Utilization of alumina-supported K2CO3as CO2-selective sorbent: A promising strategy to mitigate the carbon footprint of the maritime sector
| Autor: | Marco Balsamo, Francesco Di Natale, Liana P. Paduano, Amedeo Lancia, Alessandro Erto |
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| Přispěvatelé: | Erto, Alessandro, Balsamo, Marco, Paduano, LIANA PASQUALINA, Lancia, Amedeo, Di Natale, Francesco |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Supported sorbent
Sorbent Materials science Carbonation Naval sector Scrubber 02 engineering and technology 010402 general chemistry Diesel engine 01 natural sciences Waste heat recovery unit chemistry.chemical_compound Chemical Engineering (miscellaneous) Waste Management and Disposal Incipient wetness impregnation Process Chemistry and Technology Fixed-bed scale-up Fuel oil 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering Potassium carbonate CO2capture Carbon dioxide 0210 nano-technology |
| Popis: | This paper investigates the application of K 2 CO 3 supported onto porous alumina, as sorbent for selective CO 2 capture in marine applications. Alumina-functionalized sorbents were prepared by incipient wetness impregnation achieving K 2 CO 3 loadings from 3.6 to 14.1% wt. Carbonation tests were performed in a fixed-bed column at temperatures between 60 and 105 °C, as those typically occurring at the outlet of a scrubber and/or a waste heat recovery unit, with a model diesel engine exhaust (5% vol. CO 2 , 5% vol. H 2 O, balance N 2 ). According to the carbonate loading, the sorbents may reach conversion degrees of carbonate up to 90% and overall capture capacity up to 0.66 mol kg −1 sorbent. Experimental data showed higher conversion degree and capture capacity compared with unsupported K 2 CO 3 , which is affected by significant intraparticle diffusion limitations. Steam regeneration tests performed in a fixed-bed column on the sorbent with 3.6% wt K 2 CO 3 loading revealed that a temperature of 120 °C assures almost complete recovery of captured CO 2 while preserving the sorbent carbonation degree for 10 consecutive carbonation/regeneration cycles. The preliminary design of a temperature swing carbonation/regeneration unit for on-board ship installation was performed for the reference case study of a passenger ship equipped with a 4.35 MW marine engine fueled with marine gas oil and with a commercial seawater scrubber for SO 2 removal. The proposed unit appeared able to cut up to 30% carbon dioxide emission by using the sorbent containing 3.6% wt K 2 CO 3 and operating the carbonation and regeneration stage at 60 and 120 °C, respectively. |
| Databáze: | OpenAIRE |
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