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Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species

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  • Dongdong Feng

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yijun Zhao

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yu Zhang

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Shaozeng Sun

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Jianmin Gao

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

Abstract

The effect of chemical speciation (H 2 O/NH 4 Ac/HCl-soluble and insoluble) of alkali and alkaline earth metallic species on the steam gasification of sawdust biochar was investigated in a lab-scale, fixed-bed reactor, with the method of chemical fractionation analysis. The changes in biochar structures and the evolution of biochar reactivity are discussed, with a focus on the contributions of the chemical speciation of alkali and alkaline earth metallic species (AAEMs) on the steam gasification of biochar. The results indicate that H 2 O/NH 4 Ac/HCl-soluble AAEMs have a significant effect on biochar gasification rates. The release of K occurs mainly in the form of inorganic salts and hydrated ions, while that of Ca occurs mainly as organic ones. The sp 3 -rich or sp 2 -sp 3 structures and different chemical-speciation AAEMs function together as the preferred active sites during steam gasification. H 2 O/HCl-soluble AAEMs could promote the transformation of biochar surface functional groups, from ether/alkene C-O-C to carboxylate COO − in biochar, while they may both be improved by NH 4 Ac-soluble AAEMs. H 2 O-soluble AAEMs play a crucial catalytic role in biochar reactivity. The effect of NH 4 Ac-soluble AAEMs is mainly concentrated in the high-conversion stage (biochar conversion >30%), while that of HCl-soluble AAEMs is reflected in the whole activity-testing stage.

Suggested Citation

  • Dongdong Feng & Yijun Zhao & Yu Zhang & Shaozeng Sun & Jianmin Gao, 2018. "Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species," Energies, MDPI, vol. 11(1), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:1:p:205-:d:127020
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    References listed on IDEAS

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    1. Damartzis, T. & Zabaniotou, A., 2011. "Thermochemical conversion of biomass to second generation biofuels through integrated process design--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(1), pages 366-378, January.
    2. Parthasarathy, Prakash & Narayanan, K. Sheeba, 2014. "Hydrogen production from steam gasification of biomass: Influence of process parameters on hydrogen yield – A review," Renewable Energy, Elsevier, vol. 66(C), pages 570-579.
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    Cited by:

    1. Shengguo Zhao & Liang Ding & Yun Ruan & Bin Bai & Zegang Qiu & Zhiqin Li, 2021. "Experimental and Kinetic Studies on Steam Gasification of a Biomass Char," Energies, MDPI, vol. 14(21), pages 1-23, November.
    2. Mejdi Jeguirim & Lionel Limousy, 2019. "Biomass Chars: Elaboration, Characterization and Applications II," Energies, MDPI, vol. 12(3), pages 1-6, January.
    3. Dahou, T. & Defoort, F. & Khiari, B. & Labaki, M. & Dupont, C. & Jeguirim, M., 2021. "Role of inorganics on the biomass char gasification reactivity: A review involving reaction mechanisms and kinetics models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    4. Qiaoqun Sun & Zhiqi Zhao & Shizhang Wang & Yu Zhang & Yaodong Da & Heming Dong & Jiwang Wen & Qian Du & Jianmin Gao, 2022. "Effects of Temperature and Chemical Speciation of Mineral Elements on PM10 Formation during Zhundong Coal Combustion," Energies, MDPI, vol. 16(1), pages 1-10, December.
    5. Nadia Cerone & Francesco Zimbardi, 2018. "Gasification of Agroresidues for Syngas Production," Energies, MDPI, vol. 11(5), pages 1-18, May.
    6. Liu, Shasha & Wu, Gang & Gao, Yi & Li, Bin & Feng, Yu & Zhou, Jianbin & Hu, Xun & Huang, Yong & Zhang, Shu & Zhang, Hong, 2021. "Understanding the catalytic upgrading of bio-oil from pine pyrolysis over CO2-activated biochar," Renewable Energy, Elsevier, vol. 174(C), pages 538-546.

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