NiAl hydrotalcite-type materials containing rare-earth elements (La, Ce, Y) are coated on thermal conductive NiCrAl open-cell foams by the electrodeposition method. After calcination and reduction at 600 °C, the obtained structured materials have a stable coating wherein Ni nanoparticles are well-dispersed. Consequently, the catalysts with rare-earth elements show a remarkable activity enhancement in the CO₂ methanation in comparison to a NiAl catalyst. At 325 °C (oven temperature) CH₄ productivity rates of 6.75–8.35 mole g_Ni⁻¹ h⁻¹ (38,200 h⁻¹, CO₂/H₂/N₂ = 1/4/1 v/v) are achieved. Ce has the largest effect on the improvement of the CO₂ conversion and stability (also feeding a N₂ free feedstock) followed by Y and La, due to the balance between the amount and activity of the catalytic coating. The Ce structured catalyst is also more active and selective than its pelletized counterpart at similar outlet temperature. Temperature profiles recorded along the centerline of the catalytic bed provide an overview of hotspot formation that plays an important role in the control of activity/selectivity and catalyst deactivation.

通过电沉积法将包含稀土元素（La，Ce，Y）的NiAl水滑石型材料涂覆在导热NiCrAl开孔泡沫上。在600℃下煅烧和还原后，所获得的结构化材料具有稳定的涂层，其中Ni纳米颗粒充分分散。因此，与NiAl催化剂相比，具有稀土元素的催化剂在CO ₂甲烷化中显示出显着的活性增强。在325°C（烤箱温度）下，CH ₄生产率为6.75–8.35 mol g _Ni ^-1 h ^-1（38,200 h ^-1，CO ₂ / H ₂ / N ₂= 1/4/1 v / v）。由于催化涂层的量和活性之间的平衡，Ce对改善CO ₂转化率和稳定性（还加入无N _2的原料）的影响最大，其次是Y和La。在相似的出口温度下，Ce结构催化剂比其颗粒状催化剂更具活性和选择性。沿催化床中心线记录的温度曲线提供了热点形成的概况，该热点在控制活性/选择性和催化剂失活中起着重要作用。