石墨氮化碳
X射线光电子能谱
催化作用
硫黄
X射线吸收光谱法
材料科学
漫反射红外傅里叶变换
碳纤维
氮化物
选择性
吸收光谱法
无机化学
化学
化学工程
纳米技术
光催化
有机化学
冶金
复合数
图层(电子)
物理
量子力学
工程类
复合材料
作者
Ganchang Lei,Wentao Zhao,Lijuan Shen,Shijing Liang,Chak Tong Au,Lilong Jiang
标识
DOI:10.1016/j.apcatb.2020.118663
摘要
Iron-based catalysts are promising for the catalytic oxidation of H2S owing to their non-toxicity, abundance, and high conversion efficiency. However, their industrial applications are hampered by the low selectivity and poor durability. Herein, we reported a simple one-step pyrolysis approach to synthesize isolated Fe–Nχ sites confined in graphitic carbon nitride (Fe-CN-NHχ). The creation of isolated Fe–Nχ sites was evidenced by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray absorption spectroscopy (XAS), UV–vis-NIR diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The well dispersed Fe–Nχ sites offer additional active centers for the reaction, and such form of Fe presence effectively resists the deep oxidation of H2S. As a result, the obtained Fe-CN-NH5 catalyst exhibited outstanding catalytic performance with high sulfur selectivity. Significantly, the Fe–Nχ sites are resistance to sulfur poisoning, leading to excellent durability in the reaction. No obvious decrease of catalytic activity was observed in a reaction period of 180 h, which is better than those of reported iron-based catalysts.
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