A reduction in CO₂ emissions is required to mitigate global warming. Post-combustion carbon capture is one of the most developed technologies that has the potential to meet this goal, but its cost prevents its widespread use. A different approach would be to use CO₂ directly as it is captured, before it is stored. Here we explore spontaneous CO₂ fixation by industrial polyamines as a strategy to generate dynamic libraries of ligands for metal separation and recovery. We identify the CO₂ loadings and solvents promoting the optimal precipitation of each metal from the dynamic libraries of complexes. We demonstrate the separation of lanthanum and nickel using the exhaust gas of an internal combustion engine vehicle, and show that the three metal constituents of the La₂Ni₉Co alloys used to manufacture the batteries of electric vehicles can be separated and recovered by successive CO₂-induced selective precipitations. Beyond the concept of CO₂-sourced multi-level dynamic coordination chemistry, this study provides a potential framework for integrated CO₂ capture and use through sustainable processes.

为了缓解全球变暖，需要减少 CO _{2排放量。}燃烧后碳捕获是最发达的技术之一，有可能实现这一目标，但其成本阻碍了其广泛使用。一种不同的方法是在 CO ₂被捕获之前直接使用它，然后再进行储存。在这里，我们探索工业多胺的自发 CO ₂固定，作为生成用于金属分离和回收的动态配体库的策略。我们识别 CO ₂负载和溶剂促进每种金属从配合物的动态库中最佳沉淀。我们演示了利用内燃机汽车的废气分离镧和镍，并表明用于制造电动汽车电池的 La ₂ Ni ₉ Co 合金的三种金属成分可以通过连续的 CO 分离和回收₂诱导的选择性沉淀。除了 CO ₂来源的多级动态配位化学的概念之外，本研究还为通过可持续过程进行的综合 CO _{2捕获和使用提供了一个潜在的框架。}