A core-shell catalyst Ni@Al₂O₃/AlN was prepared in a facile and environmental way and used for dry reforming of methane (DRM). The Ni nanoparticles (NPs) were supported on AlN and encapsulated by Al₂O₃ overlayers, which were self-assembled via room-temperature degradation of AlN in moist air. Meanwhile, the nickel ions preferentially incorporate into the tetrahedral vacancies of the AlN to form strong metal-support interaction as demonstrated by theory as well as experiment. Based on the dual confinement effects, the stability of Ni@Al₂O₃/AlN catalyst was superior to that of the Ni/AlN and Ni/α-Al₂O₃, exhibiting negligible coke deposition and small growth of Ni NPs after 100 h time on stream (TOS) at high temperatures (973 and 1073 K). These results demonstrated that this green synthetic strategy offered a promising solution for preventing metal NPs migration and coalescence, especially for the high-temperature catalytic reactions.

以简便，环保的方式制备了核壳催化剂Ni @ Al ₂ O ₃ / AlN，并将其用于甲烷的干重整（DRM）。Ni纳米颗粒（NPs）负载在AlN上并被Al ₂ O ₃覆盖层封装，该覆盖层通过室温下在潮湿空气中降解AlN进行自组装。同时，如理论和实验所示，镍离子优先结合到AlN的四面体空位中，形成强烈的金属-载体相互作用。基于双限制效应，将Ni的Al @稳定性₂ ö ₃ / AlN成催化剂优于镍/ AlN和镍/α-Al系的₂ ö ₃，在高温（973和1073 K）上运行100小时后（TOS），焦炭沉积量可忽略不计，Ni NP的生长很小。这些结果表明，这种绿色合成策略为防止金属NP迁移和聚结（特别是对于高温催化反应）提供了有希望的解决方案。