Effect of Gas Atmosphere on Carbothermal Reduction and Nitridation of Titanium Dioxide

Abstract

This article examined the reduction/nitridation of rutile in the He-N₂, Ar-N₂, and He (Ar)-H₂-N₂ gas mixtures, as well as pure nitrogen, in the temperature-programmed and isothermal experiments in a fixed-bed reactor. The extents of reduction and nitridation were determined from the off gas composition and LECO analysis. The off-gas composition was monitored using the infrared sensor (CO, CO₂, and CH₄) and dew point analyzer (H₂O). The phase composition of the reduced samples was analyzed using X-ray diffraction (XRD). The temperature and gas composition had a strong effect on the rutile reduction. The reduction was the fastest in the H₂-N₂ gas mixture, followed by a reduction in nitrogen; the rate of reduction/nitridation in the He-N₂ gas mixture was marginally higher than in the Ar-N₂ gas. The rate of titania reduction/nitridation in the He (Ar)-H₂-N₂ gas increased with the replacement of He (Ar) with hydrogen. The article also discusses the mechanisms of reduction/nitridation in different gas atmospheres.