No abstract

The selectiveh ydrogenation of a,b-unsaturated aldehydes to unsaturated alcohols is an important processf or many industrial applications, whereas the realization of excellent conversion efficiency and selectivity remains as ignificant challenge. Herein, we report the preparation of ac lass of networked Pt-Sn nanowires (Pt-Sn NWs) for the selective hydrogenation of unsaturated aldehydes to the desired unsaturated alcohols. The optimized Pt 1.5 Sn NWs delivered ahigh conversion efficiency (98.1 %) for the hydrogenation of cinnamaldehyde (CAL) and excellent selectivity to cinnamyl alcohol (COL) (90.6 %); thus, they outperformed Pt 1.5 Sn nanoparticles (NPs) as wella s Pt NPs. The high performance of the Pt 1.5 Sn NWsw as expanded to the hydrogenation of other a,b-unsaturateda ldehydes. X-ray photoelectrons pectroscopy revealed that ah ighr atio of metallicP ti nt he Pt 1.5 Sn NWs boosted the conversion of CAL and that ah igh Sn content favored the hydrogenation of the C=Ob ond, both of which lead to excellent activity and selectivity.

Iridium (Ir) holds great promise for ethanol oxidation reaction (EOR), while its practical applications suffer from the limited shape-controlled synthesis due to its low-energy barrier for nucleation. To overcome this limitation, the preparation of a new class of ultrathin vein-like Ir-tin nanowires (IrSn NWs) with abundant oxidized Sn is reported. By tuning the ratio of Ir to Sn, the optimized Ir Sn /C exhibits the highest mass density of 95.6 mA mg Ir for EOR at low potential (0.04 V), which is 4.1-fold and 20-fold higher than that of Ir/C and the commercial Pt/C, respectively. It also exhibits the smallest Tafel slope of 153 mV dec and superior stability after 2 h chronoamperometric measurement. Electrochemical measurements and X-ray photoelectron spectra results confirm that the abundant oxidized Sn promotes a complete oxidization of ethanol into CO at low potential. This work highlights the importance of non-noble metal on enhancing the EOR performance.