多级孔无铝Beta分子筛的合成与表征

研究了氟介质条件下,合成参数对前驱体黏度和无铝Beta分子筛晶化过程的影响.X射线衍射结果表明,高水硅比可降低前驱体的黏度,但抑制分子筛的晶化.当合成体系中加入成核促进剂(二氧化锗)和晶化促进剂(高氯酸根或磷酸根)后,即使水硅摩尔比高达20~30,在150℃水热合成4 d,仍可获得高结晶性、微米级球形或多面体形无铝Beta分子筛.热重和能谱分析结果表明,极少量高氯酸根和磷酸根可进入分子筛孔道,并影响模板剂四乙基铵根离子的热分解过程.氮气吸附-脱附、扫描电子显微镜、透射电子显微镜和选区电子衍射分析结果表明,所得无铝Beta分子筛具有多级孔结构,介孔尺寸在3.4~3.8 nm之间,由纳米晶体或纳米棒堆积而成.

Synthesis and Characterization of Hierarchical Aluminum Free Beta Zeolite

The influence of various parameters upon the physical state of precursor and crystallization of aluminum-free Beta zeolite were investigated in fluoride media. X-Ray diffraction(XRD) analysis showed that H2O/SiO2 molar ratio in the precursor played an important role in the viscosity of precursor and the crystallization of aluminum-free Beta zeolite. High H2O/SiO2 molar ratio(>10) was benefited to the precursor's viscosity but inhibited the crystallization process of aluminum-free Beta zeolite. While, high crystalline aluminum-free Beta zeolite with polyhedron or sphere morphology in micrometer scale could be obtained in the presence of nucleation promoter(GeO2) and crystallization promoter such as ClO4- and PO43- at 150 ℃ for 4 d, even though H2O/SiO2 molar ratio was high to 20-30. The analysis of thermogravimetry and energy dispersive spectrometry proved that small amount of ClO4- and PO43- maybe incorporated into the channel of Beta zeolite and influenced the thermal decomposition process of template(tetraethyl ammonium cation). Further characterization for the morphology, crystalline and pore structure of the resultant aluminu-free Beta zeolite were carried out by environmental scanning electron microscope(SEM), transmission electron microscope(TEM), selected-area electron diffraction(SAED) and nitrogen adsorption-desorption isotherm. The results indicate that the obtained aluminum-free Beta zeolite is hierarchical structure, which constructed by nanoparticles or nanosheets. The mesoporous pore size is in the range of 3.4—3.8 nm.