Direct Observation of Ammonia Storage in UiO-66 Incorporating Cu(II) Binding Sites.

ABSTRACT: The presence of active sites in metal-organic framework (MOF) materials can control and affect their performance significantly in adsorption and catalysis. However, revealing the interactions between the substrate and active sites in MOFs at atomic precision remains a challenging task. Here, we report the direct observation of binding of NH₃ in a series of UiO-66 materials containing atomically dispersed defects and open Cu(I) and Cu(II) sites. While all MOFs in this series exhibit similar surface areas (1111-1135 m² g^-1), decoration of the -OH site in UiO-66-defect with Cu(II) results in a 43% enhancement of the isothermal uptake of NH₃ at 273 K and 1.0 bar from 11.8 in UiO-66-defect to 16.9 mmol g^-1 in UiO-66-Cu^II. A 100%

SUBMITTER: Ma Y 

PROVIDER: S-EPMC9121371 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature