There is much about the action of bismuth within heterogeneous catalysis that still require a deeper understanding. We observed that, when Bi was added to AuPd bimetallic nanoparticles (NPs) supported on activated carbon, Bi affected the activity and significantly alters the selectivity in two model liquid phase reactions, namely the oxidation of cinnamyl alcohol and the hydrogenation of cinnamaldehyde. A combination of transmission electron microscopy and X-ray absorption spectroscopy provided a detailed characterization of trimetallic AuPdBi systems. We propose that the introduction of bismuth on AuPd NPs results in a partial blockage of most active sites, limiting the occurrence of consecutive reactions.

关于铋在多相催化中的作用还有很多需要更深入的了解。我们观察到，当将 Bi 添加到负载在活性炭上的 AuPd 双金属纳米粒子 (NPs) 中时，Bi 会影响活性并显着改变两种模型液相反应的选择性，即肉桂醇的氧化和肉桂醛的氢化。透射电子显微镜和 X 射线吸收光谱的组合提供了三金属 AuPdBi 系统的详细表征。我们建议在 AuPd NPs 上引入铋会导致大多数活性位点的部分阻塞，从而限制了连续反应的发生。