Flame-made durable doped-CaO nanosorbents for CO{sub 2} capture
- University of Cincinnati, OH (USA). Chemical and Materials Engineering Department
The present study deals with the design and development of novel calcium-oxide-based refractory sorbents synthesized by flame spray pyrolysis (FSP) for carbon dioxide capture. The FSP-derived sorbents inherently exhibit very large CO{sub 2} uptake capacity in the present investigation. Sorbents derived from conventional wet chemistry, possessing identical composition, were synthesized and evaluated. A wide range of refractory dopants (Si, Ti, Cr, Co, Zr, and Ce) were employed, aiming at developing sorbents with good mechanical strength. Among all of the doped CaO sorbents, Zr-doped CaO was found to exhibit the best CO{sub 2}-capture performance under identical conditions of operation. To study the effect of Zr in depth and find out the optimal concentration of Zr needed in the CaO matrix, a series of Zr-incorporated CaO sorbents were synthesized by varying the relative composition of Zr in the CaO base matrix. The present studies suggest that Zr/Ca in the 3:10 atomic ratio results in the formation of the most robust nanosorbent for multicyclic operation. This sorbent retained, unchanged, its ability to capture CO{sub 2} during extended cycles. It also demonstrated excellent stability under operating in the presence of water vapor (10 vol %). The present paper represents two novel developments in the field of CO{sub 2} capture, first, the superiority of FSP process and, second, the role of ZrO{sub 2} dopant in improving the durability and robustness of the CaO-based sorbent. 29 refs., 11 figs., 3 tabs.
- OSTI ID:
- 21162112
- Journal Information:
- Energy and Fuels, Vol. 23, Issue 2; Other Information: panagiotis.smirniotis@uc.edu; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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