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Effect of Potassium Salts on Biochar Pyrolysis

Author

Listed:
  • Yuthapong Wongmat

    (Department of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA)

  • David R. Wagner

    (Department of Chemical and Materials Engineering, San Jose State University, One Washington Square, San Jose, CA 95192, USA)

Abstract

Alkali pretreatment is one of the chemical pretreatment technologies that has been examined on various types of lignocellulosic biomass. To gain a better insight into the effects of a potassium-based catalyst on pyrolysis behavior with different materials, potassium bicarbonate (KHCO 3 ) and potassium nitrate (KNO 3 ) were used as additives in this study. The experimental parameters which included particle size, heating rate, and additive loading were investigated. The results showed that adding potassium for both KHCO 3 and KNO 3 to feedstocks led to increase in biochar. A model-free method, Flynn–Wall–Ozawa (FWO), was implemented in this study to determine the activation energy values for untreated and potassium-treated feedstocks. A reduction in apparent activation energy values of treated biomass was observed. This indicates that adding potassium salt to biomass influenced the structures of the main components and promoted the catalytic effect of pyrolysis. Activation energies of treated pine range from 250 to 308 kJ/mol, and energies of wheat straw range from 277 to 402 kJ/mol.

Suggested Citation

  • Yuthapong Wongmat & David R. Wagner, 2022. "Effect of Potassium Salts on Biochar Pyrolysis," Energies, MDPI, vol. 15(16), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5779-:d:883934
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    References listed on IDEAS

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    1. Safar, Michal & Lin, Bo-Jhih & Chen, Wei-Hsin & Langauer, David & Chang, Jo-Shu & Raclavska, H. & Pétrissans, Anélie & Rousset, Patrick & Pétrissans, Mathieu, 2019. "Catalytic effects of potassium on biomass pyrolysis, combustion and torrefaction," Applied Energy, Elsevier, vol. 235(C), pages 346-355.
    2. Dupont, Capucine & Jacob, Sylvain & Marrakchy, Khalil Ould & Hognon, Céline & Grateau, Maguelone & Labalette, Françoise & Da Silva Perez, Denilson, 2016. "How inorganic elements of biomass influence char steam gasification kinetics," Energy, Elsevier, vol. 109(C), pages 430-435.
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