Microwave synthesis and characterization of three-dimensional SBA-16 and nano-scale nanoporous molecular sieves

• Main Authors: Li-Li Wu, 吳莉莉
• Other Authors: Chi-Feng Cheng
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/xurtx3

碩士 === 中原大學 === 化學研究所 === 92 === In this study, we have applied the microwave technique to synthesize three-dimensional SBA-16 and nano-scale nanoporous molecular sieves. The technique offers many distinct advantages over conventional synthesis such as rapid heating, dissolving and well mixing. Microwave hydrothermal techniques with in-situ stirring not only speed up the crystallization of SBA-16 but also synthesize products with larger cubic unit cell, pore size and total pore volume as compared to that without stirring. In-situ stirring series of SBA-16 with good XRD patterns and narrow pore size distribution show their superior quality of cubic mesoporous structure. Products crystallized at 383K have surface area and pore size about 850 m2/g and 6.7 nm, respectively. We have also studies the influence of microwave irradiation reaction time and temperature on the SBA-16 structure and morphology. A series of nano-scale silicate, aluminosilicate and gallosilicate mesoporous molecular sieves can be prepared by microwave hydrothermal techniques for the radiation from 5 to 30 minutes. These nano-scale nanoporous materials own high surface area (600∼1000 m2/g ), pore valume (1.0∼2.0 m3/g), narrow pore size distribution and nanoparticle size between 20 and 100 nm, which were characterized by XRD patterns, N2 adsorption/desorption isotherms, and TEM pore image. Microwave irradiation temperature and time play an important role on these properties.