Transition metal catalysis has, over recent decades, developed into one of the most important methods of constructing molecules. However, although efficient in the construction of complex molecules, these catalysts can be expensive as they are often based upon second- and third-row transition metals which have, for the most part, low terrestrial abundance. Present removal and recovery techniques for homogeneous catalysts tend, at best, to focus on recovering the metal center and to consider ligands as single-use components. Recovery of the whole catalyst would be more beneficial from economic and environmental points of view.

中文翻译：

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膜分离与金催化炔丙基胺羧化环化相结合，有机溶剂纳滤回收催化剂

近几十年来，过渡金属催化已发展成为构建分子的最重要方法之一。然而，尽管在构建复杂分子方面很有效，但这些催化剂可能很昂贵，因为它们通常基于第二和第三行过渡金属，这些金属在大多数情况下具有低的地球丰度。目前用于均相催化剂的去除和回收技术充其量倾向于专注于回收金属中心并将配体视为一次性组分。从经济和环境的角度来看，整个催化剂的回收将更有利。