Present paper reports on the CO2 methanation (CME) performance of novel Ni catalysts supported on yttria, ceria, and ceria-doped yttria carriers. Catalysts were synthesized using incipient wetness impregnation and precursor nitrate co-decomposition. These systems outperformed on a mass-specific basis an industrial Ni/alumina benchmark catalyst. In addition, this work examines in details the impact of both the preparation procedure and the Ni-content on the CME activity both in terms of the reaction rate and the apparent activation energy. Our research demonstrates that Y2O3 is an effective catalytic support promoting stability and activity of the catalysts. CeO2–doping further improves activity, remarkably with little to no penalty to the thermal stability of the catalysts. Comparison of the performance of a conventional IWI-synthesized Ni-catalyst with a counterpart obtained via a co-decomposition route, demonstrated an advantage of the latter. Our findings suggest Ni-CeO2/Y2O3 prepared via co-decomposition may be advised as the active and stable catalysts for CME applications.

中文翻译：

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CO2甲烷化对Ni/Y2O3催化剂的影响：制备方法和氧化铈促进的影响


本文报告了负载在氧化铈、氧化铈和氧化铈掺杂氧化钇载体上的新型 Ni 催化剂的 CO2 甲烷化 （CME） 性能。使用初期湿浸渍和前驱体硝酸盐共分解合成催化剂。这些体系在质量特异性基础上优于工业镍/氧化铝基准催化剂。此外，这项工作还详细研究了制备程序和 Ni 含量对 CME 活性在反应速率和表观活化能方面的影响。我们的研究表明，Y2O3 是一种有效的催化载体，可促进催化剂的稳定性和活性。CeO2 掺杂进一步提高了活性，显著改善了催化剂的热稳定性，几乎没有影响。将常规 IWI 合成的镍催化剂与通过共分解路线获得的对应物的性能进行比较，证明了后者的优势。我们的研究结果表明，通过共分解制备的 Ni-CeO2/Y2O3 可以建议作为 CME 应用的活性和稳定催化剂。