The methane oxidation reaction was investigated over Pd and Ni doped hydroxyapatite (HAP) catalysts. All catalysts were evaluated in both their reduced and oxidised forms, and the behaviour of the metals in the reaction was investigated. The obtained results demonstrated that the reaction proceeds through a redox cycle between metal oxide and reduced metal, however more stable catalysts with higher conversions were observed when the catalysts were pre-treated in oxygen. After CH₄ oxidation, all the samples were tested towards coke formation using TGA analysis; results showed that all the catalysts were resistant to the coking process under the conditions studied.

在Pd和Ni掺杂的羟基磷灰石（HAP）催化剂上研究了甲烷的氧化反应。评价了所有催化剂的还原和氧化形式，并研究了金属在反应中的行为。所获得的结果表明，反应是通过金属氧化物与还原金属之间的氧化还原循环进行的，但是当催化剂在氧气中进行预处理时，观察到了具有更高转化率的更稳定的催化剂。CH ₄氧化后，使用TGA分析测试所有样品的焦炭形成；结果表明，在所研究的条件下，所有催化剂均对焦化过程具有抵抗力。