林荣和

基本信息Personal Information

副研究员(自然科学) 硕士生导师

性别 : 男

毕业院校 : 中国科学院大连化学物理研究所

学历 : 博士研究生毕业

学位 : 博士学位

在职信息 : 在岗

所在单位 : 杭州高等研究院

入职时间 : 2019年11月14日

办公地点 : 杭州高等研究院童趣楼101-2

联系方式 : 0571-82257902

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20240626_Cu/Fe3O4在水气变化变换反应中的界面效应论文发表于Int. J. Hydrog. Energ, 祝贺2021级研究生谭瑞帆!

发布时间 : 2024-06-26   点击量 :

Interfacial effects of Cu/Fe3O4 in water-gas shift reaction: role of Fe3O4 crystallite sizes

Ruifan Tan1†, Kaixuan Zhuge,2 † Xinzheng Ma1,3, Xiaoling Mou1,4*, Mengxiang Ren1†, Renqin Chang2*, Qi Zhou5, Li Yan3, Ronghe Lin1,4, and Yunjie Ding1,3,6*

Interfacial effects of Cu/Fe3O4 in water-gas shift reaction: Role of Fe3O4 crystallite sizes - ScienceDirect

 


ABSTRACT

Copper-promoted iron oxides are commonly utilized in high-temperature water-gas shift (WGS) reactions. Although the promotional effect of Cu has been previously documented, the nature of the active sites for Cu/Fe3O4 remains debated and the role of the crystallite size of Fe3O4 has not been tackled. In this study, a wide range of Cu/Fe3O4 catalysts were designed by hosting Cu species onto Fe3O4 of two contrasting crystallite sizes (approximately 10 and 160 nm) and by utilizing different preparation methods (ammonia evaporation and deposition-precipitation). The evaluation of their catalytic WGS performances revealed a remarkable and previously undocumented phenomenon: the addition of Cu resulted in universal activity enhancements only for small Fe3O4 crystals, while the larger analogues displayed decreased activity. This peculiar phenomenon can be explained by the creation of Cu-Fe3O4 interfaces present in the iron oxides of small crystallite sizes. Thorough characterizations, such as advanced electron microscopic, in situ powder X-ray diffractions, in situ diffuse reflectance infrared Fourier transform spectroscopy, and computational studies, suggest strong electronic interactions between the different metal species, facilitated reductions of the individual oxides, and more favourable CO activation at the interfacial sites, all accounting for the promoted activity.


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