Selective Hydrogenation of Cinnamaldehyde to Cinnamal Alcohol over Platinum/Graphene Catalysts
作者:Xiwang Ji、Xiaoyu Niu、Bo Li、Qing Han、Fulong Yuan、Francisco Zaera、Yujun Zhu、Honggang Fu
DOI:10.1002/cctc.201402573
日期:2014.11
all X wt %Pt/G and 3.5 wt %Pt/VC catalysts, cinnamal alcohol was produced with high selectivity only with the graphene‐supported catalysts: 92 % conversion and 88 % selectivity toward cinnamal alcohol were obtained with 3.5 wt %Pt/G. This catalyst also showed good stability in recycling tests. The good selectivity observed with the graphene‐based catalysts is attributed to the higher fraction of reduced
制备了由分散在石墨烯上的Pt纳米颗粒制成的催化剂(X wt%Pt / G,X = 2.0、3.5和5.0),并通过XRD,拉曼光谱,BET表面积测量,TEM和X射线光电子能谱(XPS)进行了表征),并且包括在Vulcan Carbon催化剂上的3.5 wt%Pt(3.5 wt%Pt / VC)作为参考。尽管所有X的平均Pt纳米颗粒尺寸约为4.4 nm wt%Pt / G和3.5 wt%Pt / VC催化剂,仅用石墨烯负载的催化剂才能高选择性地生产肉桂醇:3.5 wt%Pt / G可获得92%的转化率和88%的肉桂醇选择性。该催化剂在循环测试中也显示出良好的稳定性。在石墨烯基催化剂上观察到的良好的选择性归因于在Pt纳米颗粒表面上观察到的较高的还原表面Pt 0原子分数(由XPS确定)。这种解释与DFT计算是一致的。肉桂醛和石墨烯之间的其他π-π相互作用也可能在肉桂醛的选择性加氢中起作用。