【作者】 安群力；

【导师】 王水利；

【作者基本信息】 西安科技大学 ， 矿物加工工程， 2005， 硕士

【摘要】 介孔分子筛 MCM-41 具有比表面积高、孔道结构规则及孔径易调节、化学稳定性和热稳定性好、表面易改性等优点,在催化化学和吸附分离等领域都有很大的潜在应用前景. 本论文考察了 MCM-41 介孔分子筛合成过程中的一些主要影响因素如模板剂与硅源摩尔比、水与硅源的摩尔比、pH 值、晶化温度、晶化时间对合成的影响。并通过水热合成法在碱性条件下合成了结晶度较好,孔道排列有序度高的介孔分子筛 MCM-41,所用的模板剂为十六烷基三甲基溴化铵(CTMABr),硅源为无机的工业级水玻璃,原料的配比为 SiO2∶Na2O∶CTMABr∶H2O=1∶0.5∶0.3∶100,合成时的 pH 值为 10.5、晶化温度为 120℃、晶化时间为 48h。通过 X 射线衍射(XRD)、傅立叶转换光谱(FT-IR)、扫描电镜(SEM)、热重及低温氮气吸附-脱附试验等测试方法对样品进行了表征,表明该条件所合成的样品具有规整有序的六方介孔孔道,较大的比表面积(1207m2/g)和比孔容(1.03cm3/g),孔径大小分布窄(2～3nm),为高质量的 MCM-41 介孔分子筛。 以所合成的 MCM-41 介孔分子筛为吸附剂,对一种有代表性的有机物亚甲基兰进行了吸附研究,发现这种材料对亚甲基兰稀溶液在 30 分钟就有高达 97%以上的吸附率,饱和吸附量为 124mg/g。更多还原

【Abstract】 With high specific surface area, ordered pore structure, facilely tailorable pore size, and fine chemical stability and thermostability, Mesoporous molecular sieve MCM-41 has wide application prospects in many fields, such as catalyst chemistry, adsorption and separation. In this thesis, the key factors in the synthesis of mesoporous molecular sieve MCM-41 including the molar ratio of surfactant and water to silica, pH value, crystallizating temperature and time, were investigated separately. And mesoporous molecular sieve MCM-41, with good crystallization degree and regular pore channels was synthesized through hydrothermal treatment in alkaline medium by using cetyltrimethylammonium bromide as template, sodium silicate solution as inorganic silica source. It was shown that when the molar ratio of the reaction mixture reached to 1SiO2∶0.5Na2O∶0.3CTMABr∶100H2O, after crystallizating at 120℃ for 48 hours, MCM-41 with best quality could be gotten. Then the materials were characterized by XRD, FT-IR, SEM, thermogravimetric analysis, and N2 adsorption-desorption experiments. It turned out the sample possessed ordered hexagonal mesoporous channels, high specific surface area of 1207 m2/g, high specific pore volume of 1.03 cm3/g and narrow pore distribution between 2~3nm. Using the MCM-41 molecular sieve as adsorbents to adsorb methylene blue solution, it indicated that the material had a 97% removal ratio to methylene blue in just 30 minutes and an adsorbed amount of 124mg/g.更多还原