Chlorine Gas Removal by H 2 Treated Red Mud for the Potential Application in Waste Plastic Pyrolysis Process

Tae-Young Kim, Seo-Hye Hong, Jae-Chang Kim, Hye-Won Jang, Yeji Lee, Hyun-Ji Kim, Soo-Chool Lee () and Suk-Hwan Kang ()
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Tae-Young Kim: Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Republic of Korea
Seo-Hye Hong: Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Jae-Chang Kim: Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Hye-Won Jang: Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Yeji Lee: Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Republic of Korea
Hyun-Ji Kim: Institute for Advanced Engineering, Yongin 41718, Republic of Korea
Soo-Chool Lee: Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Republic of Korea
Suk-Hwan Kang: Institute for Advanced Engineering, Yongin 41718, Republic of Korea

Sustainability, 2024, vol. 16, issue 3, 1-11

Abstract: In the process of pyrolyzing waste plastics, the generation of Cl 2 gas can pose a problem. During the pyrolysis processing, incomplete combustion of organic compounds containing chlorine can lead to the formation of toxic chemicals, which can cause issues in subsequent processing stages. Therefore, an adsorbent plays an important role in removing Cl 2 in the dechlorination process, and alkaline adsorbents and metal oxides are generally used. Waste red mud is composed of Fe metal oxide and alkaline components, so it is intended to be used as a Cl 2 adsorbent. The Cl 2 removal ability of red mud with different redox status of iron oxides was assessed. Hydrogen treatment was performed at various temperatures to control the reduction potential of the Fe in the metal oxides, and phase changes in the Fe oxide component of red mud were confirmed. In the case of red mud hydrogenated at 700 °C, most of the Fe 2 O 3 structure could be converted to the Fe 3 O 4 structure, and the Fe 3 O 4 structure showed superior results in Cl 2 adsorption compared to the Fe 2 O 3 structure. As a result, red mud at an H 2 treatment temperature of 700 °C showed about three times higher Cl 2 adsorption compared to red mud without H 2 treatment.

Keywords: red mud; H 2 -treatment; dechlorination; waste plastic; pyrolysis (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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