We present a highly selective and active Pd carbon catalyst prepared by an easy hydrothermal synthesis method. This synthetic procedure allows the stabilization under mild conditions of interstitial carbon atoms on the surface of a Pd⁰ carbon catalyst. The so formed Pd carbide phase appears on the upper surface layers of the Pd carbon catalyst, as demonstrated by X-ray photoelectron depth profile analysis using variable synchrotron X-ray energies. The presence of carbon in the palladium carbide species modifies the electronic state of surface Pd atoms, resulting in more electron positive Pd species (Pd^δ+). This influences the adsorption of reactants and reaction intermediates during the hydrogenation of alkynes, dienes and imines, resulting in high selectivities at practically 100% conversion.

我们提出了一种通过选择性水热合成方法制备的高选择性和活性钯碳催化剂。该合成程序允许在温和条件下稳定Pd ⁰碳催化剂表面上的间隙碳原子。如此形成的Pd碳化物相出现在Pd碳催化剂的上表面层上，如使用可变同步加速器X射线能量的X射线光电子深度分布分析所证明的。碳化钯物质中碳的存在会改变表面Pd原子的电子状态，从而导致更多的正电子Pd物质（Pdδ ⁺）。这会影响炔烃，二烯和亚胺的氢化过程中反应物和反应中间体的吸附，从而在几乎100％的转化率下产生高选择性。