Characterization of Humic Acid Salts and Their Use for CO2 Reduction


Spietz T. Kazankapova M. Dobras S. Kassenova Z. Yermagambet B. Khalimon A.Y. Stelmach S.
September 2024Multidisciplinary Digital Publishing Institute (MDPI)

Minerals
2024#14Issue 9

The European Union aims to be climate neutral by 2050. To achieve this ambitious goal, net greenhouse gas emissions must be reduced by at least 55% by 2030. Post-combustion CO2 capture methods are essential to reduce CO2 emissions from the chemical industry, power generation, and cement plants. To reduce CO2, it must be captured and then stored underground or converted into other valuable products. Apromising alternative for CO2 reduction is the use of humic acid salts (HASs). This work describes a process for the preparation of potassium (HmK) and ammonium (HmA) humic acid salts from oxidized lignite (leonardite). A detailed characterization of the obtained HASs was conducted, including elemental, granulometric, and thermogravimetric analyses, as well as 1H-NMR and IR spectroscopy. Moreover, the CO2 absorption capacity and absorption rate of HASs were experimentally investigated. The results showed that the absorption capacity of the HASs was up to 10.9 g CO2 per kg. The CO2 absorption rate of 30% HmA solution was found to be similar to that of 30% MEA. Additionally, HmA solution demonstrated better efficiency in CO2 absorption than HmK. One of the issues observed during the CO2 absorption was foaming of the solutions, which was more noticeable with HmK.

absorption , ammonium humate , CO2 capture , CO2 reduction , humic acid , leonardite , oxidized lignite , potassium humate

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Institute of Technology and Fuel Processing Technology (ITPE), Zamkowa 1, Zabrze, 41-803, Poland
Limited Liability Partnership, Institute of Coal Chemistry and Technology, Akzhol Avenue 47, Astana, 010000, Kazakhstan
Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Kabanbay Batyr Avenue 53, Astana, 010000, Kazakhstan

Institute of Technology and Fuel Processing Technology (ITPE)
Limited Liability Partnership
Department of Chemistry

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