Cobalt Nanoparticles Apically Encapsulated by Nitrogen‐doped Carbon Nanotubes for Oxidative Dehydrogenation and Transfer Hydrogenation of N‐Heterocycles
作者:Dan Xu、Hong Zhao、Zhengping Dong、Jiantai Ma
DOI:10.1002/cctc.201901304
日期:2019.11.21
It is important to develop a highlyactive and stable transition‐metalcatalyst with dual‐functional properties in the reversible transformations between various saturated and unsaturated N‐heterocycles. Herein, we prepared the cobalt nanoparticles (Co NPs) apically encapsulated by the N‐dopedcarbon nanotubes catalyst (Co@NCNTs) via a multiple pyrolysis of low‐cost dicyandiamide and cobalt (II) acetylacetonate
Catalytically Active Co−N
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Species Stabilized on Nitrogen‐doped Porous Carbon for Efficient Hydrogenation and Dehydrogenation of N‐heteroarenes
作者:Dan Xu、Hong Zhao、Zhengping Dong、Jiantai Ma
DOI:10.1002/cctc.202000826
日期:2020.9.4
stable non‐noble‐metal catalysts is important for synthetic chemistry. In this study, a highly dispersed Co catalyst stabilized on the mesoporous N‐doped carbon layers was prepared by adsorption and pyrolysis of cobalt complex on dendritic fibrous silica nanospheres (KCC‐1@Co−N−C−T). The characterizations of HAADF‐STEM, XRD and XPS together with the KSCN poisoning tests determine the absence of Co0
are widely used as industrial polymers. The obtained nanostructured materials catalyze the transferhydrogenation of N-heteroarenes with formic acid in the absence of base. The optimal Co/Melamine-2@C-700 catalyst exhibits high activity and selectivity for the dehydrogenation of formic acid into molecular hydrogen and carbon dioxide and allows for the reduction of diverse N-heteroarenes including substrates
the selective transfer hydrogenation of quinoline derivatives to 1,2,3,4-tetrahydroquinolines (THQs) with formic acid in pure water. Moreover, by simply adapting the amount of formic acid used, N-formyltetrahydroquinolines (FTHQs) could be selectively synthesized from quinolines in two-step, one-pot transfer hydrogenation/N-formylation reactions with these supported catalysts. Notably, these supported
Quasi-continuous synthesis of cobalt single atom catalysts for transfer hydrogenation of quinoline
作者:Liyun Huang、Hao Zhang、Yujie Cheng、Qingdi Sun、Tao Gan、Qian He、Xiaohui He、Hongbing Ji
DOI:10.1016/j.cclet.2021.10.004
日期:2022.5
quasi-continuous synthesis S, N co-doped carbon supported Co singleatomcatalysts (Co/SNC), which was used for transfer hydrogenation of quinoline with formic acid as the hydrogen donor. Given the unique geometric and electronic properties of the Co singleatoms, the excellent catalytic activity, selectivity and stability were observed. Benefiting from the quasi-continuous synthesis method, the as-obtained
改进N的转移氢化-杂芳烃对各种工业过程至关重要,迄今为止仍然是一个挑战。我们在此报道了一种准连续合成 S、N 共掺杂碳负载 Co 单原子催化剂 (Co/SNC) 的微胶囊热解策略,该催化剂用于以甲酸为氢供体的喹啉转移氢化。鉴于Co单原子独特的几何和电子特性,观察到了优异的催化活性、选择性和稳定性。受益于准连续合成方法,所获得的催化剂为大规模制备无放大效应的单原子催化剂提供了参考。高催化性能和准连续制备工艺,