Selective hydrogenation of unsaturated carbonyl compounds over an oxidized gold–zirconium alloy

Abstract

An oxidized amorphous Au-Zr alloy showed high selectivities for partial hydrogenation of unsaturated carbonyl compounds to unsaturated alcohols, contrasting with their low catalytic activity in the hydrogenation of unsaturated to saturated alcohols; the active sites of this catalyst are modified gold rather than impurities since the amounts of impurities present were too small (<80 p.p.m.) to show hydrogenation activity.

Green, Multi‐Gram One‐Step Synthesis of Core–Shell Nanocomposites in Water and Their Catalytic Application to Chemoselective Hydrogenations

“…In this context, Au NP catalysts have attracted attention due to their high chemoselectivity for the hydrogenation of polar functional groups . However, Au catalyst systems still suffer from limited substrate scope,– the requirement of harmful additives,,,, and low atom‐efficient hydride reagents,,, producing large amounts of waste. Therefore, the chemoselective reduction of various functional groups catalyzed by Au catalysts using H 2 as a green reductant under additive‐free conditions is still a challenging issue.…”

Selective hydrogenation of furfural on Ir/TiO2 catalysts

“…[7][8][9][10] Several research groups have reported catalysts able to selectively reduce certain conjugated aldehydes such as crotonaldehyde and cinnamaldehyde to the corresponding unsaturated alcohols. [11][12][13][14][15] Different metals and supports have been used to study the selective hydrogenation of these kinds of unsaturated compounds. Thus, metals such as Ru, Rh, Co, Pt, Os and Ir have been studied, showing great differences in activity and selectivity.…”

Applications of Metal Nanopore Catalysts in Organic Synthesis

“…Different combinations of the two metals were studied, from which Ru 1 Pt 4 -nanoparticles led to 87% conversion with 51%, 26% and 22% selectivity toward 26, 25 and 24, respectively (Table 7, entry 4). On the other hand, Pt 1 Ru 1 -nanoparticles showed 82% yield with 35%, 30% and 23% selectivity toward Shibata et al 76 explored, for the first time, the use of a heterogeneous gold catalyst (Au-Zr alloy) for the hydrogenation of α,β-unsaturated aldehydes. Following this discovery, Bailie and Hutchings 77 employed ZnO and zirconium(IV) oxide (ZrO 2 ) supported gold catalysts for selective C=O hydrogenation of crotonaldehyde.…”