Producing syngas from dry reforming of methane is fascinating but challenging because of coking and sintering. Herein, fine Ni nanoparticles surrounded by Al₂O₃ are constructed by ion-exchange inverse loading method. The dual confinement composed of physical barrier originated from Al₂O₃ surroundings and chemical bonding sourced from NiAl₂O₄ spinel is present on pitaya-like Ni@Al₂O₃ catalysts. Mixed acid–base property of Ni@Al₂O₃ mediates the co-conversion of CH₄ and CO₂. On the one hand, the acidity of Al₂O₃, accelerates the pyrolysis of CH₄. On the other hand, the basicity originated form ample O²⁻ promotes the chemisorption of CO₂ and oxidisation of carbon deposition using CO₂ as oxidiser. Based on the dual confinement and cooperation of acid–base sites, Ni@Al₂O₃ survive severe coking with a CO₂ conversion above 85% and no sign of deactivation. The metal-oxide interface is investigated focusing on physical–chemical confinement and properties, including electronic interaction, mixed acid–base property, and chemisorption of probe molecule.

Graphical Abstract

中文翻译：

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双限域镍基催化剂离子交​​换反加载用于甲烷干重整

通过甲烷干重整生产合成气是令人着迷的，但由于焦化和烧结而具有挑战性。在此，通过离子交换反相负载法构建了被Al ₂ O _{3包围的细小的Ni纳米颗粒。类火龙果}Ni@ _{Al 2 O 3 催化剂上存在由Al 2} O ₃环境的物理屏障和NiAl ₂ O ₄尖晶石的化学键组成的双重限制。_{Ni@Al 2} O ₃的混合酸碱性质介导CH ₄和CO ₂的共转化。一方面，Al ₂ O _{3的酸性加速了CH 4}的热解。另一方面，源自充足的O ^{2−的碱度促进CO} ₂的化学吸附和使用CO ₂作为氧化剂的碳沉积的氧化。基于酸碱位点的双重限制和配合，Ni@Al ₂ O ₃能够在严重的焦化中幸存下来，CO ₂转化率高于85%，并且没有失活的迹象。研究金属-氧化物界面的重点是物理化学限制和性质，包括电子相互作用、混合酸碱性质和探针分子的化学吸附。

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