The sintering issue of Ni nanoparticles seriously limits the practical application of the Ni-based catalysts for CO methanation. This work demonstrates that the La- and Ce- dual-promoted Ni/ZrO shows better durability at 600 ºC and 60000 mL g h over 200 h compared with the La- or Ce- single-promoted. The composition and microstructure characterization indicates that the dispersion and sintering resistance of Ni nanoparticles is enhanced with the dual-promoted catalysts. Both depth profile of X-ray photoelectron spectroscopy and density functional theory calculation show that in the La- and Ce- dual-promoted Ni/ZrO, the reduced dissolution of Ce into ZrO lattice and the spread of La on ZrO surface by forming a LaO-CeO solid solution improves the dispersion and stability of Ni nanoparticles. This work provides a facile strategy to mitigate the sintering of Ni nanoparticles and thus improve the stability of Ni-based catalysts for CO methanation.

中文翻译：

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La-和Ce-双重促进的Ni/ZrO2 CO2甲烷化催化剂的鲁棒稳定性

Ni纳米颗粒的烧结问题严重限制了Ni基CO甲烷化催化剂的实际应用。这项工作表明，与 La- 或 Ce- 单促进相比，La- 和 Ce- 双重促进的 Ni/ZrO 在 600 ℃ 和 60000 mL gh 下超过 200 小时表现出更好的耐久性。成分和微观结构表征表明，双促进催化剂增强了镍纳米粒子的分散性和耐烧结性。 X射线光电子能谱的深度剖面和密度泛函理论计算表明，在La-和Ce-双促进的Ni/ZrO中，Ce向ZrO晶格的溶解减少，并且La通过形成LaO在ZrO表面上扩散。 -CeO固溶体提高了Ni纳米颗粒的分散性和稳定性。这项工作提供了一种减轻镍纳米颗粒烧结的简便策略，从而提高 CO 甲烷化镍基催化剂的稳定性。