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首页> 外文期刊>Catalysis science & technology >Ceria-zirconia encapsulated Ni nanoparticles for CO2 methanation
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Ceria-zirconia encapsulated Ni nanoparticles for CO2 methanation

机译：Ceria-zirconia封装镍纳米颗粒二氧化碳甲烷化

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摘要

We prepared uniformly-sized Ni nanoparticles on ceria-zirconia (CZ) as model catalysts for CO2 methanation in the context of renewable energy storage. CZ was synthesized via a sol-gel method with Ni being introduced either via incipient-wetness impregnation on calcined CZ or as a colloidal Ni nanoparticle (NiNP) dispersion during sol-gel synthesis. Catalysts were characterized with XRD, N-2 physisorption, H-2-TPR, H-2 chemisorption, XPS and HAADF-STEM with EDX mapping. The Ni/CZ (IWI) catalyst contained large Ni particles after reduction, whereas co-gelation led to NiNP encapsulated in CZ, the particles retaining their initial size of 4.5 nm obtained by the earlier colloidal synthesis. Encapsulated Ni@CZ exhibited superior catalytic activity and stability for CO2 methanation over Ni/CZ. A comparison of Ni@CZ with (encapsulated) Ni@SiO2 prepared from the same colloidal NiNP dispersion showed that CZ shows a strong synergy with Ni in CO2 methanation and results in an order of magnitude higher activity compared to SiO2.
机译：我们准备好的uniformly-sized镍纳米颗粒催化剂对二氧化碳ceria-zirconia (CZ)模型甲烷化的可再生能源存储。倪是通过引入的在煅烧CZ或incipient-wetness浸渍作为胶体镍纳米颗粒(NiNP)色散在溶胶-凝胶法合成。具有XRD、n -物理吸附,H-2-TPR, 2化学吸收作用、XPS和HAADF-STEM和EDX映射。包含大型镍粒子还原后,而co-gelation导致NiNP封装在CZ,粒子保留他们的初始大小4.5纳米胶体早些时候获得的合成。二氧化碳的催化活性和稳定性在Ni / CZ甲烷化。(封装)Ni@SiO2准备的胶体分散NiNP表明CZ相同显示了很强的协同作用与倪二氧化碳甲烷化并导致高一个数量级活动与二氧化硅相比。

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