Rare earth element (La, Y, and Ce) modified MgAl-hydrotalcites of MgAlM were synthesized from coprecipitation and calcination, and further loaded with CoMo active species to give CoMo/MgAlM catalysts. X-ray powder diffraction, inductively coupled plasma, and N₂ adsorption isotherms indicate that MgAlM possess large BET surface areas (58–91 m²/g), and rare earth elements were successfully introduced into samples. CO₂-TPD (temperature-programmed desorption), NH₃-TPD, H₂-TPR (temperature-programmed reduction), H₂S-TPS (temperature-programmed sulfidation), and Raman spectra indicate the presence of unique interactions between rare earth elements and Mo active species, which strongly affect the reduction and sulfidation behaviors of these catalysts. High resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) analysis suggest that the addition of rare earth elements decreases the slab length and stacking numbers of MoS₂ and promotes the sulfidation degree of Mo oxides. The above characteristics make CoMo/MgAlM act as highly active catalysts for the water gas shift reaction (WGSR). This work develops a facile and cost-effective method for rational design of efficient catalysts for WGSR in industrial processes.

中文翻译：

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掺杂稀土元素（Y，La，Ce）对CoMo / MgAlM催化水煤气变换反应性能的影响

通过共沉淀和煅烧合成了稀土元素（La，Y和Ce）改性的MgAlM的MgAl-水滑石，并进一步负载了CoMo活性物种，得到了CoMo / MgAlM催化剂。X射线粉末衍射，电感耦合等离子体和N ₂吸附等温线表明MgAlM具有较大的BET表面积（58-91 m ² / g），并且稀土元素已成功引入样品中。CO ₂ -TPD（程序升温脱附），NH ₃ -TPD，H ₂ -TPR（程序升温还原），H ₂S-TPS（程序升温硫化）和拉曼光谱表明，稀土元素与Mo活性物种之间存在独特的相互作用，这会严重影响这些催化剂的还原和硫化行为。高分辨率透射电子显微镜（HRTEM）和X射线光电子能谱（XPS）分析表明，稀土元素的添加减少了MoS ₂的平板长度和堆积数量，并促进了Mo氧化物的硫化程度。上述特性使CoMo / MgAlM成为水煤气变换反应（WGSR）的高活性催化剂。这项工作为工业过程中WGSR的高效催化剂的合理设计开发了一种简便且具有成本效益的方法。