Chemoselective Hydrogenation of –C=O Bond in Multiple Unsaturated Compounds Over Metals Supported on Mesoporous Materials

Liquid-phase hydrogenation of crotonaldehyde in non-polar and polar solvents was studied on monometallic Pd, Pt, Ir, Re catalysts using mesoporous Sibunit and Al2O3 as supports. In the presence of Pd the -C=C- bond of crotonaldehyde was preferably hydrogenated to form butanal, while butanal and crotyl alcohol are formed over Ir catalysts. Crotonaldehyde hydrogenation in 1,4-dioxane did not exhibit further butanal to butanol hydrogenation. Application of Re as a catalyst leads to formation of crotyl alcohol, with activity being, however, twofold lower than of Ir catalysts. Pt/C is almost inactive in the hydrogenation of crotonaldehyde. Formation of crotyl alcohol occurs most efficiently over Ir/Al2O3 in aprotic nonpolar solvents (decane), with selectivity to crotyl alcohol increasing with temperature showing 30% at 25% conversion under 180 °C and hydrogen pressure 0.84 MPa. Crotonaldehyde hydrogenation in a polar protonic solvent (ethanol) results in butanal ac

Experimental and theoretical investigation into visible-light-promoted selective hydrogenation of crotonaldehyde to crotonyl alcohol using Au–Co,Ni alloy nanoparticle supported layered double hydroxides

Both the conversion of crotonaldehyde hydrogenation and the selectivity of crotonyl alcohol are greatly improved under visible light irradiation catalyzed by Au–Ni/LDHs.

Crotonaldehyde hydrogenation on platinum–titanium oxide and platinum–cerium oxide catalysts: selective CO bond hydrogen requires platinum sites beyond the oxide–metal interface

We have investigated a series of Pt–TiO2 and Pt–CeO2 catalysts for crotonaldehyde hydrogenation with the goal of better understanding the kinetics of CO bond hydrogenation.