Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

Abstract

Catalysts with Co nanoparticles (NPs) entrapped in N,S‐codoped carbon shells were successfully fabricated by pyrolysis of porous organic polymers (POPs) with cobalt salts. The encapsulated structure consisting of Co NPs and N,S‐codoped carbon layers was verified by TEM, XRD, and X‐ray photoelectron spectroscopy. The catalysts displayed excellent activity and stability for the catalytic transfer hydrogenation (CTH) of nitrobenzene with formic acid under base‐free conditions. Furthermore, the resultant catalysts allowed for highly efficient and selective transfer hydrogenation of various functionalized nitroarenes to the corresponding anilines. Through control experiments, the covered Co NPs were identified as active sites for CTH. The incorporation of S into the N‐doped carbon lattice promoted the electron transfer from metallic cobalt NPs to their shells, which played a significant role in the acceleration of CTH. Moreover, the Co‐NSPC‐850 catalyst pyrolyzed at 850 °C showed excellent stability in the recycling experiments.

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO3

“…Preparation of POPs : POPs were synthesized according to our previous work . Melamine (1.26 g) and terephthalaldehyde (2.00 g) were dissolved into 62 mL DMSO.…”

“…Preparation of POPs: POPs were synthesized according to our previous work. [18] Melamine (1.26 g) and terephthalaldehyde (2.00 g) were dissolved into 62 mL DMSO. The solution was transferred into a1 00 mL polyphenylene oxide (PPO) lined autoclave, heated to 180 8Ca nd kept for 10 h. After cooling down to ambient temperature, 100 mL water was added to the mixture to afford light brown precipitate.…”

“…toxic hydrofluoric acid or heated sodium hydroxide solution), nano‐CaCO 3 , or its decomposition product CaO, are liable to be etched with diluted acid, thus making it a feasible accessory ingredient to enhance the porous structure of resultant materials. In our previous work, S, N‐containing porous organic polymers (POPs) were prepared via condensation polymerization of melamine and terephthalaldehyde in dimethyl sulfoxide (DMSO) . During the condensation process, some decomposition products of DMSO (e.g.…”

“…In our previousw ork, S, N-containing porouso rganic polymers (POPs) were prepared via condensation polymerization of melamine and terephthalaldehyde in dimethyl sulfoxide (DMSO). [18] During the condensation process, some decomposition products of DMSO (e.g. dimethyl sulfide) interactw ith POPs to achieve the introduction of sulfur.…”

Biomass-derived Fe-NC hybrid for hydrogenation with formic acid: control of Fe-based nanoparticle distribution

“…Compared with other reductants, FA, with great application prospects in hydrogen generation, is nontoxic, renewable and easily available. 13 In the CTH process, the catalyst is of vital importance. In the past decade, noble metal catalysts had been extensively studied, showing high activity.…”