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Pyrolysis of cellulose with co-feeding of formic or acetic acid

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Abstract

Reaction atmosphere is one of the principle reaction parameters affecting the pyrolysis of biomass. At elevated temperatures, in addition to gases, organics are also regarded as part of the reaction atmosphere. In this study, the impacts of the co-feeding of formic acid or acetic acid on the pyrolysis behaviour of cellulose were investigated at 400 and 600 °C, respectively. The results showed that the co-feeding of the acids significantly affected properties of both the resulting bio-oil and biochar. Co-feeding of acetic acid remarkably promoted formation of heavier organics with π-conjugated structures, while the presence of formic acid suppressed their evolution, especially at the lower pyrolysis temperature of 400 °C. The co-feeding of the carboxylic acids increased the yields of biochar. Furthermore, the co-feeding of formic acid or acetic acid also affected the elemental composition, the defective structure, the crystallinity and the thermal stabilities of the resulting biochar at varied pyrolysis temperature in the distinct ways. The carboxylic acids or their derivatives interfered with the formation of the volatiles or reacted directly with the organic components on surface of biochar, which substantially modified the physiochemical properties of the biochar.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51876080), the Strategic International Scientific and Technological Innovation Cooperation Special Funds of National Key Research and Development Program of China (No. 2016YFE0204000), the Program for Taishan Scholars of Shandong Province Government, the Recruitment Program of Global Experts (Thousand Youth Talents Plan), the Natural Science Foundation of Shandong Province (ZR2017BB002) and the Key Research and Development Program of Shandong Province (2018GSF116014).

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Correspondence to Mortaza Gholizadeh or Xun Hu.

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Zhang, Z., Zhang, C., Zhang, L. et al. Pyrolysis of cellulose with co-feeding of formic or acetic acid. Cellulose 27, 4909–4929 (2020). https://doi.org/10.1007/s10570-020-03118-5

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  • DOI: https://doi.org/10.1007/s10570-020-03118-5

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