Comparing Separation <i>vs</i>. Fresh Start to Assess Reusability of Pd/C Catalyst in Liquid‐Phase Hydrogenation
R. M. Mironenko, Elina R. Saybulina, М. В. Тренихин, Р. Р. Измайлов, Кристина А. Лоцман, Konstantin S. Rodygin, Valentine P. Ananikov
Abstract
Abstract The reusability of metal catalysts is a key issue for the potential application of new catalysts in research and industrial practice. The most common procedure for testing catalyst reusability in liquid‐phase heterogeneous reactions is based on separating a catalyst from a reaction mixture followed by the next run. An alternative procedure called “fresh start” consists of the addition of a new portion of reagents to the reaction mixture without any isolation operation. In this work, we compare both procedures in a model Pd/C‐catalyzed hydrogenation with different heteroatoms, e. g ., O‐, S‐, and N‐vinyl derivatives. It was shown that regardless of whether the catalyst is stable or potentially poisoned during the reaction, both procedures lead to comparable results. It appears that a much easier implementation of a fresh start procedure may be an option of choice. The possibilities of using both procedures to rationalize the experimental protocol for assessing Pd/C catalyst reusability in liquid‐phase hydrogenations are discussed.