纳米棒
催化作用
选择性
化学
离解(化学)
价(化学)
阳离子聚合
钌
无机化学
化学工程
纳米技术
物理化学
材料科学
有机化学
工程类
作者
Z. H. An,Nan Ma,Yi Xu,Hua Yang,Huibo Zhao,Lizhi Wu,Li Tan,Chao Zou,Fanchun Meng,Bin Zhang,Xiuyun Wang,Yu Tang
标识
DOI:10.1016/j.jcat.2023.115245
摘要
Harnessing the selectivity in catalytic hydrogenation of CO2 is important for producing valuable chemicals. Herein, the shape dependency of the CO2 hydrogenation on singly dispersed Ru/CeO2 catalysts is investigated. CeO2 of three shapes, including nanocube, nanooctahedron and nanorod, are prepared as the catalyst supports and assigned to the surface of (100), (111) and (110) crystal plane, respectively. The Ru/CeO2 (nanorod) exhibits the highest selectivity to CO (97.6 %) at 350 °C, while the Ru/CeO2 (nanocube) exhibits a mediocre selectivity to CO (41.4 %) but the highest CO2 conversion. The shape of the CeO2 support determines the electronic state of supported Ru atoms through the electronic metal-support interaction. The low CO affinity on cationic Ruβ sites leads to the higher selectivity to CO on the Ru/CeO2 (nanorod) and Ru/CeO2 (nanooctahedron) catalysts, while the strong dissociation ability of H2 on low valence Ruα sites results in the high activity on the Ru/CeO2 (nanocube) catalyst.
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