氨或铵盐在制备双峰孔分布硅胶中的应用

Application of ammonia or ammonium salt in the preparation of bimodal pore radius distribution silica gel

关键词:  氨或铵盐  硅胶  孔分布  双峰

Key words:  ammonia or ammonium salt  silica gel  pore distribution  bimodal

摘要:

采用氨或铵盐对双峰孔分布的硅胶孔结构进行改变,获得双峰孔分布的大孔硅胶产品。考察氨或铵盐的加入与否、添加量、添加时段及添加氨或铵盐时的反应温度对双峰孔分布硅胶的性能影响。实验结果表明,在反应初期添加氨或铵盐,与无机酸形成的酸式盐/无机酸摩尔比为3∶1,反应温度为30℃,可获得孔容1.65cm3/g,孔径20.00nm,比表面积340m2/g的双峰孔分布的大孔硅胶产品。

Abstract:

Changing the silica gel pore structure with bimodal pore radius distribution by using ammonia or ammonium salt,the macroporous silica gel products with bimodal pore radius distribution can be gained.Whether to adding ammonia or ammonium salt or not,the amount of ammonia or ammonium salt,different adding time and reaction temperature to affect silica gel performance were investigated in this paper.The results showed that when adding ammonia or ammonium salt to the solution in the initial stage,ammonia or ammonium salt reacted with inorganic acid,formed acid salt/inorganic acid(molar ratio) = 3∶1,reaction temperature was 30 ℃,the macroporous silica gel product with bimodal pore distribution can be obtained,the pore volume was 1.65 cm3/g,pore radius was 20.00 nm and specific surface area was 340 m2/g.