METHODS OF SYNTHESIZING NANO-SIZED TUNGSTEN PARTICLES BY SOL-GEL PROCESS AND METHOD OF PREPARING LIGHT OIL FROM EXTRA-HEAVY OIL USING THE SYNTHESIZED NANO-SIZED TUNGSTEN PARTICLES

摘要

Disclosed is a method of synthesizing nano-sized tungsten-silica core-shell particles by a silica-based sol-gel process. According to the method, tungsten-silica nanoparticles are very easy to synthesize by a simple process at ambient pressure and temperature. In addition, tungsten oxide-silica (WO_x@SiO₂) nanoparticles including tungsten in a stable oxidation state can be synthesized. In the tungsten oxide-silica nanoparticles, the size of the tungsten protected with the silica shell can be maintained in the nanometer range without further processing. Also disclosed is a method of synthesizing nano-sized tungsten oxide (WO_x) and tungsten carbide (WC) particles by further processing of the tungsten-silica core-shell particles.