Effect of Fe, Co and Ni promoters on MoS₂ based catalysts for chemoselective hydrogenation of nitroarenes

Abstract

The addition of promoters remarkably improved the activity for hydrogenation of nitroarenes in a sequence of Ni > Co > Fe > Mo and the amount of CUS active center was supposed to be the main reason to influence the reaction activity.

Quad-metallic MOF-derived carbon-armored pseudo-high entropy alloys as a bifunctional electrocatalyst for alkaline water electrolysis at high current densities

“…As for CoNiMo@C and FeNiMo@C, both having the NiMo synergy, CoNiMo@C showed superior HER performances to FeNiMo@C, which may be attributed to the fact that Co is a slightly more effective species than Fe in promoting the formation of coordinated unsaturated sites (CUS) for enhanced hydrogen adsorption. 48…”

“…As for CoNiMo@C and FeNi-Mo@C, both having the NiMo synergy, CoNiMo@C showed superior HER performances to FeNiMo@C, which may be attributed to the fact that Co is a slightly more effective species than Fe in promoting the formation of coordinated unsaturated sites (CUS) for enhanced hydrogen adsorption. 48 Finally, the HER stability of FeCoNiMo@C/NF was tested at −500 mA cm −2 over 50 h in 1 M KOH in a chronopotentiometric mode, and the resulting V-t curve is presented in Fig. 5e.…”

In Situ-Formed Cobalt Nanoparticles Embedded Within Carbonaceous Matrix as Highly Efficient and Selective Catalysts for the Hydrogenation of Nitroarenes

“…Two of the intermediates (i.e., nitrosoarene, and hydroxylamine) could undergo condensation reactions to form the azoxyarene intermediates, while the subsequent pathway of the hydrogenation process was followed by the reduction of azoxyarene and azoarene. According to the results reported by Wu et al 5 and Han et al 30 , the indirect pathway was more possible for the hydrogenation process catalyzed by Co-or Ni-based catalysts while the other transition metal such as Fe preferred to the direct pathway. Tian et al 28 also provided the DTF results for the selective hydrogenation of nitrobenzene to support the above mechanisms.…”

“…The above mention belonged to the direct pathways of nitroarene hydrogenation, and the whole process was completely on the surfaces of metallic nanoparticles wrapped with graphene shells. However, another indirect pathway might also exist on the basis of previous studies 5,30 . Two of the intermediates (i.e., nitrosoarene, and hydroxylamine) could undergo condensation reactions to form the azoxyarene intermediates, while the subsequent pathway of the hydrogenation process was followed by the reduction of azoxyarene and azoarene.…”