The present work reports on the investigation of the catalytic performance for the methanation of CO₂ over Ni catalysts based on CeO₂, and for the first time, of Ni catalysts based on binary CeO₂-based oxides Sm₂O₃-CeO₂, Pr₂O₃-CeO₂ and MgO-CeO₂. The supports were obtained using the microwave assisted sol-gel method under reflux, while the catalysts were prepared by the wet impregnation method. For the investigation of the morphological, textural, structural and other intrinsic properties of the catalytic materials a variety of characterization techniques were used, i.e., Raman spectroscopy, XRD, N₂ physisorption-desorption, CO₂-TPD, H₂-TPR, H₂-TPD, XPS and TEM. Carbon deposition and sintering were investigated using TEM. It was shown that the addition of Sm³⁺ or Pr³⁺, incorporated into the lattice of CeO₂, generated oxygen vacancies, but the Ni/Pr-Ce catalyst was found to possess more surface oxygen vacancies (e.g. Ce⁴⁺-Ov-Pr³⁺ entities). Moreover, modification of CeO₂ using Sm³⁺ or Pr³⁺ restricted the agglomeration of nickel active sites and led to the genesis of Lewis basic positions. These characteristics improved the hydrogenation reaction at lower temperature. On the other hand, the addition of Mg²⁺ resulted at strong metal support interactions reinforcing the resistance of the Ni/Mg-Ce catalyst against sintering. Moreover, the addition of Sm³⁺, Pr³⁺ and Mg²⁺ cations increased the overall basicity and the moderate adsorption sites and led to the formation of smaller Ni nano particles; these physico-chemical properties enhanced the CO₂ methanation reaction. Finally, the activity experiments (WGHSV = 25,000 mL g⁻¹ h⁻¹, H₂/CO₂ = 4:1, T =350 °C) showed that at lower reaction temperature the Ni/Pr-Ce had the highest catalytic performance in terms of CO₂ conversion (54.5%) and CH₄ yield (54.5%) and selectivity (100%). The TOF values were found to follow the order Ni/Pr-Ce >> Ni/Mg-Ce > Ni/Sm-Ce > Ni/Ce.

本工作报告了关于研究基于CeO _2的Ni催化剂上CO ₂甲烷化甲烷化性能的研究，并且首次报道了基于二元CeO ₂基氧化物Sm ₂ O ₃ -CeO ₂的Ni催化剂的甲烷化性能， Pr ₂ O ₃ -CeO ₂和MgO-CeO ₂。使用微波辅助溶胶-凝胶法在回流下获得载体，同时通过湿浸渍法制备催化剂。为了研究催化材料的形态，结构，结构和其他固有特性，使用了多种表征技术，即拉曼光谱法，XRD，N ₂物理吸附-解吸，CO ₂ -TPD，H ₂ -TPR，H ₂ -TPD，XPS和TEM。使用TEM研究了碳沉积和烧结。结果表明，在CeO ₂晶格中加入Sm ³⁺或Pr ^3+会产生氧空位，但发现Ni / Pr-Ce催化剂具有更多的氧空位。表面氧空位（例如Ce ⁴⁺ -Ov-Pr ³⁺实体）。此外，使用Sm ³⁺或Pr ³⁺修饰CeO ₂限制了镍活性位的团聚，并导致了Lewis基本位置的产生。这些特性改善了在较低温度下的氢化反应。另一方面，Mg ^2+的添加导致较强的金属载体相互作用，从而增强了Ni / Mg-Ce催化剂的抗烧结性。此外，添加了Sm ³⁺，Pr ³⁺和Mg ²⁺阳离子增加了整体碱度和中等的吸附位，并导致形成了较小的Ni纳米颗粒。这些物理化学性质增强了CO ₂甲烷化反应。最后，活性实验（WGHSV = 25,000 mL g ^-1  h ^-1，H ₂ / CO ₂  = 4：1，T = 350°C）表明，在较低的反应温度下，Ni / Pr-Ce具有最高的催化性能在CO ₂转化率（54.5％）和CH ₄产率（54.5％）和选择性（100％）方面。发现TOF值遵循以下顺序：Ni / Pr-Ce >> Ni / Mg-Ce> Ni / Sm-Ce> Ni / Ce。