In this work, an alloy catalyst with C@PtGa interface structure was synthesized under H₂/CO₂ atmosphere by using PtCl₆²⁻/MgAlGa-LDHs as precursor. Cs-corrected STEM, EELS and CO chemisorption clearly confirmed the PtGa alloy particles were well covered by amorphous carbon thin layer with the characteristics of porous and permeable. In selective cinnamaldehyde hydrogenation, the C@PtGa catalyst showed a higher selectivity than both bare PtGa catalyst and Ga₂O₃@PtGa catalyst. The enhanced selectivity was attributed to the geometric decoration of carbon layer as well as the formation of electron-rich Pt sites at C@PtGa interface, which optimized the adsorption mode of cinnamaldehyde. More importantly, the permeable characteristic of carbon layer which maintained the accessibility of reactants to the Pt sites, contributed to the higher conversion compared to Ga₂O₃@PtGa catalysts with traditional oxide interface layer. Additionally, C@PtGa catalyst exhibited a good reusability with conversion of 88.3% and selectivity of 91.9% after 5 cycles. This work provides an alternative way to realize the boost of activity and selectivity in selective hydrogenation of C=O bonds by intelligently fabricating non-oxides@metal interface.

本文以PtCl ₆ ^2- / MgAlGa-LDHs为前驱体，在H ₂ / CO ₂气氛下合成了具有C @ PtGa界面结构的合金催化剂。Cs校正的STEM，EELS和CO化学吸附清楚地证明了PtGa合金颗粒被非晶碳薄层很好地覆盖，具有多孔和可渗透的特性。在选择性肉桂醛加氢中，C @ PtGa催化剂的选择性高于裸PtGa催化剂和Ga ₂ O _3。@PtGa催化剂。选择性的提高归因于碳层的几何装饰以及在C @ PtGa界面形成富电子的Pt位点，从而优化了肉桂醛的吸附方式。更重要的是，与具有传统氧化物界面层的Ga ₂ O ₃ @PtGa催化剂相比，碳层的渗透性（保持了反应物到Pt部位的可及性）有助于更高的转化率。另外，C @ PtGa催化剂在5个循环后表现出良好的可重复使用性，转化率为88.3％，选择性为91.9％。这项工作提供了另一种方法，可以通过智能地制造non-oxides @ metal界面来实现C = O键选择性加氢中活性和选择性的提高。