Wang H,
Bai S,
Pi Y,
Shao Q,
Tan Y,
Huang X.
* Soochow University, Jiangsu and Hunan Normal University, Changsha, P. R. of China
A Strongly Coupled Ultrasmall Pt
3Co Nanoparticle-Ultrathin Co(OH)
2 Nanosheet Architecture Enhances Selective Hydrogenation of α,β-Unsaturated Aldehydes.
ACS Catal. 2019;
9: 154-159
Key words
platinum catalysis - cobalt catalysis - hydrogenation - regioselectivity - enals -
allylic alcohols
Significance
Pt3Co nanoparticles strongly grafted with Co(OH)2 nanosheet [Pt3Co@Co(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). Pt3Co@Co(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).
Comment
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 Pt3Co@Co(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.
