EFFECT OF ACID-BASE CATALYSIS ON HYDROTHERMAL CARBON COMPOSITION AND STRUCTURE OF FRUITWOOD BRANCHES

Liu Yaoxin; Wang Yuan; Pan Yihui; Bo Ling; Wen Bo

doi:10.19912/j.0254-0096.tynxb.2023-1586

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 18-24. DOI: 10.19912/j.0254-0096.tynxb.2023-1586

EFFECT OF ACID-BASE CATALYSIS ON HYDROTHERMAL CARBON COMPOSITION AND STRUCTURE OF FRUITWOOD BRANCHES

Liu Yaoxin¹, Wang Yuan², Pan Yihui², Bo Ling³, Wen Bo¹

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Abstract

Hydrothermal carbon was prepared by hydrothermal carbonization using fruitwood branches as raw material and citric acid and KOH as catalysts to investigate the effect of acid and alkali catalysis on the composition and structure of fruitwood branches hydrothermal carbon. The results show that hydrothermal carbonization can improve the fuel quality of biomass, the addition of citric acid can increase the degree of carbonization and the calorific value of the hydrothermal carbon from 18.06 MJ/kg to 22.23 MJ/kg, while the addition of KOH increases the ash content and decreases the calorific value of the hydrothermal carbon; the hydrothermal carbon has a predominantly mesoporous structure and many char particles are formed on the surface. The addition of citric acid promotes the formation of carbon particles, while KOH has the opposite effect; the increase in reaction temperature and the addition of catalyst increases the specific surface area of the hydrothermal carbon from 3.63 m²/g to a range of 496.37-582.40 m²/g;the formation of micropore is promoted by low concentrations of citric acid and KOH; and the arylation of hydrothermal carbon can be promoted by both high temperature and high concentration of citric acid and KOH; the addition of citric acid is able to increase the degree of graphitization of the hydrothermal charcoal, and the addition of KOH deepens the degree of am

Key words

biomass / hydrothermal carbonization / hydrothermal carbon / catalyst / specific surface area

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Liu Yaoxin, Wang Yuan, Pan Yihui, Bo Ling, Wen Bo. EFFECT OF ACID-BASE CATALYSIS ON HYDROTHERMAL CARBON COMPOSITION AND STRUCTURE OF FRUITWOOD BRANCHES[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 18-24 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1586

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