Catalyst durability is one of the major problems hindering the commercialization of partial oxidation of methane (POM) for syngas production. We report that a Pt/MgAl₂O₄-HS catalyst with the MgAl₂O₄-HS support being synthesized via hydrolysis solvothermal (HS) method demonstrates high stability for POM during a 500 h life testing at 900 °C without detectable coke formation, while a Pt/MgAl₂O₄-CP counterpart in which MgAl₂O₄ was prepared by an optimized co-precipitation (CP) method exhibits continuous deactivation accompanied by coking. Using a suite of characterizations incluidng BET, H₂ chemisorption, XRD, STEM, TEM, TG/DTA and TPD of NH₃ and CO₂, we reveal that the high catalytic durability of the Pt/MgAl₂O₄-HS is due to the spinel surface of MgAl₂O₄-HS that can efficiently stabilize Pt against sintering. The Pt/MgAl₂O₄-CP, however, has defect Al₂O₃ or MgO-like species on the MgAl₂O₄-CP surface, inhibiting its capability to stabilize Pt. We confirm that the POM reaction undergoes a combustion-reforming pathway by monitoring the temperatures and gaseous product compositions along the catalyst bed. These results provide guidance for rational design of a longevity catalyst for POM process.

催化剂的耐久性是阻碍用于合成气生产的甲烷部分氧化（POM）的商业化的主要问题之一。我们报道了在Pt /镁铝₂ ö ₄ -HS与镁铝催化剂₂ ö ₄通过水解溶剂热被合成-HS支持（HS）方法在900℃的500小时生活测试而没有可检测的焦炭形成中演示了POM高稳定性，而其中通过优化的共沉淀（CP）方法制备MgAl ₂ O ₄的Pt / MgAl ₂ O ₄ -CP对应物表现出连续失活并伴随焦化。使用包括BET，H ₂在内的一系列表征化学吸附，XRD，STEM，TEM，TG / DTA和NH的TPD ₃和CO ₂，我们揭示了在Pt的高的催化耐久性/镁铝₂ ö ₄ -HS是由于镁铝尖晶石表面₂ ö _4个-HS可以有效地稳定Pt使其免受烧结。将Pt /镁铝₂ ö ₄ -CP，然而，有缺陷的Al ₂ ö ₃或MgO状上的MgAl物种₂ ö ₄-CP表面，抑制了其稳定Pt的能力。我们通过监测催化剂床沿的温度和气态产物组成，确认POM反应经历了燃烧重整路径。这些结果为合理设计用于POM工艺的长寿命催化剂提供了指导。