High surface area mixed oxide 8.7% NiO-CeO₂ nanoparticles (122 m²/g; 6–7 nm) were prepared using a reversed microemulsion method, and were tested for dry methane reforming (DRM). The catalytic activity of these nanoparticles remains stable under the severe conditions of DRM (700 °C), and they show better carbon resistance than conventional NiO-CeO₂ catalysts prepared without control of the size. The activity and selectivity of nanoparticles and reference catalyst are similar, but nanoparticles reduce the accumulation of carbon by 63% during the DRM tests, which is a key feature for this reaction. XPS and H₂-TPR suggest that the improved carbon resistance of the nanoparticles is due to the better interaction and cooperation between NiO and CeO₂ mixed phases. In nanoparticles, the participation of cerium cations in the redox processes taking place during DRM stabilizes cationic species of nickel. On the contrary, the catalyst prepared without control of the size suffers segregation of Ni during DRM reaction, and segregated Ni explains the higher catalytic formation of carbon.

高表面积混合氧化物 8.7% NiO-CeO ₂纳米粒子（122 m ² /g；6-7 nm）使用反向微乳液法制备，并进行了干甲烷重整 (DRM) 测试。这些纳米粒子的催化活性在DRM（700°C）的严酷条件下保持稳定，并且它们比未控制尺寸制备的常规NiO-CeO ₂催化剂表现出更好的抗碳性。纳米颗粒和参比催化剂的活性和选择性相似，但纳米颗粒在 DRM 测试期间将碳的积累减少了 63%，这是该反应的一个关键特征。XPS 和 H ₂-TPR 表明纳米颗粒的耐碳性提高是由于 NiO 和 CeO ₂混合相之间更好的相互作用和配合。在纳米粒子中，铈阳离子参与 DRM 过程中发生的氧化还原过程可稳定镍的阳离子种类。相反，在不控制尺寸的情况下制备的催化剂在 DRM 反应过程中会出现 Ni 的偏析，而偏析的 Ni 解释了更高的碳催化形成。