微波法制备还原氧化石墨烯负载Pt_3Co纳米合金(英文)

Microwave-assisted fast fabrication of a nanosized Pt_3Co alloy on reduced graphene oxides

微波辐射法可以在数分钟内将高度分散的Pt3Co合金颗粒负载于还原氧化石墨烯表面上.表征结果发现,与传统的溶剂热法和浸渍法相比,微波法制备的催化剂中贵金属的利用率高,合金颗粒的分布均匀,组成可控,同时氧化石墨烯的再石墨化现象也得到有效地抑制.采用微波法制备的Pt3Co/RGO-MW催化剂在肉桂醛加氢反应中具有较高的活性和和产物选择性.Pt3Co/RGO-MW中每一个Pt原子在70℃的转化频率高达23.8 min-1.

Ultrafine and homogenously dispersed Pt3Co alloy nanoparticles were fabricated on reduced gra‐phene oxide （RGO） in a few minutes under microwave irradiation. Characterization results con‐firmed that microwave irradiation was important for higher metal utilization, the easy control of alloy composition, improved dispersion of the Pt3Co particles and minimizing the re‐graphitization of the parent RGO by comparison with conventional solvent‐thermal and impregnation methods. This Pt3Co/RGO‐MW catalyst was extremely active and selective during the hydrogenation of cin‐namaldehyde to cinnamyl alcohol. The calculated specific activity of each Pt atom in the Pt3Co/RGO‐MW at 70 °C was 23.8 min–1.