CAJ | 학술논문

采用两步法将不同尺寸的silicalite-1分子筛纳米晶种通过自组装合成了一系列有序介孔silicalite-1分子筛。首先将强碱性的silicalite-1前驱体分别加热不同时间得到纳米晶种，然后在类似合成SBA-15的强酸性条件下组装成有序的介孔材料。合成条件的剧烈变化阻止了分子筛晶种的继续长大，并在三嵌段共聚物模板的诱导下组装成有序介孔材料。这种“自下而上”的方法制备有序介孔分子筛同时包含微孔和介孔。氮气吸脱附结果表明所制备的介孔分子筛材料均表现了很大的比表面积(730 m2/g以上)。
채용량보법장불동척촌적silicalite-1분자사납미정충통과자조장합성료일계렬유서개공silicalite-1분자사。수선장강감성적silicalite-1전구체분별가열불동시간득도납미정충，연후재유사합성SBA-15적강산성조건하조장성유서적개공재료。합성조건적극렬변화조지료분자사정충적계속장대，병재삼감단공취물모판적유도하조장성유서개공재료。저충“자하이상”적방법제비유서개공분자사동시포함미공화개공。담기흡탈부결과표명소제비적개공분자사재료균표현료흔대적비표면적(730 m2/g이상)。
A series of ordered mesoporous silicalite-1 zeolites has been synthesized by the self-assembly of nanosized zeolite silicalite-1 seeds with different sizes using a two-step procedure. The nanosized silicalite-1 seeds were prepared with an alkali precursor solution that was heated for different pe-riods, and then assembled into ordered mesoporous materials under strongly acidic conditions, similar to that of mesoporous silica SBA-15 which has well ordered hexagonal mesopores and amorphous walls. A significant change in synthesis conditions prevents the continued growth of zeolite seeds and induces assemblage into ordered mesoporous materials templated by triblock copolymers. The samples assembled by zeolite nanoclusters were investigated by X-ray diffraction, electron microscopy, infrared spectroscopy, and N2 adsorption-desorption isotherms. This “bot-tom-up”approach yields porous materials that contain ordered micro-and mesopores. The meso-porous zeolite has a large surface area (>730 m2/g).