Abstract
In the present study, the effect of hydrochloric acid washing on the structure characteristic and pyrolysis behavior of tobacco stalk were investigated. Proximate analysis and elemental compositions of the samples showed that the volatiles and ash contents decreased while fixed carbon increased after the acid washing pretreatment. Meanwhile, the inorganic species can be greatly removed and HHV of acid-washed tobacco stalk was increased by 20.52% to 17.15 MJ/kg. FTIR and XRD analysis showed that acid washing also changed the surface chemical and cellulose crystalline structure of tobacco stalk. Furthermore, pyrolysis characteristic parameters obtained from thermogravimetry analysis indicated that acid washing increased the initial and final pyrolysis temperature, as well as the comprehensive pyrolysis index of biomass because of the removal of unstable volatile components and the change of microstructure. Pyrolysis kinetic behavior was studied through Coats–Redfern and Kissinger–Akahira–Sunose methods, and the decreased ∆H and negative ∆S for W-TS during the pyrolysis process may indicate an enhanced reaction reactivity after the acid washing.
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This work was supported by the Research Foundation (No. 2019ZCKJ304, 2014BSJJ067) of Zhengzhou University of Light Industry.
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Liang, M., Yang, T., Zhang, G. et al. Effects of hydrochloric acid washing on the structure and pyrolysis characteristics of tobacco stalk. Biomass Conv. Bioref. 13, 6817–6830 (2023). https://doi.org/10.1007/s13399-021-01616-5
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DOI: https://doi.org/10.1007/s13399-021-01616-5