INVESTIGATION ON STRUCTURE EVOLUTION OF BIOCHAR AND SYNERGISTIC EFFECT DURING CO-PYROLYSIS PROCESS OF LIGNOCELLULOSIC BIOMASS AND MICROALGAE

Wang Yan; Zhu Xianqing; Huang Yun; Xu Mian; Zhu Xun; Liao Qiang

doi:10.19912/j.0254-0096.tynxb.2024-1109

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 1-12. DOI: 10.19912/j.0254-0096.tynxb.2024-1109

INVESTIGATION ON STRUCTURE EVOLUTION OF BIOCHAR AND SYNERGISTIC EFFECT DURING CO-PYROLYSIS PROCESS OF LIGNOCELLULOSIC BIOMASS AND MICROALGAE

Wang Yan^1,2, Zhu Xianqing^1,2, Huang Yun^1,2, Xu Mian^1,2, Zhu Xun^1,2, Liao Qiang^1,2

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Abstract

In this study, the effects of pyrolysis temperature and lignocellulosic biomass/microalgae blending ratios on the yield, elemental composition, surface morphology, thermal stability, pore structure, surface functional group distribution and carbon skeleton structure of biochar derived from lignocellulosic biomass and microalgae co-pyrolysis were systematically investigated, and the synergistic effect and reaction mechanism during the co-pyrolysis process were further revealed. The results show that pyrolysis temperature and biomass/microalgae blending ratios had significant influence on the yield and physicochemical structure of co-pyrolysis biochar. The biochar yield decreases with rising pyrolysis temperature, and increases with higher microalgae blending ratios. The yield of co-pyrolysis biochar can reach as high as 41.51%, which is 23.5% higher than that of individual biomass biochar. The co-pyrolysis process of microalgae and lignocellulosic biomass exhibits a significant synergistic effect, which can enhance the yield of biochar and significantly promote the enrichment of C and N elements in biochar. The increase of pyrolysis temperature facilitates the conversion of pyridine-N to quaternary-N in biochar. With the increase of the microalgae blending ratios, the disorder degree and aromaticity of biochar is enhanced. The nitrogen-containing volatile produced from microalgae can react with the oxygen-containing functional groups on biomass through Maillard reaction, which further experience cyclization reactions and polycondensation reactions to form nitrogen-rich biochar.

Key words

lignocellulose / microalgae / pyrolysis / biochar / synergistic effect / structural evolution

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Wang Yan, Zhu Xianqing, Huang Yun, Xu Mian, Zhu Xun, Liao Qiang. INVESTIGATION ON STRUCTURE EVOLUTION OF BIOCHAR AND SYNERGISTIC EFFECT DURING CO-PYROLYSIS PROCESS OF LIGNOCELLULOSIC BIOMASS AND MICROALGAE[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 1-12 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1109

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