Molybdenum and nickel-molybdenum nitride catalysts supported on MgO-Al₂O₃ were synthesized and tested for methane dry reforming at temperatures of 760−840 °C. Two in-situ nitridation procedures involving heating the catalyst in NH₃/N₂ or H₂/N₂ gas at a space velocity of 44 s⁻¹ and 5 °C/min heating rate, were assessed and compared with a conventional reduction procedure. The activity of the bimetallic nitride was much higher than that of molybdenum nitride, with a slightly better performance with H₂/N₂-treated catalysts. The nitrides showed deactivation and poor stability at atmospheric pressure. The nitride phase was shown to transition into an oxide/carbide phase during reaction. Furthermore, hydrogen/nitrogen treatment caused partial reduction to occur, which explains the activity improvement in bimetallic Ni-Mo nitrides. Whisker carbon was significantly decreased although carbon formation was observed. The basic support improves coking resistance by enhancing CO₂ adsorption. Initial results indicate a unique activation site for both methane and CO₂ through a Mars-Van Krevelen mechanism, with a phase transformation followed by a carbide-oxide redox cycle mechanism taking place.

合成了负载在MgO-Al ₂ O ₃上的钼和镍钼氮化物催化剂，并在760-840°C的温度下进行了甲烷干重整测试。评估了两种原位氮化程序，涉及在NH ₃ / N ₂或H ₂ / N ₂气体中以44 s ^-1的空速和5°C / min的加热速率加热催化剂，并将其与常规还原程序进行比较。双金属氮化物的活性远高于氮化钼，在H ₂ / N _2下的性能稍好。处理的催化剂。氮化物在大气压下表现出失活和稳定性差。氮化物相在反应过程中转变为氧化物/碳化物相。此外，氢/氮处理引起部分还原的发生，这解释了双金属Ni-Mo氮化物的活性提高。尽管观察到碳形成，但晶须碳显着降低。碱性载体通过增强CO ₂吸附来改善耐焦化性。初步结果表明，通过Mars-Van Krevelen机理，甲烷和CO ₂均具有独特的活化位点，随后发生相变，随后发生碳化物-氧化还原循环机理。