介孔材料
沸石
材料科学
硅酸铝
结晶
化学工程
介孔有机硅
无定形固体
分子筛
水热合成
透射电子显微镜
扫描电子显微镜
热液循环
催化作用
纳米技术
介孔二氧化硅
有机化学
化学
复合材料
工程类
作者
Minkee Choi,Hae Sung Cho,Ruchi Srivastava,C. Venkatesan,Dae‐Heung Choi,Ryong Ryoo
出处
期刊:Nature Materials
[Springer Nature]
日期:2006-08-06
卷期号:5 (9): 718-723
被引量:1105
摘要
Zeolites are a family of crystalline aluminosilicate materials widely used as shape-selective catalysts, ion exchange materials, and adsorbents for organic compounds. In the present work, zeolites were synthesized by adding a rationally designed amphiphilic organosilane surfactant to conventional alkaline zeolite synthesis mixtures. The zeolite products were characterized by a complementary combination of X-ray diffraction (XRD), nitrogen sorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The analyses show that the present method is suitable as a direct synthesis route to highly mesoporous zeolites. The mesopore diameters could be uniformly tailored, similar to ordered mesoporous silica with amorphous frameworks. The mesoporous zeolite exhibited a narrow, small-angle XRD peak, which is characteristic of the short-range correlation between mesopores, similar to disordered wormhole-like mesoporous materials. The XRD patterns and electron micrographs of the samples taken during crystallization clearly showed the evolution of the mesoporous structure concomitantly to the crystallization of zeolite frameworks. The synthesis of the crystalline aluminosilicate materials with tunable mesoporosity and strong acidity has potentially important technological implications for catalytic reactions of large molecules, whereas conventional mesoporous materials lack hydrothermal stability and acidity.
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