MCM-41介孔分子筛结构的XRD表征

Synthesis of silica mesoporous molecular sieve MCM-41

在碱性条件下 ,采用水热晶化法 ,以水玻璃为硅源 ,表面活性剂十六烷基三甲基溴化铵为结构模板剂 ,成功合成出MCM 41介孔分子筛。采用XRD表征手段研究了合成条件(pH值 )、凝胶配比 (表面活性剂 /SiO2 、H2 O/SiO2 )和凝胶后处理条件 (老化时间、晶化时间和焙烧温度 )对MCM

In the basic conditions, the synthesis of mesoporous molecular sieve MCM\|41 has been accomplished successfully in a hydrothermal system using sodium silicate as silicate and surfactant C\-\{16\}H\-\{33\}(CH\-3)\-3NBr as structural template. The technique of X-Ray Diffraction was used to identify the effect of the synthesis conditions(pH), the composition of gel(Surfactant/SiO\-2,H\-2O/SiO\-2) and conditions treating gel (aging time, crystallizing time, calcined temperature)on the crystal structure of MCM\|41. The results show that the synthesis conditions of mesoporous molecular sieve MCM\|41are pH10.5～12.5, surfactant/SiO\-2 0.05-0.7, H\-2O/SiO\-240～200, preferably longer aging time was better, 24\|hours crystallizing time, calcined temperature 540～740 ℃。