The coking issue is the main challenge for dry reforming of methane (DRM) over Ni-based catalysts. Herein, we excavate the reasons for the enhanced coking resistance of the bounded Ni over the free state Ni in Ni/γ-Al₂O₃ catalysts for DRM. Rational metal-support interaction of the bounded Ni would facilitate desorption of CO, thus suppressing CO disproportionation and decreasing carbon deposition. The higher activity of the bounded Ni is ascribed to better methane cracking ability, stronger adsorption, and activation of CO₂ by forming polydentate carbonate. The better activation of CO₂ over the bounded Ni would also contribute to the gasification of formed coke. We gain an insight into the anti-coking mechanism of DRM determined by metal-support interaction in Ni/γ-Al₂O₃ catalysts through mechanistic studies. It is believed that our findings would enlighten the design of more efficient catalysts for DRM.

结焦问题是在镍基催化剂上甲烷干重整 (DRM) 的主要挑战。在此，我们挖掘了在用于 DRM 的Ni/γ-Al ₂ O ₃催化剂中结合Ni 比游离态 Ni 增强抗结焦性的原因。结合Ni的合理金属-载体相互作用将促进CO的解吸，从而抑制CO歧化并减少碳沉积。结合Ni的较高活性归因于更好的甲烷裂解能力、更强的吸附和通过形成多齿碳酸盐活化CO ₂。更好地活化 CO ₂过界的 Ni 也有助于形成焦炭的气化。我们通过机理研究深入了解了由 Ni/γ-Al ₂ O ₃催化剂中金属-载体相互作用决定的 DRM 抗结焦机理。相信我们的发现将为设计更有效的 DRM 催化剂提供启发。