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Utilization of alumina-supported K2CO3 as CO2-selective sorbent: A promising strategy to mitigate the carbon footprint of the maritime sector
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2017-12-30 , DOI: 10.1016/j.jcou.2017.12.014
Alessandro Erto , Marco Balsamo , Liana Pasqualina Paduano , Amedeo Lancia , Francesco Di Natale

This paper investigates the application of K2CO3 supported onto porous alumina, as sorbent for selective CO2 capture in marine applications. Alumina-functionalized sorbents were prepared by incipient wetness impregnation achieving K2CO3 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. CO2, 5% vol. H2O, balance N2). 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 K2CO3, which is affected by significant intraparticle diffusion limitations. Steam regeneration tests performed in a fixed-bed column on the sorbent with 3.6% wt K2CO3 loading revealed that a temperature of 120 °C assures almost complete recovery of captured CO2 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 SO2 removal. The proposed unit appeared able to cut up to 30% carbon dioxide emission by using the sorbent containing 3.6% wt K2CO3 and operating the carbonation and regeneration stage at 60 and 120 °C, respectively.



中文翻译:

氧化铝负载的K 2 CO 3作为CO 2选择性吸附剂的应用:减轻海事部门碳足迹的一种有前途的策略

本文研究了负载在多孔氧化铝上的K 2 CO 3作为吸附剂在海洋应用中选择性捕获CO 2的应用。通过初期湿润浸渍来制备氧化铝官能化的吸附剂,以使K 2 CO 3的负载量为3.6至14.1 wt%。碳化试验是在固定床塔中于60至105°C之间的温度下进行的,通常在洗涤器和/或废热回收装置的出口进行,并使用柴油机排气模型(5%体积的CO)。2,体积H 2 O的5%,平衡N 2)。根据碳酸盐的负载量,吸附剂可以达到高达90%的碳酸盐转化率和高达0.66 mol kg -1吸附剂的总捕获能力。实验数据显示,与不受支持的K 2 CO 3相比,其转化度和捕获能力更高,而K 2 CO 3受到明显的颗粒内扩散限制。在固定床色谱柱上吸附量为3.6%wt K 2 CO 3的吸附剂上进行的蒸汽再生测试表明,120°C的温度可确保几乎完全回收捕获的CO 2同时保持吸附剂碳酸化度连续10次碳酸/再生循环。进行了船上安装的变温碳酸化/再生装置的初步设计,以对某客船进行参考案例研究,该客船配备了4.35 MW船用柴油机,该船用柴油供船用瓦斯油,并配有商用海水洗涤塔,用于去除SO 2。。通过使用包含3.6%wt K 2 CO 3的吸附剂并分别在60和120°C下运行碳酸化和再生阶段,拟议的装置似乎能够减少多达30%的二氧化碳排放。

更新日期:2017-12-30
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