The partial oxidation of methane (POM) is an attractive catalytic route for producing syngas (CO/H₂), although there are problems to overcome such as high reaction temperature (>650 °C) and the deactivation of the catalyst due to the coke formation. We addressed the problem by including HCl in the POM over a Pd/CeO₂ catalyst. Pd/CeO₂ produces CO, CO₂, and coke with low CO selectivity in the absence of HCl, while it converts methane to chlorinated products at below 450 °C in the presence of HCl. At above 480 °C, however, highly selective CO (>99%) is produced over Pd/CeO₂ via the POM. Moreover, it is found that coke is not formed during the reaction, leading to the stable partial oxidation activity and selectivity up to 40 h. Both surface and bulk characterization results strongly propose that HCl plays an essential role in transforming Pd/CeO₂ into (PdCl_x + Pd⁰)/CeOCl (0 < x ≤ 2), which provides the ideal environment for the catalytic route of the POM.

甲烷的部分氧化（POM）是生产合成气（CO / H ₂）的有吸引力的催化途径，尽管存在诸如高反应温度（> 650°C）和由于焦炭导致催化剂失活等问题需要克服编队。我们通过在Pd / CeO ₂催化剂上的POM中加入HCl解决了这一问题。在不存在HCl的情况下，Pd / CeO ₂产生的CO，CO ₂和焦炭的CO选择性低，而在HCl存在下，在低于450°C的温度下，Pd / CeO ₂将甲烷转化为氯化产物。但是，在高于480°C的温度下，在Pd / CeO _2上会产生高选择性的CO（> 99％）通过POM。此外，发现在反应过程中不形成焦炭，导致​​稳定的部分氧化活性和选择性长达40小时。表面和本体表征结果都强烈建议HCl在将Pd / CeO ₂转化为（PdCl _x  + Pd ⁰）/ CeOCl（0 <x≤2）中起重要作用，这为POM的催化路线提供了理想的环境。 。