Calcination‐Induced Pore Evolution in TiO ₂ Supports Governing Ni Accessibility for Dry Methane Reforming

/CO ratio of ∼0.95 at 800°C. It also exhibited superior stability during 50 h at 700°C. Low-temperature-calcined support allowed Ni precursors to infiltrate mesopores, which collapsed during subsequent 900°C calcination, leading to Ni encapsulation and poor activity. In contrast, high-temperature-calcined supports (≥900°C) generated thermally stable structures that prevented Ni infiltration, preserving surface-exposed Ni sites. This high site accessibility is a decisive factor governing the enhanced DRM performance. These findings demonstrate that support thermal stability and Ni accessibility outweigh mesoporosity or Ni particle size, offering insights for designing thermally robust oxide-supported catalysts.