Y/SBA-15的微波水热法合成及其表征分析

研究了微波水热法合成微孔-介孔复合分子筛Y/SBA-15,以XRD为表征手段,考察了pH、二氧化硅与P123物质的量比、微波功率、搅拌速度和晶化温度等因素对复合分子筛结构的影响.经过研究确定了复合分子筛的合成条件:pH值为2.5,SiO2和P123物质的量比为58,微波功率为200W,搅拌速度为250r/min,晶化温度为120℃.采用氮气吸附脱附、透射电镜等分析方法对复合分子筛进行了表征分析,结果表明:合成产物同时具有微孔介孔结构特征,结晶度良好、短棒状大小均匀,微孔、介孔2种孔径分布均匀,平均孔径为4.050 13nm,孔壁厚度为2.2nm,BET孔容为0.350 525cm3/g.

Microwave Hydrothermal Synthesis and Characterization of Y/SBA-15

A microwave radiation hydrothermal method to control synthesis of micro-and mesoporous Y/SBA-15 composite molecular sieves was reported. The effects of pH， molar ratio of silica and P123， microwave power， stirring speed， and crystallization temperature on the growth of Y/SBA-15 were observed by X-ray diffraction(XRD). The composite zeolite synthesis conditions were identified:the pH value was 2.5， the molar ratio of silica and P123 was 58， the microwave power was 200W， the stirring speed was 250r/min， and the crystallization temperature was 120℃. The synthesized samples were characterized by N₂ adsorption-desorption and TEM. The results showed that synthetic products with regular crystallinity of short rod of uniform size show the microporous and the mesoporous structures at the same time. Pore size distribution of microporous and mesoporous structures is uniform. The adsorption study indicated that Y/SBA-15 has the average pore diameter of 4.05013nm， the pore volume of 0.350525cm³/g， and the hole wall thickness of 2.2nm， respectively.