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An inside look at a MOF in action
Date:11/22/2013

A unique inside look at the electronic structure of a highly touted metal-organic framework (MOF) as it is adsorbing carbon dioxide gas should help in the design of new and improved MOFs for carbon capture and storage. Researchers with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab) have recorded the first in situ electronic structure observations of the adsorption of carbon dioxide inside Mg-MOF-74, an open metal site MOF that has emerged as one of the most promising strategies for capturing and storing greenhouse gases.

Working at Berkeley Lab's Advanced Light Source (ALS), a team led by Jeff Kortright of Berkeley Lab's Materials Sciences Division, used the X-ray spectroscopy technique known as Near Edge X-ray Absorption Fine Structure (NEXAFS) to obtain what are believed to be the first ever measurements of chemical and electronic signatures inside of a MOF during gas adsorption.

"We've demonstrated that NEXAFS spectroscopy is an effective tool for the study of MOFs and gas adsorption," Kortright says. "Our study shows that open metal site MOFs have significant X-ray spectral signatures that are highly sensitive to the adsorption of carbon dioxide and other molecules."

Kortright is the corresponding author of a paper describing these results in the Journal of the American Chemical Society (JACS). The paper is titled "Probing Adsorption Interactions In Metal-Organic Frameworks Using X-ray Spectroscopy." Co-authors are Walter Drisdell, Roberta Poloni, Thomas McDonald, Jeffrey Long, Berend Smit, Jeffrey Neaton and David Prendergast.

Carbon dioxide gas released during the burning of coal is one of the primary greenhouse gases responsible for exacerbating global climate change. However, with the world's largest estimated recoverable reserves of coal, the United States will continue to rely on coal-burning power plants to generate electricity for the foreseeable future. Th
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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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