Carbon Capture by Metal Oxides: Unleashing the Potential of the (111) Facet
| Autor: | Ryan M. Richards, James A. Anderson, Cristian V. Ciobanu, Greg A. Mutch, David Vega-Maza, Sarah Shulda, Martin J. Menart, Chilan Ngo, Alan J. McCue |
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| Rok vydání: | 2018 |
| Předmět: |
Facet (geometry)
Sorbent Sintering chemistry.chemical_element High capacity 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Catalysis Solid metal 0104 chemical sciences Metal Colloid and Surface Chemistry Adsorption chemistry Chemical engineering visual_art visual_art.visual_art_medium 0210 nano-technology Carbon |
| Zdroj: | Journal of the American Chemical Society. 140:4736-4742 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.8b01845 |
| Popis: | Solid metal oxides for carbon capture exhibit reduced adsorption capacity following high-temperature exposure, due to surface area reduction by sintering. Furthermore, only low-coordinate corner/edge sites on the thermodynamically stable (100) facet display favorable binding toward CO2, providing inherently low capacity. The (111) facet, however, exhibits a high concentration of low-coordinate sites. In this work, MgO(111) nanosheets displayed high capacity for CO2, as well as a ∼65% increase in capacity despite a ∼30% reduction in surface area following sintering (0.77 mmol g–1 @ 227 m2 g–1 vs 1.28 mmol g–1 @ 154 m2 g–1). These results, unique to MgO(111), suggest intrinsic differences in the effects of sintering on basic site retention. Spectroscopic and computational investigations provided a new structure–activity insight: the importance of high-temperature activation to unleash the capacity of the polar (111) facet of MgO. In summary, we present the first example of a faceted sorbent for carbon captu... |
| Databáze: | OpenAIRE |
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