{"title":"通过简单的干法球磨和 K2CO3 物理添加,在 Li4SiO4 吸附剂上实现二氧化碳的高温捕获","authors":"","doi":"10.1016/j.ccst.2024.100255","DOIUrl":null,"url":null,"abstract":"<div><p>The reversible CO<sub>2</sub> absorption/desorption of lithium orthosilicate (Li<sub>4</sub>SiO<sub>4</sub>) sorbents holds potential for high temperature capture of CO<sub>2</sub> from hot flue gases, sorption-enhanced reforming and solar thermochemical energy storage. In this study, we have prepared a series of Li<sub>4</sub>SiO<sub>4</sub> sorbents using a combination of K<sub>2</sub>CO<sub>3</sub> addition and dry ball-milling procedure to improve the relatively slow kinetics under low CO<sub>2</sub> partial pressure conditions. The synergistic effects of dry ball-milling and K<sub>2</sub>CO<sub>3</sub> addition on the intrinsic properties of Li<sub>4</sub>SiO<sub>4</sub> sorbents were explored by thermogravimetric analysis and structural characterizations. Thermogravimetric analysis indicate that the highest CO<sub>2</sub> uptakes were achieved with dry ball-milling combined with K<sub>2</sub>CO<sub>3</sub> physical addition. The structural characterizations further reveal that this sorbent (P-3K-1.5 M) had the smallest crystallite/particle size, largest surface area, and highest availability of surface alkaline-sites. The kinetics analysis also demonstrates that P-3K-1.5 M exhibited the fastest sorption kinetics during a double process. Additionally, P-3K-1.5 M maintained a high capacity over 10 sorption/desorption cycles. Therefore, this synthesis technique, which is simple, cost-effective, and easily scalable, shows great promise for high-temperature CO<sub>2</sub> capture.</p></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772656824000678/pdfft?md5=adfef578d323d28b515a25799f8a22e8&pid=1-s2.0-S2772656824000678-main.pdf","citationCount":"0","resultStr":"{\"title\":\"High temperature capture of CO2 on Li4SiO4 sorbents via a simple dry ball-milling coupled with K2CO3 physical addition\",\"authors\":\"\",\"doi\":\"10.1016/j.ccst.2024.100255\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The reversible CO<sub>2</sub> absorption/desorption of lithium orthosilicate (Li<sub>4</sub>SiO<sub>4</sub>) sorbents holds potential for high temperature capture of CO<sub>2</sub> from hot flue gases, sorption-enhanced reforming and solar thermochemical energy storage. In this study, we have prepared a series of Li<sub>4</sub>SiO<sub>4</sub> sorbents using a combination of K<sub>2</sub>CO<sub>3</sub> addition and dry ball-milling procedure to improve the relatively slow kinetics under low CO<sub>2</sub> partial pressure conditions. The synergistic effects of dry ball-milling and K<sub>2</sub>CO<sub>3</sub> addition on the intrinsic properties of Li<sub>4</sub>SiO<sub>4</sub> sorbents were explored by thermogravimetric analysis and structural characterizations. Thermogravimetric analysis indicate that the highest CO<sub>2</sub> uptakes were achieved with dry ball-milling combined with K<sub>2</sub>CO<sub>3</sub> physical addition. The structural characterizations further reveal that this sorbent (P-3K-1.5 M) had the smallest crystallite/particle size, largest surface area, and highest availability of surface alkaline-sites. The kinetics analysis also demonstrates that P-3K-1.5 M exhibited the fastest sorption kinetics during a double process. Additionally, P-3K-1.5 M maintained a high capacity over 10 sorption/desorption cycles. Therefore, this synthesis technique, which is simple, cost-effective, and easily scalable, shows great promise for high-temperature CO<sub>2</sub> capture.</p></div>\",\"PeriodicalId\":9387,\"journal\":{\"name\":\"Carbon Capture Science & Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-08-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2772656824000678/pdfft?md5=adfef578d323d28b515a25799f8a22e8&pid=1-s2.0-S2772656824000678-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Carbon Capture Science & Technology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2772656824000678\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Capture Science & Technology","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772656824000678","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
正硅酸锂(Li4SiO4)吸附剂对二氧化碳的可逆吸收/解吸为高温烟气中二氧化碳的高温捕集、吸附增强重整和太阳能热化学储能提供了潜力。在本研究中,我们采用添加 K2CO3 和干法球磨相结合的方法制备了一系列 Li4SiO4 吸附剂,以改善其在低二氧化碳分压条件下相对较慢的动力学特性。通过热重分析和结构表征,探讨了干法球磨和添加 K2CO3 对 Li4SiO4 吸附剂内在性质的协同效应。热重分析表明,干法球磨结合 K2CO3 物理添加可实现最高的二氧化碳吸收率。结构表征进一步表明,这种吸附剂(P-3K-1.5 M)的结晶/颗粒尺寸最小,比表面积最大,表面碱性位点的可用性最高。动力学分析还表明,P-3K-1.5 M 在双重过程中表现出最快的吸附动力学。此外,P-3K-1.5 M 还能在 10 次吸附/解吸循环中保持较高的吸附容量。因此,这种合成技术简单、成本效益高且易于扩展,在高温捕获二氧化碳方面大有可为。
High temperature capture of CO2 on Li4SiO4 sorbents via a simple dry ball-milling coupled with K2CO3 physical addition
The reversible CO2 absorption/desorption of lithium orthosilicate (Li4SiO4) sorbents holds potential for high temperature capture of CO2 from hot flue gases, sorption-enhanced reforming and solar thermochemical energy storage. In this study, we have prepared a series of Li4SiO4 sorbents using a combination of K2CO3 addition and dry ball-milling procedure to improve the relatively slow kinetics under low CO2 partial pressure conditions. The synergistic effects of dry ball-milling and K2CO3 addition on the intrinsic properties of Li4SiO4 sorbents were explored by thermogravimetric analysis and structural characterizations. Thermogravimetric analysis indicate that the highest CO2 uptakes were achieved with dry ball-milling combined with K2CO3 physical addition. The structural characterizations further reveal that this sorbent (P-3K-1.5 M) had the smallest crystallite/particle size, largest surface area, and highest availability of surface alkaline-sites. The kinetics analysis also demonstrates that P-3K-1.5 M exhibited the fastest sorption kinetics during a double process. Additionally, P-3K-1.5 M maintained a high capacity over 10 sorption/desorption cycles. Therefore, this synthesis technique, which is simple, cost-effective, and easily scalable, shows great promise for high-temperature CO2 capture.