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Cross-interaction of volatiles from co-pyrolysis of lignin with pig manure and their effects on properties of the resulting biochar

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Abstract

Biomass and pig manure have distinct compositions and the co-pyrolysis of them has gained much attention. However, the influence of volatiles interaction on the properties of the char was still unclear. In this study, lignin was selected as the model component of biomass with pig manure for co-pyrolysis at 600 °C. The results indicate that volatiles from co-pyrolysis promoted re-condensation reaction, resulting in the higher char yield (48.0% in co-pyrolysis versus 31.0% in pyrolysis of single manure) and the formation of more aromatics in bio-oil. The co-pyrolysis also facilitated the dehydrogenation and dehydration reactions, which accounted for the elimination of oxygen and nitrogen contents and thus a higher carbon content (64.7% in the co-pyrolysis versus the averaged value of 46.4% from the pyrolysis of single feedstock), higher crystallinity and thermal stability of the char. The in-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) characterization results demonstrated that the functionalities abundances of char with temperature was influenced by volatiles interaction via accelerating the carbonization reaction. In addition, the high heating value (HHV) of char was obviously improved by cross-interaction of volatiles during co-pyrolysis (24.4 MJ/Kg in co-pyrolysis versus averaged value of 15.1 MJ/Kg from single pyrolysis), implying that the co-pyrolysis enhanced the energy density of the resulting char.

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Abbreviations

C-M solution:

Methanol and chloroform mixed solution with 4:1 of volume

HHV:

High heating value

GCMS:

Gas chromatography mass spectrometry

ED:

Energy densification

UV:

UV-fluorescence spectroscopy

EY:

Energy yield

XRD:

X-ray diffraction

EA:

Elemental analysis

TG:

Thermogravimetry

FT-IR:

Fourier transform infrared spectroscopy

In-situ DRIFTS:

In situ-diffuse reflectance infrared Fourier transform spectroscopy

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Acknowledgements

This work was supported by National Natural Science Foundation of China (No. 51876080), the Program for Taishan Scholars of Shandong Province Government, the Agricultural Innovation Program of Shandong Province (SD2019NJ015) and the R & D program of Shandong Basan Graphite New Material Plant.

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Correspondence to Xun Hu.

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: None.

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Li, C., Sun, Y., Zhang, L. et al. Cross-interaction of volatiles from co-pyrolysis of lignin with pig manure and their effects on properties of the resulting biochar. Biochar 3, 391–405 (2021). https://doi.org/10.1007/s42773-021-00086-2

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  • DOI: https://doi.org/10.1007/s42773-021-00086-2

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