In this work, we investigated the catalytic performance of uni- and bimodal Pd/SiO₂ catalysts in the aqueous phase hydrodechlorination (HDC) of diclofenac – a very popular nonsteroidal anti-inflammatory drug. Unimodality and bimodality was confirmed by temperature-programmed hydride decomposition (TPHD) and TEM. The highest activity and 100% efficiency in batch and flow mode were observed for bimodal Pd NPs. This outstanding efficiency could be attributed to the close coexistence of small and large metal nanoparticles with different affinity to hydrogen and chloroorganic compound. The obtained results encourage discussion on the necessity to strive for perfect unimodal catalysts for the HDC processes.

在这项工作中，我们研究了单峰和双峰Pd / SiO ₂催化剂在双氯芬酸（一种非常受欢迎的非甾体类抗炎药）的水相加氢脱氯（HDC）中的催化性能。通过程序升温氢化物分解（TPHD）和TEM证实了单峰和双峰。对于双峰Pd NP，在批处理和流动模式下观察到最高的活性和100％的效率。这种出色的效率可归因于对氢和氯有机化合物具有不同亲和力的大小金属纳米颗粒的紧密共存。获得的结果鼓励人们讨论为HDC工艺争取完美的单峰催化剂的必要性。