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.