Abstract
Highly-dispersed Pt nanoparticles supported on nitrogen-modified CMK-3 mesoporous carbon (Pt/N-CMK-3) were first fabricated by a two-step impregnation route. The influences of N content on the catalyst porous structure, Pt nanoparticle size, surface properties, and interaction between Pt species and the support were investigated in detail using N2 sorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectra (XPS). The N species acted as anchoring sites for the stabilization of Pt particles. Benefiting from the formation of ultrafine metal nanoparticles, the Pt/N-CMK-3 exhibited excellent catalytic activity and selectivity for the selective hydrogenation of nitro aromatics to the corresponding anilines with hydrogen. The Pt/N-CMK-3 catalyst could be reused eight times and keep its catalytic performance.
Highlights
Substituted aromatic amines are crucial industrial intermediates for the production of various fine chemicals, such as dyestuffs, agrochemicals, pharmaceuticals, and polymers, and most of them are synthesized by catalytic reduction of corresponding nitro aromatics [1,2,3]
We report for the first time an N-doped ordered mesoporous carbon fabricated by using a simple impregnation step with 2-methylimidazole as an ideal nitrogen source (N-CMK-3-x, where x represents the 2-methylimidazole amount)
Deionized water at room temperature; the amount of 2-methylimidazole was 1, 2, and 3 g in the synthesis of N-CMK-3-1, N-CMK-3-2, and N-CMK-3-3, respectively; the mixture was stirred at 60 ◦ C and the water was vaporized slowly; and the obtained solid was calcined in N2 atmosphere at 800 ◦ C for 6 h with a heating rate of 2 ◦ C min−1
Summary
Substituted aromatic amines are crucial industrial intermediates for the production of various fine chemicals, such as dyestuffs, agrochemicals, pharmaceuticals, and polymers, and most of them are synthesized by catalytic reduction of corresponding nitro aromatics [1,2,3]. Mesoporous materials are considered as the ideal choices as catalyst supports due to their large surface areas, tunable pore size, and thermal and chemical stability [23,24,25]. Functionalized supports, such as nitrogen doped mesoporous carbon, have received great interest because the incorporation of N atoms into mesoporous carbon frameworks alters the mechanical and electronic properties, and the surface chemical states, of carbon materials, and is efficient for the stabilization of the metal nanoparticle [26,27]. Pt/N-CMK-3 was rather stable without any leaching of metal nanoparticles and could be reused for the selective hydrogenation of nitrobenzene
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