Studies on the Preparation, Characterization and Catalytic Activity of the Nanosolid Heteropoly Acid H_3PW_(12)O_(40)/SiO_2 Using the Sol-Gel Method

摘要

A new nanosolid heteropoly acid H_(12)O_(40)/SiO_2 has been prepared by using the sol-gel method. The structure of this acid has been studied by infrard (IR) spectroscopy. X-ray diffraction (XRD) methods, transmission electron microscopy (TEM), X-ray photoemission spectroscopy (XPS) and specific area detector analysis. The results show that the nanoslid (diameter: 30-70 nm) is amorphous and has a large surface area (506.5 m~2 g~(-1)). Infrared spectra revealed tht the skeleton of the heteropoly anion PW_(12)O_(40)~(3-) still exists in the silica structure. The catalytic activity was measured by monitoring the synthesis of methyl t-butyl ether (MTBE); MTBE was obtained in yields of up to 84.0% and the catalst remained highly active after five uses.