碳化物
离解(化学)
费托法
密度泛函理论
相(物质)
碳纤维
从头算量子化学方法
从头算
化学
气相
催化作用
结晶学
材料科学
计算化学
物理化学
选择性
分子
复合材料
有机化学
复合数
作者
Shu Zhao,Xingwu Liu,Chun‐Fang Huo,Xiaodong Wen,Wenping Guo,Dong‐Bo Cao,Yong Yang,Yongwang Li,Jianguo Wang,Haijun Jiao
标识
DOI:10.1016/j.cattod.2015.07.035
摘要
The structure and stability of seventeen facets of the Hägg carbide phase (χ-Fe5C2) under the consideration of K2O promotion have been analyzed utilizing density functional theory approach and ab initio atomistic thermodynamics. On the basis of different interaction strengths of these facets with K2O promoter, the morphology of the χ-Fe5C2 phase under the variation of K2O content has been predicated. At the surface Fe/K atomic ratio of 30, the morphology of the χ-Fe5C2 phase can be modified apparently. Among the most exposed (1 1 1), (1 0 0), (111¯), (5 1 0) and (4¯11) facets, the (111¯), (5 1 0) and (4¯11) facets have more open surface structures as well as provide more surface Fe atoms and less carbon atoms. However, all these mostly exposed facets do not favor CO direct dissociation at low CO coverage.
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