Highly efficient and chemoselective hydrogenation of α,β-unsaturated carbonyls over Pd/N-doped hierarchically porous carbon

Abstract

Pd supported on N-doped hierarchically porous carbon was successfully applied in the selective hydrogenation of CC bonds.

Synergistic Effect of Tungsten Nitride and Palladium for the Selective Hydrogenation of Cinnamaldehyde at the C=C bond

“…It is well known that the metallic Pd with high electron density would accelerate its performance on chemoselective hydrogenation of a,bunsaturated carbonyls. [33] Thus, the conversion rate of CAL wasv aried by the interaction of Pd and WN. Given the same reactionc onditions, the 1.5 %P d-WN/SBA-15 ( Figure 7a)s howedf aster conversion rate of CAL than the 1.5 %P d/SBA-15 ( Figure 7b): it took 41 and 61 min to obtainaconversion of 50 %f or the 1.5 %P d-WN/ SBA-15 and 1.5 %P d/SBA-15, respectively.I na ddition, for the 1.5 %P d-WN/SBA-15, the selectivity to HALD slowly increased from 90.6 %a t1 0min to 97.6 %a t2h, and the selectivity to COL and HALC was distinctly lower than to HALD.H owever, for 1.5 %P d/SBA-15, the selectivity to HALD reached 59.5 %a t the beginning, and slowly decreased to 51.5 %s ubsequently; at the same time, the selectivity to HALC slowly rose up to 38.9 %.…”

“…The enhancedactivity and reaction rate may be contributed to the decreased Pd NPs size and the modified electronic structure of the surface Pd on 1.5 %P d-WN/SBA-15, which originated from the intensiveinteraction of Pd and WN. [33,38] The stability of the catalysts was also investigated in the selectiveh ydrogenation of CAL over the 1.5 %P d-WN/SBA-15 and 1.5 %P d/SBA-15. To our delight,t he 1.5 %P d-WN/SBA-15 still maintained its original activity after the fifth run, and the selectivity to HALD also showedn od istinct loss within five reaction cycles (Figure 9).…”

In Situ-Generated Co0-Co3O4/N-Doped Carbon Nanotubes Hybrids as Efficient and Chemoselective Catalysts for Hydrogenation of Nitroarenes

“…11,29,30 Though nitrogen doped graphene and carbon nanotubes (CNTs) can be applied into the reduction of 4-nitrophenol 31 and nitrobenzene 32 , strong reductants such as NaBH 4 , hydrazine hydrate and etc. rather than H 2 were inevitably used, still achieving inferior activity and limited reaction scope.…”

Synthesis of Hierarchically Porous Amorphous Alloy Hollow Sphere with High Surface Area as Effective and Selective Catalysts for Cinnamaldehyde Hydrogenation

“…This can be attributed to some parameters of the synthesized materials, such as the electron density, the hydrogen adsorption capacity and the porous structure etc. The results of XPS (Figure ) indicate that the Co‐Fe‐1 %Zn‐B possesses a higher electron density, which is beneficial to enhance the chemo‐selectivity of unsaturated carbonylation hydrogenation Therefore, the Co‐Fe‐1 %Zn‐B gives a higher COL selectivity than Co‐Fe‐10 %Zn‐B catalyst. Moreover, the high CAL conversion for this sample can be ascribed to its high hydrogen adsorption capacity, a key factor in catalytic performance of hydrogenation catalysts .…”