A Study on the Mechanisms of Coal Fly Ash to Improve the CO 2 Capture Efficiency of Calcium-Based Adsorbents

Ziyu Zhao, Kefan Zhang, Jianfeng Luo, Meixuan Wu, Xiyue Wang, Keke Wang () and Shengyu Liu ()
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Ziyu Zhao: College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China
Kefan Zhang: College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China
Jianfeng Luo: Guiyang Rail Transit Line 3 Construction and Operation Co., Ltd., Guiyang 550081, China
Meixuan Wu: School of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610225, China
Xiyue Wang: College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China
Keke Wang: Sichuan Academy of Eco-Environmental Sciences, Chengdu 610041, China
Shengyu Liu: College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China

Sustainability, 2024, vol. 16, issue 18, 1-11

Abstract: Utilizing calcium-based adsorbents for CO 2 adsorption through cyclic calcination/carbonization is one of the most cost-effective methods for carbon emission reduction. In order to improve the cycle stability of the adsorbents and the capture efficiency of CO 2 , this study used industrial solid waste coal fly ash for the hydration treatment of calcium-based adsorbent to explore the variations in the cyclic adsorption performance of the adsorbent under different doping ratios and hydration conditions. By means of various characterization techniques, the microscopic mechanism for improving the performance of the modified adsorbent was analyzed from the perspectives of chemical composition, physical structure, and surface functional groups of the adsorbents. The results demonstrated that the modification of coal fly ash could significantly enhance the carbonation performance and cycle stability of the adsorbent in multiple CO 2 capture processes. The modified material doped with 5% coal fly ash had the highest total CO 2 adsorption capacity, which increased by 13.7% compared to before modification. Additionally, the modified material doped with 10% coal fly ash exhibited the strongest cyclic adsorption capacity, which was 14.0% higher than that before modification, and the adsorption attenuation rate decreased by 32.2%. The characterization results showed that the reaction between calcium oxide and coal fly ash formed CaSiO 3 and Ca 12 Al 14 O 33 during the modification process, which was the primary reason for the improvement in the CO 2 capture performance of the modified materials. This study provided a new perspective on the resource utilization of solid waste fly ash and efficient CO 2 capture.

Keywords: adsorbent; coal fly ash; resource utilization; carbon dioxide; carbon emission reduction (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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