Cobalt single atoms supported on monolithic carbon with a hollow-on-hollow architecture for efficient transfer hydrogenations  

作　　者：Xiangyi Gong De-Chang Li Qian Zhang Wenquan Wang Zhengbin Tian Ge Su Minghua Huang Guang-Hui Wang 

机构地区：[1]School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China [2]Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2023年第8期11358-11365,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52100169);the Natural Science Foundation of Shandong Province(Nos.ZR2020QB196,ZR2022ZD30,and ZR2020QB053).

摘　　要：Single-atom catalysts(SACs)have received considerable attention in hydrogenation of nitroaromatic compounds to aromatic amines.In order to enhance the exposure of single atoms and overcome the mass transfer limitation,construction of hierarchical porous supports for single atoms is highly desirable.Herein,we report a straightforward method to synthesize Co single-atoms supported on a hollow-on-hollow structured carbon monolith(Co_(1)/HOHC-M)by pyrolysis ofα-cellulose monolith loaded with PS-core@ZnCo-zeolite imidazolate frameworks-shell nanospheres(PS@Zn-ZIFs/α-cellulose).The hollow-on-hollow structure consists of a large hollow void with a diameter of~290 nm(derived from the decomposition of polystyrene(PS)nanospheres)and a thin shell with hollow spherical pores with a diameter of~10 nm(derived from the evaporation of ZnO nanoparticles that are in-situ formed during pyrolysis in the presence of CO_(2)fromα-cellulose decomposition).Benefitting from the hierarchically porous architecture,the Co_(1)/HOHC-M exhibits excellent catalytic performance(reaction rate of 421.6 mmol·gCo^(-1)·h^(−1))in the transfer hydrogenation of nitrobenzene to aniline,outperforming the powdered sample of Co_(1)/HCS without the hollow spherical mesopores(reaction rate of 353.8 mmol·gCo^(-1)·h^(−1)).It is expected that this strategy could be well extended in heterogeneous catalysis,given the wide applications of porous carbon-supported single-atom catalysts.

关 键 词：hollow-on-hollow Co single-atoms NITROBENZENE transfer hydrogenation 

分 类 号：O64[理学—物理化学]