Preparation of Co‐based N‐doped Meso‐microporous Carbon for Hydrogenation of Nitroarenes

Abstract

The development of high‐efficiency and low‐cost heterogeneous catalysts with superior selectivity for the reduction of nitro compounds is desirable. Herein, we prepared Co‐based nitrogen‐doped meso‐microporous carbon (Co/N−C) derived from polyvinylpyrrolidone (PVP)‐coated zeolitic imidazolate framework (ZIF)‐67 as a heterogeneous catalyst for the synthesis of aromatic amines via in‐situ restricted pyrolysis. The structure, morphology, and catalytic activity of Co/N−C were investigated, and the results indicated that Co/N−C‐800 has the combined advantage of the excellent catalytic activity of cobalt nanoparticles and the high mass transfer rate of the N‐doped meso‐microporous carbon framework, achieving superior catalytic ability for the selective hydrogenation of 20 representative nitroaromatic compounds. Co/N−C‐800 was recyclable by simple separation due to the strong magnetism of the Co nanoparticles and exhibited excellent reusability, with 100 % yield of aniline even after six cycles. The catalytic reduction may be attributed to the dissociation of hydrazine to H+/H− via the action of Co/N−C.

Opportunities from Metal Organic Frameworks to Develop Porous Carbons Catalysts Involved in Fine Chemical Synthesis

“…A great variety of metallic N-doped porous carbons from MOFs applied in the synthesis of valuable compounds through oxidation and reduction reactions but also in coupling, cycloadditions, and acid-base catalyzed reactions have been reported (Table 3). Ag 1 Pd 9 @NPC-UiO-66-800 NH 2 -UiO-66 Nitrobenzene to aniline [111] Co/N@C-800 ZIF-67@PVP Nitrobenzene to aniline [112] Co@CN [Co(tpa)(dabco) 0.5 ] Cinnalmaldehyde to cinnamal alcohol [106] Pd/NPC-ZIF-8 ZIF-8…”