High-Capacity, Cooperative CO₂ Capture in a Diamine-Appended Metal-Organic Framework through a Combined Chemisorptive and Physisorptive Mechanism.

ABSTRACT: Diamine-appended Mg₂(dobpdc) (dobpdc^4- = 4,4'-dioxidobiphenyl-3,3'-dicarboxylate) metal-organic frameworks are promising candidates for carbon capture that exhibit exceptional selectivities and high capacities for CO₂. To date, CO₂ uptake in these materials has been shown to occur predominantly via a chemisorption mechanism involving CO₂ insertion at the amine-appended metal sites, a mechanism that limits the capacity of the material to ∼1 equiv of CO₂ per diamine. Herein, we report a new framework, pip2-Mg₂(dobpdc) (pip2 = 1-(2-aminoethyl)piperidine), that exhibits two-step CO₂ uptake and achieves an unusually high CO₂ capacity approaching 1.5 CO₂ per diamine at saturation. Analys

SUBMITTER: Zhu Z 

PROVIDER: S-EPMC10921408 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature