Nonthermal plasma (NTP)-assisted CO₂ methanation can activate and convert stable CO₂ molecules under ambient conditions as compared to conventional thermal catalysis (normal operation temperature up to 450 °C), which is a good technique to reduce CO₂ emissions and simultaneously utilize the renewable energies like solar and wind. It is critical to develop a robust catalyst with good catalytic performance in order to make NTP catalytic CO₂ methanation more competitive. Herein, we present a simple yet efficient synthesis of CeO₂-supported Ni catalysts with yttrium (Y) as the promoter (i.e., Ni–Y/CeO₂) via mechanochemical synthesis for efficient NTP catalytic CO₂ methanation. The developed 7.5Ni–1Y/CeO₂ catalyst demonstrated the highest energy efficiency values for CO₂ conversion and CH₄ yield, i.e., ∼57 g_CO2 kWh^–1 and ∼17 g_CH4 kWh^–1, respectively. The CO₂-TPD and HRTEM results confirmed that the doped Y positively enhanced the basicity of the catalysts and also decreased the particle size of Ni nanoparticles, thus promoting the NTP catalytic activity of CO₂ methanation. The catalyst displayed excellent short-term stability for plasma catalytic CO₂ methanation over a 12 h on-stream evaluation, showing a CO₂ conversion of 84.2 ± 1.8% and a CH₄ selectivity of 83.3 ± 1.9%.

中文翻译：

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用于非热等离子体催化 CO2 甲烷化的 Ni-Y/CeO2 催化剂的机械化学合成

与传统的热催化（正常工作温度高达 450 °C）相比，非热等离子体 (NTP) 辅助 CO ₂甲烷化可以在环境条件下活化和转化稳定的 CO _{2分子，这是一种减少 CO 2}排放的良好技术，同时利用太阳能和风能等可再生能源。为了使NTP催化CO ₂甲烷化更具竞争力，开发具有良好催化性能的稳健催化剂至关重要。在此，我们提出了一种简单而有效的合成 CeO ₂负载的 Ni 催化剂，其中钇 (Y) 作为促进剂（即 Ni-Y/CeO ₂），通过机械化学合成用于高效的 NTP 催化 CO ₂甲烷化。开发的7.5Ni-1Y/CeO _{2催化剂表现出最高的CO 2}转化率和CH ₄产率的能量效率值，即分别为~57 g _{CO 2} kWh ^-1和~17 g _{CH 4} kWh ^-1。CO ₂ -TPD和HRTEM结果证实，掺杂Y正提高催化剂的碱度，同时减小Ni纳米粒子的粒径，从而促进了CO ₂甲烷化的NTP催化活性。该催化剂在 12 小时的在线评估中表现出优异的等离子体催化 CO ₂甲烷化的短期稳定性，显示出 CO₂转化率为 84.2 ± 1.8%，CH ₄选择性为 83.3 ± 1.9%。