烟气脱硫
吸附
化学
选择性
催化作用
有机硫化合物
核化学
无机化学
二苯并噻吩
化学工程
傅里叶变换红外光谱
作者
Yibin Tong,Junqing Li,Junchen Peng,Dandan Dong,Fei He,Mingyuan Zhu,Chaofeng Huang
标识
DOI:10.1016/j.cej.2021.132657
摘要
• Coupling Fe-S coordination and N/S electrostatic interaction achieved efficient and reversible desulfurization. • The desulfurization performance of Fe-N-C was optimized by the pyrrolic/pyridinic N and graphitic structure. • The robust and heterogeneous structure enabled the excellent reusability. By coupling P450 enzyme-like single-atom Fe-N center and graphitic N into N-doped carbon matrix, we precisely fabricated a robust Fe-N-C adsorbent for efficient, stable and reversible desulfurization, notably exceeding the counterparts of commercial carbon black, iron porphyrin and its hybrid. Our results disclosed that the adsorptive desulfurization mainly occurred in the atomic Fe-N and graphitic N sites via the formation of Fe-S bond between Fe3d and S3p orbitals, and N/S electrostatic interaction, respectively. The excellent desulfurization capability (34.03 mg S/g) of Fe-N-C not only originated from its effective adsorption sites, large surface area and abundant porosity, but also relied on the moderate binding strength between adsorption sites and organosulfur, which could be well optimized by modulating the pyrrolic/pyridinic N and graphitization structure, enabling its outstanding recyclability via a feasible cleavage of formed Fe-S and N-S bonds without obvious loss of activity. Moreover, Fe-N-C still maintained the 91.20% and 84.56% desulfurization selectivity, even in the presence of the interfacing substrates such as thiophene and 4,6-dimethyldibenzothiophene, respectively. This work would provide a new opportunity to metal-N-C with tunable site configuration and density for various selective adsorption and separation.
科研通智能强力驱动
Strongly Powered by AbleSci AI