酸性条件下并流混合法制备介孔二氧化硅

Preparation of Mesoporous Silica by Mixing Method under Acidic Conditions

以硅酸钠(Na_2O·3.27SiO_2)和硫酸为原料,酸性条件下,采用并流混合法制备介孔二氧化硅。考察老化搅拌时间,静置陈化时间,表面活性剂种类等条件对制备粉体的影响,以视比容值,吸油值,XRD,BET,SEM,TEM等方法对粉体进行表征。结果表明,最佳条件制备的介孔二氧化硅,粉体形貌均匀,分散度较好;粉体与以往同类产品相比,有较大的比表面积和孔容,为工业的扩大生产和应用提供了基础。经表征,粉体比表面积577.022 m^2/g,孔容1.728 cm^3/g,平均孔径18.585 nm。

Mesoporous silica was prepared by mixing method and under acidic condition with sodium silicate （ Na2O· 3.27SiO2 ） and sulfuric acid as raw materials. The basic performance of SiO2 powder was characterized by means of powder value, oil absorption value, XRD, BET, SEM and TEM. The effects of several technical factors, such as aging time, assembly time and the type of surfactants, on the silica powder were studied. The results showed that the preparation of mesoporous silica powder prepared under the optimum experimental conditions, the morphology of the powder particles were spherical or ellipsoidal, most type, a better dispersion of powder products and the preparation of mesoporous silica under acidic conditions by comparison, the performance was greatly improved, and for a good role in promoting industrial production. The surface area was 577.022 m^2/g, pore volume was 1. 728 cm^3/g and the average pore size was 18. 585 nm.