Deoxidation thermodynamics of Ti-O in hydrogen atmosphere: Preparation of TiH2 alloy powder by direct reduction of spent V2O5-WO3/TiO2 catalyst with magnesiothermic

The abundant metal Ti is a high-quality metal with lightweight, high strength, and corrosion resistance. However, due to its harsh preparation conditions, the price remains high, so titanium metal's simple and effective products have become a challenge for the world's scientific research community. In this paper, by calculating the oxygen potential of Ti-O, Ti-H, and Ti-H-O solid solutions, the oxygen potential of Ti-H-O was obtained when the oxygen content was 0.03 and 0.009. As H2 enters the Ti-O lattice, the oxygen potential of the Ti-H-O system increases with the increase of H content. Thermodynamic calculations showed that introducing hydrogen effectively destroyed the stability of Ti-O solid solutions. At the same time, this paper uses a magnesiothermic as a reducing agent. To verify the feasibility of the above thermodynamics, reduce the spent V2O5-WO3/TiO2 catalyst (Ti > 80 wt%) of titanium-rich materials in a hydrogen atmosphere. Finally, the spent V2O5-WO3/TiO2 catalyst was reduced at 750 degrees C for 8-24 h to obtain TiH2 powder with an oxygen content of 0.9 wt%.

Automated summary

In this paper, the oxygen potential of Ti-H-O was calculated under different oxygen contents. It was found that the oxygen potential increased with the increase of H content in the Ti-H-O system. Thermodynamic calculations showed that introducing hydrogen effectively destabilized the Ti-O solid solutions. The spent V2O5-WO3/TiO2 catalyst was successfully reduced using a magnesiothermic as a reducing agent in a hydrogen atmosphere, resulting in TiH2 powder with an oxygen content of 0.9 wt%.