用于CO甲烷化的Ni/CeO2催化剂还原过程重构行为调控研究

工程（英文） ›› 2022, Vol. 14 ›› Issue (7) : 94 -99. DOI: 10.1016/j.eng.2021.08.023

研究论文

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Controlling the Reconstruction of Ni/CeO2 Catalyst during Reduction for Enhanced CO Methanation

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摘要

还原预处理是活化负载型金属催化剂的重要步骤，但很少受到关注。本研究发现负载型镍催化剂的重构过程对预处理条件非常敏感。与使用氢气的传统活化方式相比，用合成气活化催化剂可以产生具有多晶结构的负载型镍纳米颗粒，其中包含丰富的晶界。独特的活化方式使得催化剂上CO吸附得到增强，提高了CO甲烷化率。通过操纵活化条件来调整催化剂结构的策略也可以被用于指导其他负载型金属催化剂的理性设计。

Abstract

Reductive pretreatment is an important step for activating supported metal catalysts but has received little attention. In this study, reconstruction of the supported nickel catalyst was found to be sensitive to pretreatment conditions. In contrast to the traditional activation procedure in hydrogen, activating the catalyst in syngas created supported Ni nanoparticles with a polycrystalline structure containing an abundance of grain boundaries. The unique post-activation catalyst structure offered enhanced CO adsorption and an improved CO methanation rate. The current strategy to tune the catalyst structure via manipulating the activation conditions can potentially guide the rational design of other supported metal catalysts.