Silica-supported iron nitride in Fischer-Tropsch reactions
Silica-supported iron nitride in Fischer-Tropsch reactions
复制标题
DOI：
10.1016/0021-9517(85)90337-9
复制
发表时间：
1985-02
影响因子：
7.3
通讯作者：
E. B. Yeh;N. Jaggi;J. Butt;L. Schwartz
中科院分区：
文献类型：
--
作者：
E. B. Yeh;N. Jaggi;J. Butt;L. Schwartz
利用Mössbauer效应光谱和广角x射线衍射技术对硅胶负载型氮化铁催化剂（初始成分≈Fe2N）进行了表征。Mössbauer光谱分析表明，在合成气环境下（CO: H2= 1:3，T= 250°C, 7.8 atm），氮化催化剂在反应的前3小时变得富铁，这表明H2去除氮原子的速度比同时被碳原子取代的速度快。3 h后渗碳占主导地位，碳浓度增加，反应约18 h后催化剂组成稳定。反应49 h后，对平衡催化剂的4.2 K Mössbauer光谱和x射线衍射分析得出Fe2.18C1−yNY的组成，其估计在0.13至0.20之间。
The techniques of Mössbauer effect spectroscopy and wide angle X-ray diffraction have been applied to characterize nitrided iron catalysts (initial composition ≈ Fe2N) supported on silica gel and used in the synthesis reaction. Mössbauer spectroscopy shows that the nitride catalyst becomes iron-rich during the first 3 h of reaction in the syngas environment (CO: H2= 1:3,T= 250 °C, 7.8 atm) indicating that nitrogen atoms are removed more rapidly by H2than they are simultaneously replaced by carbon atoms. After 3 h carburization becomes dominant, the carbon concentration increases, and the catalyst composition stabilizes after about 18 h of reaction. The analysis of the 4.2 K Mössbauer spectrum and X-ray diffraction of an equilibrated catalyst after 49 h of reaction gives a composition of Fe2.18C1 −yNY, whereywas estimated to be between 0.13 and 0.20.