N-doped nanocarbons are promising materials for metal-free and supported catalysts. Three types of N-doped carbon nanotubes (N-CNTs) were synthesized by chemical vapor deposition (CVD), by oxidation of the CVD produced N-CNTs with nitric acid, and by post-doping of oxidized undoped CNTs with ammonia. Cobalt catalysts with 20[Formula: see text]wt.% loading supported on N-CNTs were tested in the Fischer–Tropsch synthesis. Oxidized N-CNTs containing pyridone groups demonstrated the best stabilization of cobalt nanoparticles. The catalyst on this support showed the highest selectivity towards [Formula: see text] hydrocarbons. The performance of the catalyst supported on CVD N-CNTs was the worst because of the large variation in cobalt particle size and low reduction degree. The catalysts supported on post-doped CNTs demonstrated the best activity, but high methane selectivity because of the low Co particle size ([Formula: see text][Formula: see text]nm).

中文翻译：

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负载在不同类型 N 掺杂碳纳米管上的钴基费托催化剂

N掺杂的纳米碳是用于无金属和负载型催化剂的有前途的材料。三种类型的 N 掺杂碳纳米管 (N-CNT) 通过化学气相沉积 (CVD) 合成，通过用硝酸氧化 CVD 产生的 N-CNT，以及通过用氨对氧化的未掺杂 CNT 进行后掺杂来合成。在 Fischer-Tropsch 合成中测试了负载在 N-CNT 上的负载为 20[公式：见正文]wt.% 的钴催化剂。含有吡啶酮基团的氧化 N-CNT 证明了钴纳米粒子的最佳稳定性。这种载体上的催化剂对[分子式：见正文]烃类表现出最高的选择性。负载在 CVD N-CNTs 上的催化剂的性能最差，因为钴粒径变化大，还原度低。负载在后掺杂碳纳米管上的催化剂表现出最好的活性，