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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tanthana, Jak Chuang, Steven S. C. |
| Description | Country affiliation: United States Author Affiliation: Tanthana J ( FirstEnergy Advanced Energy Research Center, Department of Chemical and Biomolecular Engineering, The University of Akron, OH 44325-3906, USA.) |
| Abstract | The $CO_{2}$ capture capacity, adsorption mechanism, and degradation characteristics of two sorbents, silica-supported tetraethylenepentamine $(TEPA/SiO_{2})$ and polyethylene-glycol-modified $TEPA/SiO_{2}$ $(PEG/TEPA/SiO_{2}),$ are studied by diffuse reflectance infrared Fourier transform spectroscopy and mass spectrometry. The $CO_{2}$ capture capacities of $TEPA/SiO_{2}$ and $PEG/TEPA/SiO_{2}$ are determined to be 2087 and $1110 μmol CO_{2} g^{−1} sorbent,$ respectively. Both sorbents adsorb $CO_{2}$ as hydrogen-bonding species, $NH_{2}O,$ and carbamate/carboxylate species. The $CO_{2}$ adsorption half-time increases with the number of $CO_{2}$ capture cycles. Infrared results suggest that the increased adsorption half-time is a result of diffusion limitation, caused by accumulation of TEPA and PEG species on the surface of the sorbent particles. The degradation of $TEPA/SiO_{2}$ is found to correlate with the accumulation of carboxylate/carbamic species. The addition of PEG decreases the degradation rate of the sorbent and slows down the formation of carboxylate species. These carboxylate species can block $CO_{2}$ capture on amine $(NH_{2}/NH)$ sites. The stabilizing role of PEG on $TEPA/SiO_{2}$ can be attributed to hydrogen-bonding between TEPA $(NH_{2}/NH)and$ PEG (OH). |
| File Format | HTM / HTML |
| ISSN | 18645631 |
| Issue Number | 8 |
| Volume Number | 3 |
| e-ISSN | 1864564X |
| Journal | ChemSusChem |
| Language | English |
| Publisher | Wiley-VCH |
| Publisher Date | 2010-08-23 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Research Support, U.s. Gov't, Non-p.h.s. Chemistry Amines Spectrophotometry, Infrared Polyethylene Glycols Silicon Dioxide Mass Spectrometry Discipline Sustainable Chemistry Isolation & Purification Carbon Sequestration Carbon Dioxide Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Energy Environmental Chemistry Materials Science Chemical Engineering |
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