Article ID Journal Published Year Pages File Type
1418962 Carbon 2008 7 Pages PDF
Abstract
Metallic and carburized tungsten nanoparticles have been prepared using WCl6 as precursor. The synthesis steps lead from tungsten hexachloride to tungsten carbide following the sequence WCl6 → W0 → α-W2C → WC. These different compounds have been mainly characterized by X-ray diffraction, TEM observations and adsorption measurements. The total reduction of tungsten hexachloride can be completed at T = 973 K. The carburizing of the metallic lattice into carbide WC is observed at 1223 K although incomplete. At this temperature, crystal growth phenomena appear which are not desired for catalysis applications. The synthesis of nanoparticles supported on activated carbon is accompanied by a decrease of the specific surface area of samples, especially during high temperature carburizing.
Related Topics
Physical Sciences and Engineering Energy Energy (General)
Authors
, , , ,