Finding supported nickel catalysts with high activity and stability is yet a challenging aim for industrial applications. In this work, we synthesized a surface defect-promoted Ni catalyst supported on Mg/Al hydrotalcite via a freeze-dried method instead of calcination. This approach leads to the increase in oxygen vacancies, which is attributed to the high dispersion of active sites after adding samarium. X-ray diffraction (XRD) measurements demonstrate a homogeneous layered double hydroxide (LDH) structure without the formation of any oxides. High-resolution transmission electron microscopy (HR-TEM) and field emission scanning electron microscopy images (FE-SEM) illustrated that the samarium-promoted NiMgAl catalyst possesses a scaffold structure with surface defects and oxygen vacancies compared to the unpromoted NiMgAl catalyst which confirmed by X-ray photoelectron spectroscopy (XPS). Moreover, the impact of the samarium incorporation on the physicochemical features of NiMgAl catalysts was investigated for catalytic activity in dry and steam reforming of methane at 700 °C. NiMgAl-Sm catalyst showed the highest conversion of CH₄ (72%) and stability without any carbon formation during 20 h of time on stream in dry reforming process. because the strong metal–support interaction inhibits the sintering of nanocatalysts at 700 °C and the scaffold structure increases the mass transportation of feedstock and products.

寻找具有高活性和稳定性的负载型镍催化剂仍然是工业应用的一个具有挑战性的目标。在这项工作中，我们通过冻干法代替煅烧合成了一种负载在 Mg/Al 水滑石上的表面缺陷促进 Ni 催化剂。这种方法导致氧空位增加，这归因于添加钐后活性位点的高度分散。X 射线衍射 (XRD) 测量表明均匀的层状双氢氧化物 (LDH) 结构没有形成任何氧化物。高分辨率透射电子显微镜 (HR-TEM) 和场发射扫描电子显微镜图像 (FE-SEM) 表明，与未促进的 NiMgAl 催化剂相比，钐促进的 NiMgAl 催化剂具有具有表面缺陷和氧空位的支架结构。 X 射线光电子能谱 (XPS)。此外，研究了钐掺入对 NiMgAl 催化剂物理化学特征的影响，以研究在 700 °C 下甲烷干重整和蒸汽重整中的催化活性。NiMgAl-Sm 催化剂表现出最高的 CH 转化率₄ (72%) 和稳定性，在干重整过程中运行 20 小时期间没有任何碳形成。因为强烈的金属-载体相互作用抑制了纳米催化剂在 700°C 下的烧结，并且支架结构增加了原料和产品的质量传输。