In order to investigate the effect of support morphology and oxygen vacancy on the low temperature catalytic activity of Ni-based catalyst for CO₂ methanation, three Ni/CeO₂ catalysts were prepared by impregnation method, in which CeO₂ materials with different morphology of flowerlike, nanowire, and bulk were used. The characterization results showed that the morphology of CeO₂ exhibited a significant effect on the preferential exposed crystal planes, which led to the change of oxygen vacancy concentration and metal dispersion, resulting in the enhancement of catalytic activity at low temperature. Among all catalysts, the nanowire-like Ni/CeO₂ catalyst (Ni/W) showed the highest CO₂ conversion due to its enhanced oxygen vacancy concentration and CO₂ adsorption capacity of the catalyst. In situ DRIFTS experiment showed that the intermediate product of Ni/W catalyst reaction route was formate. In a 100 h–400°C–lifetime test, Ni/W catalyst also showed excellent long-term stability. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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Ni/CeO2 低温 CO2 甲烷化催化剂：载体形态和氧空位的识别效应

为了研究载体形态和氧空位对Ni基催化剂CO ₂甲烷化低温催化活性的影响，采用浸渍法制备了三种Ni/CeO ₂催化剂，其中CeO ₂材料具有不同的花状形态。 、纳米线和块状材料被使用。表征结果表明，CeO ₂的形貌对优先暴露的晶面表现出显着影响，导致氧空位浓度和金属分散度发生变化，从而提高低温催化活性。在所有催化剂中，纳米线状Ni/CeO ₂催化剂（Ni/W）表现出最高的CO ₂由于其增强的氧空位浓度和催化剂的CO ₂吸附能力而转化。原位DRIFTS实验表明Ni/W催化剂反应路线的中间产物是甲酸盐。在 100 h–400°C 寿命测试中，Ni/W 催化剂也表现出优异的长期稳定性。© 2021 化学工业协会和 John Wiley & Sons, Ltd.