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Selective Catalytic Hydrogenation of α,β-Unsaturated Aldehydes
A Strongly Coupled Ultrasmall Pt3Co Nanoparticle-Ultrathin Co(OH)2 Nanosheet Architecture Enhances Selective Hydrogenation of α,β-Unsaturated Aldehydes.
ACS Catal. 2019;
19 March 2019 (online)
Key wordsplatinum catalysis - cobalt catalysis - hydrogenation - regioselectivity - enals - allylic alcohols
Pt3Co nanoparticles strongly grafted with Co(OH)2 nanosheet [Pt3[email protected](OH)2-NS] were prepared by mixing Pt(acac)2, Co(acac)3, and Mo(CO)6 in MeOH–H2O–octylamine at 220 °C (eq.1). Pt3[email protected](OH)2-NS catalyzed the selective hydrogenation of α,β-unsaturated aldehydes to give the corresponding allylic alcohols with ≤100% conversion and ≤100% selectivity (eq. 2; 5 examples).
The catalyst was characterized by means of TEM, HRTEM, XRD, XPS, AFM, ATR-IR, and ICP-AES analyses. In the hydrogenation of cinnamaldehyde, the selectivity of Pt3[email protected](OH)2-NS for the formation of cinnamyl alcohol was superior to that of the other Pt catalysts such as Pt nanoparticles (NPs), Pt3Co NPs, Pt NPs on Co(OH)2-NS, or Pt3Co NPs on Co(OH)2-NS. In the hydrogenation of cinnamaldehyde, the catalyst was recovered by centrifugation and reused nine times without loss of its activity. TEM images of the recovered catalyst after tenth run showed almost no changes.