Journal
CHEMSUSCHEM
Volume 7, Issue 12, Pages 3459-3466Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402474
Keywords
carbon dioxide capture; IR spectroscopy; operando spectroscopy; sorbent; surface chemistry
Funding
- Department of Energy (DOE) [DE-PS26-O4NT-42454]
- Pennsylvania Infrastructure Technology Alliance (PITA) [PITA-442-04, PITA-542-5]
- NSF-REU [0609018]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0609018] Funding Source: National Science Foundation
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The separation, capture, and storage of CO2, the major greenhouse gas, from industrial gas streams has received considerable attention in recent years because of concerns about environmental effects of increasing CO2 concentration in the atmosphere. An emerging area of research utilizes reversible CO2 sorbents to increase conversion and rate of forward reactions for equilibrium-controlled reactions (sorption-enhanced reactions). Little fundamental information, however, is known about the nature of the sorbent surface sites, sorbent surface-CO2 complexes, and the CO2 adsorption/desorption mechanisms. The present study directly spectroscopically monitors Na2O/Al2O3 sorbent-CO2 surface complexes during adsorption/desorption with simultaneous analysis of desorbed CO2 gas, allowing establishment of molecular level structure-sorption relationships between individual surface carbonate complexes and the CO2 working capacity of sorbents at different temperatures.
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