【作者】 卓欧； 高福杰； 吕金钊； 吴强； 杨立军； 王喜章； 胡征；

【Author】 Ou Zhuo;Fujie Gao;Jinzhao Lu;Qiang Wu;Lijun Yang;Xizhang Wang;Zheng Hu;Key Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University;

【机构】 介观化学教育部重点实验室南京大学化学化工学院；

【摘要】 费托合成提供了由非石油路线获取高附加值基础化学品的有效途径,随着后石油时代的临近,其重要性及战略意义日显突出。其中,费托合成制低碳烯烃（C₂⁼-C₄⁼）具有重要的应用价值,但目前仍面临着催化剂选择性低、稳定性差等问题。我们以氮掺杂碳纳米管（NCNTs）为载体,通过浸渍法构建了Fe/NCNTs催化剂,利用氮的锚定作用可方便地实现Fe纳米粒子的均匀负载,无需对载体做任何表面预处理。对比研究发现,NCNTs负载的催化剂在低碳烯的选择性、催化活性和稳定性方面均优于碳纳米管（CNTs）和活性炭（AC）负载的催化剂,其原因是N掺杂位有效促进了Fe物种的分散,且有利于其还原和碳化,从而有效提高了催化剂的活性和稳定性。更多还原

【Abstract】 Iron-based Fischer-Tropsch synthesis（FTS） catalyst for lower olefins with high selectivity and stability is of great importance in post-petroleum era. By means of the anchoring effect and the intrinsic basicity of nitrogen-doped carbon nanotubes（NCNTs）, iron nanoparticles were conveniently immobilized on NCNTs without surface pre-modification. The so-constructed Fe/NCNTs catalyst presents superb catalytic performance in FTS with high selectivity for lower olefins as well as high activity and stability. The excellent performance is well-correlated with enhanced dissociative CO adsorption, inhibition of secondary hydrogenation of lower olefins, and promoted formation of the active phase of χ-Fe₅C₂. All of these merits result from participation of the nitrogen. These results may lead to a new strategy for exploring advanced FTS catalysts with abundant N-doped carbon nanostructures.更多还原