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{"title":"CO2 capture performance of a CaO sorbent modified with fulvic acid for the calcium looping cycle","authors":"Dazhan Jiang, Yaru Wang, Zetong Li, Shuaipeng Li, Li Zhang, Luhan Chen, Zhiguo Sun","doi":"10.1002/ghg.2213","DOIUrl":null,"url":null,"abstract":"<p>Capturing CO<sub>2</sub> from fossil fuel combustion is of importance for mitigation of climate warming. Among the CO<sub>2</sub> capture technologies, the calcium-based sorbent method is promising. However, the most prominent problem of this method at present is that the activity of the sorbent decreases as the number of cycle reactions increases. It seriously affects the industrial application of the calcium-based sorbent method in carbon capture technology. Fulvic acid (FA) is a biologically active and soluble component of humic acid. Compared with other humic acids, it contains more oxygen and heterocyclic rings. Also, the rings are connected by bridge bonds. Therefore, the ability of FA to chelate cations and its adsorption capacity is stronger than the other humic acids. Therefore, in this work, we first proposed using FA to modify CaO to improve CO<sub>2</sub> capture from flue gas. The effects of calcination temperature, carbonation temperature, reaction time and the amount of doped FA on the carbonation conversion rate (CCR) of CaO modified with FA (FA/CaO) were studied in the calcining/carbonizing room at atmospheric pressure. The experiment showed that the first CCR (<i>X</i><sub>1</sub>) of FA/CaO reached 0.872 under the optimal conditions, which was 31% higher than <i>X</i><sub>1</sub> of original CaO. The 20th CCR (<i>X</i><sub>20</sub>) was still as high as 0.47, which was three times than <i>X</i><sub>20</sub> of original CaO. In addition, the sorbent was analyzed and characterized by XRD, SEM, BET and LPSA. Due to the doped FA, the microstructure of CaO became fluffy and open, which improved the specific surface area and pore size of CaO. It indicated that the addition of FA was beneficial to the diffusion and absorption of CO<sub>2</sub> and delayed the appearance of sintering, which significantly enhanced the CO<sub>2</sub> capture performance of CaO. Using FA to modify CaO to capture CO<sub>2</sub> provides an idea for efficient carbon capture, and has practical application potential. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.</p>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":"13 3","pages":"421-431"},"PeriodicalIF":2.7000,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Greenhouse Gases: Science and Technology","FirstCategoryId":"93","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ghg.2213","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
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Abstract
Capturing CO2 from fossil fuel combustion is of importance for mitigation of climate warming. Among the CO2 capture technologies, the calcium-based sorbent method is promising. However, the most prominent problem of this method at present is that the activity of the sorbent decreases as the number of cycle reactions increases. It seriously affects the industrial application of the calcium-based sorbent method in carbon capture technology. Fulvic acid (FA) is a biologically active and soluble component of humic acid. Compared with other humic acids, it contains more oxygen and heterocyclic rings. Also, the rings are connected by bridge bonds. Therefore, the ability of FA to chelate cations and its adsorption capacity is stronger than the other humic acids. Therefore, in this work, we first proposed using FA to modify CaO to improve CO2 capture from flue gas. The effects of calcination temperature, carbonation temperature, reaction time and the amount of doped FA on the carbonation conversion rate (CCR) of CaO modified with FA (FA/CaO) were studied in the calcining/carbonizing room at atmospheric pressure. The experiment showed that the first CCR (X 1 ) of FA/CaO reached 0.872 under the optimal conditions, which was 31% higher than X 1 of original CaO. The 20th CCR (X 20 ) was still as high as 0.47, which was three times than X 20 of original CaO. In addition, the sorbent was analyzed and characterized by XRD, SEM, BET and LPSA. Due to the doped FA, the microstructure of CaO became fluffy and open, which improved the specific surface area and pore size of CaO. It indicated that the addition of FA was beneficial to the diffusion and absorption of CO2 and delayed the appearance of sintering, which significantly enhanced the CO2 capture performance of CaO. Using FA to modify CaO to capture CO2 provides an idea for efficient carbon capture, and has practical application potential. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
富里酸改性CaO吸附剂在钙循环中对CO2的捕集性能
从化石燃料燃烧中捕获二氧化碳对减缓气候变暖具有重要意义。在二氧化碳捕集技术中，钙基吸附剂法是一种很有前途的捕集技术。但目前该方法最突出的问题是吸附剂的活性随着循环反应次数的增加而降低。严重影响了钙基吸附剂法在碳捕集技术中的工业应用。黄腐酸(FA)是一种具有生物活性和可溶性的腐植酸成分。与其他腐植酸相比，它含有更多的氧和杂环。此外，这些环是通过桥键连接的。因此，FA对阳离子的螯合能力和吸附能力强于其他腐植酸。因此，在这项工作中，我们首次提出使用FA改性CaO来提高烟气中CO2的捕集。在常压煅烧/碳化室内，研究了煅烧温度、碳化温度、反应时间和掺FA量对FA改性CaO (FA/CaO)的碳化转化率(CCR)的影响。实验表明，在最优条件下，FA/CaO的第一次CCR (X1)达到0.872，比原CaO的X1提高了31%。20期CCR (X20)仍高达0.47，是原CaO X20的3倍。并用XRD、SEM、BET、LPSA等方法对该吸附剂进行了表征。由于FA的掺杂，CaO的微观结构变得蓬松和开放，提高了CaO的比表面积和孔径。结果表明，FA的加入有利于CO2的扩散和吸收，延缓了烧结的出现，显著提高了CaO的CO2捕集性能。利用FA改性CaO捕集CO2为高效碳捕集提供了思路，具有实际应用潜力。©2023化学工业协会和John Wiley &儿子,有限公司
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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