Stability Effects on CO2 Adsorption for the DOBDC Series of Metal–Organic Frameworks

• Published in: Langmuir Vol. 27; no. 18; pp. 11451 - 11456
• Main Authors: Liu, Jian, Benin, Annabelle I, Furtado, Amanda M. B, Jakubczak, Paulina, Willis, Richard R, LeVan, M. Douglas
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 20.09.2011
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; Interfaces: Adsorption, Reactions, Films, Forces; Surface physical chemistry; Metal organic framework; Stability; Crystals; Carbon dioxide; Adsorption capacity; Nitrogen; Water vapor; Drop; Chemical reduction; Storage; Adsorption; Isotherm; Adsorbent; Surface area; Structure; Room temperature
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la201774x

Metal–organic frameworks with unsaturated metal centers in their crystal structures, such as Ni/DOBDC and Mg/DOBDC, are promising adsorbents for carbon dioxide capture from flue gas due to their high CO2 capacities at subatmospheric pressures. However, stability is a critical issue for their application. In this paper, the stabilities of Ni/DOBDC and Mg/DOBDC are investigated. Effects of steam conditioning, simulated flue gas conditioning, and long-term storage on CO2 adsorption capacities are considered. Results show that Ni/DOBDC can maintain its CO2 capacity after steam conditioning and long-term storage, whereas Mg/DOBDC does not. Nitrogen isotherms for Mg/DOBDC show a drop in surface area after steaming, corresponding to the decrease in CO2 adsorption, which may be caused by a reduction of unsaturated metal centers in its structure. Conditioning with dry simulated flue gas at room temperature only slightly affects CO2 adsorption in Ni/DOBDC. However, introducing water vapor into the simulated flue gas further reduces the CO2 capacity of Ni/DOBDC.