超音波快速合成中孔洞材料 MCM-48 與以具羧基之 SBA-15 合成奈米鉑粒子

The thesis is divided into three parts. In part one, a rapid and facile synthesis route to synthesize mesoporous silica MCM-48 with the cubic Ia3d mesostructure has been developed using Gemini surfactant as a template with the aid of ultrasonic irradiation. The present synthesis route effectively reduces the total synthesis time from several days to only one day, which is much shorter than the conventional MCM-48 synthesis methods. We try to investigate the structural property as a function of ultrasonic time or hydrothermal time. The MCM-48 materials were characterized by a variety of techniques including powder X-ray diffraction (XRD), 29Si magic angle spinning (MAS) NMR, transmission electron microscopy (TEM), and scanning electron microscopy (SEM). In part two, we use the optimal condition we have found in the previous part, and we have incorporated aluminum into the MCM-48 silica framework successfully up to a Si/Al ratio of 25. In part three, the mesoporous silica SBA-15 materials containing carboxylic acid groups were used as a support to synthesize Pt nanoparticles. Various Pt loading levels from 3% to 10% on SBA-15 produced Pt nanoparticles with an average particle size of 3 to 4 nm.