2018
DOI: 10.1021/acsami.8b15300
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Nitrogen-Doped Carbon Materials for the Metal-Free Reduction of Nitro Compounds

Abstract: In this study, nitrogen-doped carbon materials (labeled as NC-T) were easily prepared by thermal treatment of the melamine−chitosan composite. NC-T catalysts demonstrated good activity toward the reduction of nitro compounds by using hydrazine hydrate (N 2 H 4 •H 2 O) as the reductant. The activity of NC-T enhanced with the rise of the pyrolysis temperature because of the enhanced ratio of graphitic-type nitrogen, which might be the active sites for the reduction of nitro compounds. NC-950 showed high activity… Show more

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Cited by 85 publications
(58 citation statements)
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“…It could be assumed that the dissociation of hydrazine on the surface Co−N species of the Co@CN/SiO 2 catalysts was also performed through the similar mechanism of hydrazine to on metal nitride for the selective reduction of nitro groups. Therefore, it was proposed that hydrazine molecule might be first adsorbed on the metallic Co atoms; the synergistic effect between the Co and pyridinic N atoms in the Co−N species promoted heterolytic cleavage of hydrazine hydrate to form H − species and split‐over H + species in a Co−H − form and in a N−H + , respectively . The nitro groups on the catalyst surface interacted with the adjacent H + /H − pairs to form the nitroso intermediates.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…It could be assumed that the dissociation of hydrazine on the surface Co−N species of the Co@CN/SiO 2 catalysts was also performed through the similar mechanism of hydrazine to on metal nitride for the selective reduction of nitro groups. Therefore, it was proposed that hydrazine molecule might be first adsorbed on the metallic Co atoms; the synergistic effect between the Co and pyridinic N atoms in the Co−N species promoted heterolytic cleavage of hydrazine hydrate to form H − species and split‐over H + species in a Co−H − form and in a N−H + , respectively . The nitro groups on the catalyst surface interacted with the adjacent H + /H − pairs to form the nitroso intermediates.…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, it was proposed that hydrazine molecule might be first adsorbed on the metallic Co atoms; the synergistic effect between the Co and pyridinic N atoms in the CoÀ N species promoted heterolytic cleavage of hydrazine hydrate to form H À species and split-over H + species in a CoÀ H À form and in a NÀ H + , respectively. [50,64,65] The nitro groups on the catalyst surface interacted with the adjacent H + /H À pairs to form the nitroso intermediates. These nitroso compounds were further reduced to hydroxylamine, which was directly hydrogenated to benzene amine (Scheme 1).…”
Section: Reduction Mechanism Of Nitro Aromatics Over Co@cn/sio 2 Catalystsmentioning
confidence: 99%
“…4, N-hydroxyaniline as the sole intermediate was both observed in the hydrogenation of nitrobenzene over NiCu/C@SiO2-800 and Ni/C@SiO2-800, indicating that the aniline synthesis from nitrobenzene hydrogenation over the prepared catalysts mainly followed the direct way. [45][46][47] The direct way includes the formation of nitrosobenzene, N-hydroxyaniline and finally aniline, following three consecutive hydrogenation steps. In our reaction, no nitrosobenzene intermediates were observed; thus, it indicated that the nitro group was first reduced to the nitroso intermediate and then hydrogenated to Nhydroxyaniline very quickly, and the hydrogenation of hydroxylamine to aniline was the rate-determining step.…”
Section: Catalytic Reactionmentioning
confidence: 99%
“…Chitosan is a polysaccharide obtained from the deacetylation of chitin which is easily extracted from shrimp's shell [51]. Chitosan is biocompatible and was proved to be a useful material in a wide range of fields, such as food industry, water treatment [52], tissue engineering, medical area [53], supercapacitor [54], CO 2 hydrogenation [55], reduction of nitro compounds [56], batteries [57,58] and fuel cell devices [30,59,60]. Furthermore, chitosan is a suitable N-containing biopolymeric material with a high N content (7.1%) and jellifies by producing a self-template hydrogel precursor.…”
Section: Introductionmentioning
confidence: 99%