Reduction Process og Tungsten Subchlorides with Hydrogen

Abstract

The reduction process of tungsten dichloride, tungsten tetrachloride, tungsten pentachloride, and tungsten subchloride which might be represented by an empirical formula of WCl2.6 with hydrogen was examined by thermal gravimetric and X-ray analyses. TGA curve of dichloride is shown in Fig.1. Dichloride was reduced with hydrogento tungsten above 380° C. TGA curve of WCl2.6 is shown in Fig.2. WCl2.6 was reduced with hydrogen to tungsten via the dichloride above 315° C. TGA curve of the tetrachloride is shown in Fig.3. The tetrachloride was reduced with hydrogen to tungsten via WCl2.6, the dichloride above 270° C: The reduction was accompanied by the disproportionation of 13.0% of the tetrachloride with the formation of WCl2.6 and the gaseous pentachloride above 295° C. The WCl2.6 formed was then reduced with hydrogen in the same way as described above. TGA curve of the pentachloride is shown in Fig.5. The pentachloride vaporized above 105° C. The vaporization was accompanied by the reduction of 17.7% of the pentachloride to the tetrachloride with hydrogen. The tetrachloride formed exhibited the same behavior as described above.