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Effects of Chain Alkanes on Restraining Water Re-Adsorption of Dried Indonesian Lignite

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Abstract

An Indonesian lignite (IN) was hydrothermally treated at 150–250°C for 20 min and the treated samples were mixed with different amounts of different chain alkanes. The water re-adsorption tests were measured using a desiccator method. To reveal the mechanism of chain alkanes restraining water re-adsorption of lignite, the changes in some physicochemical properties were characterized by Fourier transform infrared spectrometry, N2 adsorption-desorption, and thermogravimetric (TG) analysis. The results showed that the water re-adsorption contents of all samples decreased with increasing content of chain alkanes; this is because the addition of chain alkanes could cover some oxygen-containing functional groups on the surface of lignite and block partial pores in lignite, which became much obvious with increasing amount of chain alkanes. Moreover, the water re-adsorption content first increased and then decreased as the chain length of alkanes increased, and octane showed the optimum effect on restraining water re-adsorption.

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Funding

This work was supported by the National Natural Science Foundation of China (grant no. 22278001), the Natural Science Foundation of Anhui Provincial Education Department (no. KJ2021A0407), Anhui Provincial Postdoctoral Science Foundation (no. 2021B538), and Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology (no. CHV21-03).

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Authors and Affiliations

  1. Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, 243002, Ma’anshan, Anhui, China

    Huan Song, Kangshun Han, Yuan Fang, Guoqing Li, **angchun Liu & ** Cui

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  1. Huan Song
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  2. Kangshun Han
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  3. Yuan Fang
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Correspondence to **angchun Liu or ** Cui.

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Huan Song, Han, K., Fang, Y. et al. Effects of Chain Alkanes on Restraining Water Re-Adsorption of Dried Indonesian Lignite. Coke Chem. 66, 163–170 (2023). https://doi.org/10.3103/S1068364X23700540

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  • DOI: https://doi.org/10.3103/S1068364X23700540

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