ChemCatChem p. 5475 - 5486 (2019)
Update date:2022-08-17
Topics:
Xu, Dan
Zhao, Hong
Dong, Zhengping
Ma, Jiantai
It is important to develop a highly active and stable transition-metal catalyst 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-doped carbon nanotubes catalyst (Co@NCNTs) via a multiple pyrolysis of low-cost dicyandiamide and cobalt (II) acetylacetonate. The catalyst shows excellent activity and recyclability towards the oxidative dehydrogenation (ODH) and the catalytic transfer hydrogenation (CTH) for various N-heterocycles. The structure of outer N-doped carbon nanotubes (NCNTs) can protect Co NPs from aggregation and leaching. Moreover, the encapsulated Co NPs and the NCNTs may generate a synergistic effect. Both of them facilitate the high performance. The poisoning tests with KSCN were to clarify the different active sites for ODH and CTH reactions: the Co NPs could modify the NCNTs through electrons redistribution, therefore the NCNTs could directly activate O2 in ODH. The encapsulated Co NPs is enhanced by the doped N atoms which is good for the H2 activation in CTH. What's more, the mechanisms of ODH and CTH reactions were also proposed. This work provides a facile and low-cost method to design catalysts, which are dual-functional, highly active and stable, for industrial applications.
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Doi:10.1016/j.tet.2014.11.015
(2014)Doi:10.14233/ajchem.2013.14340
(2013)Doi:10.1021/ja01636a020
(1954)Doi:10.1039/b203762a
(2002)Doi:10.1016/S0022-1139(00)00258-X
(2000)Doi:10.1515/znb-2011-0608
(2011)