Modification of Waste-derived CaO Using Organic Acids for CO2 Capture
International Journal of Economy, Energy and Environment
Volume 4, Issue 6, December 2019, Pages: 132-135
Received: Nov. 2, 2019; Published: Jan. 6, 2020
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Azra Nawar, US-Pakistan Centre for Advanced Studies in Energy (USPCAS-E), National University of Sciences and Technology (NUST), Islamabad, Pakistan
Majid Ali, US-Pakistan Centre for Advanced Studies in Energy (USPCAS-E), National University of Sciences and Technology (NUST), Islamabad, Pakistan
Rashid Khan, School of Environment, Tsinghua University, Beijing, China
Mariam Mahmood, US-Pakistan Centre for Advanced Studies in Energy (USPCAS-E), National University of Sciences and Technology (NUST), Islamabad, Pakistan
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Calcium looping is a widely used CO2 capture technology, where calcium oxide (CaO) is used as a sorbent. However, it has many drawbacks such as expensive raw material and reduction in sorbent capacity over multiple cycles. This study is aimed at developing economic as well as environment friendly sorbents for CO2 capturing. For this purpose, chicken eggshells were collected from household municipal waste as a CaO sorbent for CO2 capture. The eggshell sorbent was characterized using different techniques such as SEM-EDS, XRD and TGA. Three different organic acids were used to improve the conversion of eggshell sorbents i.e., lactic, oxalic and tartaric acid. The results showed that one out of three acids i.e., lactic acid (ES LA-10%) showed improved conversion and stability over a period of 20 cycles as compared to other acids. In terms of CaO conversion ES LA-10% displayed the maximum performance of 47.8% and had improved cyclic stability during 20 cycles. Hence, this study showed that modifying sorbent (eggshells) by using acid is a better sorbent in comparison with other natural and synthetic sorbent, therefore reducing waste and cost simultaneously.
Eggshell, Organic Acids, CaO Based Sorbent, CO2 Capture
To cite this article
Azra Nawar, Majid Ali, Rashid Khan, Mariam Mahmood, Modification of Waste-derived CaO Using Organic Acids for CO2 Capture, International Journal of Economy, Energy and Environment. Vol. 4, No. 6, 2019, pp. 132-135. doi: 10.11648/j.ijeee.20190406.13
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