Catalytic combustion is promising in removing trace amounts of CH₄ to address serious environmental concerns. Supported Pd‐based catalysts are most effective but often suffer from low stability in applications owing to the water‐vapor‐induced sintering. Herein, we develop a universal strategy to prepare irreducible‐oxide‐modified Pd/MgAl₂O₄ catalysts which show high activity and excellent stability against both hydrothemal aging at elevated temperatures and deactivation in long‐term reaction under wet conditions. The addition of irreducible oxides inhibited the deep oxidation of Pd in the oxygen‐rich conditions, which preserved not only the epitaxial structure but also a suitable active phase of Pd‐PdO_x on MgAl₂O₄, thus promoting both activity and stability. This work provides new insights into the effect of metal–oxide interaction on CH₄ combustion and offers an avenue to design hydrothermally stable and active combustion catalysts for industrial applications.

中文翻译：

---

用于甲烷燃烧的水热稳定不可还原氧化物改性的Pd / MgAl2 O4催化剂。

催化燃烧有望去除痕量的CH ₄来解决严重的环境问题。负载型Pd基催化剂最有效，但由于水蒸气引起的烧结，在应用中经常会遇到稳定性低的问题。在此，我们制定了一种普遍的策略来制备不可还原的氧化物改性的Pd / MgAl ₂ O ₄催化剂，该催化剂在高温下的加氢热老化和在潮湿条件下的长期反应失活方面均显示出高活性和出色的稳定性。在富氧条件下添加不可还原的氧化物抑制了Pd的深度氧化，不仅保留了外延结构，而且还保留了Pd-PdO _x在MgAl ₂上的合适的活性相。O ₄，因此促进活性和稳定性。这项工作为金属氧化物相互作用对CH ₄燃烧的影响提供了新的见解，并为设计用于工业应用的水热稳定和活性燃烧催化剂提供了途径。