 46 cm3·g- 1can be achieved.更多还原