Hydrogenation of cinnamaldehyde to hydrocinnamaldehyde over Pd nanoparticles deposited on nitrogen-doped mesoporous carbon

Abstract

Nitrogen-doped mesoporous carbon (NMC) supported Pd nanoparticles catalyst exhibited an admirable catalytic activity in cinnamaldehyde hydrogenation to produce hydrocinnamaldehyde.

Improvement Effect of Ni to Pd-Ni/SBA-15 Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

“…This implies that the C=O group of HALD was difficult to activate under the above reaction conditions. Otherwise, one would expect the selectivity to HALD to diminish with time because of the reduction in the amount of HALD as a result of its hydrogenation to HALC [24,64]. It should be noted that the stability of the catalysts in the hydrogenation of CAL to HALD is very important.…”

“…In general, the selective hydrogenation of the C=C bond of CAL over different heterogeneous catalysts are summarized in Table S1. In order to obtain metal-based catalysts with superior performance, the best method is to prepare evenly dispersed metal nanoparticles on a large specific surface area support, for instance, mesoporous carbon, silica, alumina, and so on [24,[33][34][35]. Particularly, ordered mesoporous siliceous material SBA-15 is widely used as the support candidate due to its suitable pore size and large pore volume as well as high specific surface area [36,37].…”

“…We also have investigated in detail the CAL hydrogenation by using all sorts of catalysts consisting of Pt/Graphene [6], Pt/CNS and Pd/CNS [7], Pt-Mo 2 N/SBA-15 [8], Pd-WN/SBA-15 [9], and Co-Pt/SBA-15 [10]. In general, Pt [11][12][13], Ru [14,15], Au [16], Ir [17,18], Co [19,20], Cu [21,22] are conductive to the C=O bond hydrogenation to generate cinnamal alcohol (COL), while Pd [23,24], Rh [25,26], Ni [27][28][29] prefer a higher selectivity to the C=C bond, thus leading to the production of HALD. [23,24], Rh [25,26], Ni [27][28][29] prefer a higher selectivity to the C=C bond, thus leading to the production of HALD.…”

Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

“…Pt [16], Ru [17,18], Au [19], Ir [20] and Ni-Co bimetallic [21] catalysts have been reported to be selective for the hydrogenation of C=O to unsaturated alcohol. On the other hand, Pd [12,[21][22][23][24], Ni [25], Rh [26], Pt [9], Pt-Au [9] are selective for the hydrogenation of C=C to form saturated aldehyde. Literature report also shows that smaller Pd particle is selective towards C=C hydrogenation, forming HCAL, while larger Pd particle is selective towards C=O hydrogenation, forming HCOL [27].…”

“…Various attempts have been made to develop a suitable catalyst system for the selective (C=C vs. C=O) hydrogenation of CAL both in the gas-phase and in the liquid-phase [16][17][18][19][20][21][22][23][24][25][26][27][28].…”