Toward the improvement in unsaturated alcohol selectivity during α,β-unsaturated aldehyde selective hydrogenation, using Zn as promoter of Pt

Enhancing Metal–Support Interactions by Molybdenum Carbide: An Efficient Strategy toward the Chemoselective Hydrogenation of α,β‐Unsaturated Aldehydes

“…Pt/Mo 2 C with detectable Pt dÀ species presents ar emarkablyh igher CROL selectivity of 66 %t han Pt/SiO 2 (32 %), which is consistent with the previously reported Pt dÀ that benefits the C=Oh ydrogenation. [28,48] Correspondingly,A u/Mo 2 Cd elivers as lightly higher selectivity of CROL (53 %) than Au/SiO 2 (49 %). [52] In the hydrogenation of CRAL to CROL, ah igh activity and selectivity are usually difficult to achieve at the same time on metals withoute lectronic metal-support interactions, [53] as illustrated by the initial performance on SiO 2 -supported Ir,P t, and Au (Figure 5b).…”

“…The nega- tively charged Ir dÀ on Mo 2 C, distinguishedf rom the metallic Ir 0 on inert SiO 2 ,w ould prefer the adsorption and activation of the polar C d + =O dÀ bond due to the enriched de lectrons in Ir, which is commonly accepted in the chemoselective hydrogenation by using Pt-group metals. [21,28,48] Furthermore,t he selective hydrogenation on Ir/Mo 2 Cisi nfluenced by the nature of the Mo 2 Ca nd the Ir loading, as ar esult of the Ir-Mo 2 Ci nteractions. When commercial Mo 2 Ci se mployed as supports [denoted as Ir/Mo 2 C(c)],t he CRAL conversion (51 %) and the CROL selectivity (60 %) are lower than those on Ir/Mo 2 Cu nder the same condition (entry 3i nT able 1), which can be ascribed to the small surface of bulky Mo 2 C ( Figure S6 in the SupportingI nformation).…”

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

“…In general, Pd catalysts are in favor of the hydrogenation of the C=C bond to produce HALD, and Pt‐based catalysts facilitate the production of cinnamyl alcohol (COL) through the hydrogenation of the C=O bond . Although the reduction of the C=C group is favored thermodynamically, it is still challenging to enhance the efficiency of Pd catalysts and lessen Pd usage …”

“…[4] Cinnamaldehyde (CAL), as typical a,b-unsaturateda ldehyde, can result in various product distributions in its hydrogenationroute (Scheme 1), depending on the active metal,solvent, and promoter.I ng eneral,P dc atalysts are in favor of the hydrogenation of the C=Cb ond to produce HALD, and Ptbased catalysts facilitate the production of cinnamyl alcohol (COL) through the hydrogenation of the C=Obond. [5] Although the reductiono ft he C=Cg roup is favored thermodynamically, [6][7][8][9][10][11] it is still challenging to enhancethe efficiency of Pd catalysts and lessen Pd usage. [12,13] In recent years, metal nitrides have been studied intensely owing to their synergistic effects andP t-like behavior in tradi-tional catalysis and electrocatalysis.…”

Zinc influence on the formation and properties of Pt/Mg(Zn)AlO catalysts synthesized from layered hydroxides

“…It was shown that the structure and properties of zinc-containing LDH are close to those of magnesium-aluminum system, and these LDH can form the oxide phase with a developed surface area. The use of zinc for modification of platinum properties is well known [22,[41][42][43]. The platinum-zinc system resembles the platinum-tin one.…”