Abstract CO2 hydrogenation to CH4 (or methanation) has been proposed to diminish CO2 emissions producing a valuable fuel. A catalyst consisting of NiO-CeO2 mixed oxide 6–7 nm nanoparticles with enhanced properties has been prepared, and compared with other NiO-CeO2 reference catalysts including a mixed oxide with the same composition but without control of the size, a counterpart NiO-CeO2 mixed oxide with three dimensionally ordered macroporous (3DOM) structure and an inverse catalyst consisting of bulk NiO-supported CeO2 nanoparticles among others. At 275 °C the CO2 methanation rate is near 3 times higher to that achieved with the counterpart reference catalyst prepared without control of the size, being more active than all reference catalysts. The selectivity towards CH4 formation is ~100% in the whole range of temperature studied (until 500 °C), and kept the same activity and selectivity during a 25 h long-term test. The high activity of this catalyst is related with its high specific surface area (122 m2/g) and with the presence of highly-reducible Ni-O-Ce species on the nanoparticles surface

中文翻译：

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用于 CO2 甲烷化的活性、选择性和稳定的 NiO-CeO2 纳米粒子

摘要 CO2 加氢为 CH4（或甲烷化）已被提议减少 CO2 排放，产生有价值的燃料。制备了一种由具有增强性能的 NiO-CeO2 混合氧化物 6-7 nm 纳米颗粒组成的催化剂，并与其他 NiO-CeO2 参考催化剂进行了比较，包括具有相同组成但不控制尺寸的混合氧化物，对应的 NiO-CeO2具有三维有序大孔（3DOM）结构的混合氧化物和由块状NiO负载的CeO2纳米颗粒等组成的逆催化剂。在 275 °C 下，CO2 甲烷化速率比不控制尺寸制备的对应参考催化剂高出近 3 倍，比所有参考催化剂更具活性。在研究的整个温度范围内（直到 500 °C），对 CH4 形成的选择性约为 100%，并在 25 小时的长期测试中保持相同的活性和选择性。该催化剂的高活性与其高比表面积 (122 m2/g) 以及纳米粒子表面存在高度还原的 Ni-O-Ce 物种有关