Boosting Methane Dry Reforming via Enhanced CO2 Adsorption over TiN-Supported Ni Catalysts

Abstract

Herein, titanium nitride (TiN) is employed as a support for nickel (Ni) catalysts in the dry reforming of methane. TiN exhibits strong metal–support interactions that remarkably enhance Ni dispersion. In addition, TiN possesses strong CO2 and H2 adsorption properties and electron-donating capability. Collectively, these properties inhibit carbon buildup and enhance catalytic reactivity. A synergistic interaction with CaO, a secondary defence layer, dramatically boosts catalyst stability. At a similar initial conversion rate, the 5Ni-3CaO/TiN catalyst showed outstanding performance，achieving CH4 and CO2 conversion rates of 81.6% and 87.9%, respectively. The deactivation rates of DCH4 and DCO2 were 0.018 h−1 and 0.028 h−1, respectively, in the 20-hour stability test.