Methane oxidation over Pd/Al₂O₃ has been investigated by in situ XAFS characterization during oxygen step-response experiments. With a net-reducing feed gas, Pd is in a reduced state and the introduction of oxygen leads to oxidation of palladium as well as increased methane conversion. When the rate of Pd oxidation is slow, a transient surface oxidized state is observed with low activity for methane oxidation. The activity increases when palladium is further oxidized and the highest activity is observed for palladium oxide.

中文翻译：

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甲烷在Pd / Al ₂ O _3上氧化的氧阶跃响应实验：原位XAFS研究

在氧阶跃响应实验过程中，通过原位XAFS表征研究了Pd / Al ₂ O ₃上的甲烷氧化。使用净减少的进料气，Pd处于还原状态，氧气的引入导致钯的氧化以及甲烷转化率的提高。当Pd的氧化速度慢时，观察到短暂的表面氧化态，对甲烷的氧化活性低。当钯进一步被氧化时，活性增加，并且对于氧化钯观察到最高的活性。