Oxidation kinetics of biochar from woody and herbaceous biomass

Peterson, Chad A.; Brown, Robert C.

doi:10.1016/j.cej.2020.126043

Title: Oxidation kinetics of biochar from woody and herbaceous biomass

Journal Article · Sat Jun 27 00:00:00 EDT 2020 · Chemical Engineering Journal

DOI:https://doi.org/10.1016/j.cej.2020.126043· OSTI ID:1648151

Peterson, Chad A. ^[1]; Brown, Robert C. ^[1]

Iowa State Univ., Ames, IA (United States)

The goal of this study was to determine oxidation kinetics for biochar produced from fast pyrolysis of various biomass feedstocks. In particular, the role of inherent ash content on the oxidation rate was evaluated. Thermogravimetric analysis (TGA) and fluidized bed combustion experiments were used to explore oxidation kinetics of six fast pyrolysis produced biochars with diverse ash content. Here, the reaction rates varied by a factor of three under chemical kinetic-limited conditions, demonstrating inorganic content impacts oxidation rate. Chemical kinetic rate coefficients were proposed as a function of compositional parameters to determine overall fit and impact. Potassium content was found to have a positive correlation, best describing the differences in the oxidation kinetic rate coefficients. Additionally, feedstocks were subjected to a 1 M HCl acid wash mitigating the catalytic activity of the metals. Acid washed biochars had lower oxidation kinetic rates compared to their unwashed counterparts, indicating the removal of catalytically active metals reduced oxidation rate. Gas composition (CO/CO₂) was measured during fluidized bed experiments for both acid-washed and unwashed biochars, which varied between the six biochars. Formation of CO₂ was greatly affected by catalytic metals, finding potassium content to correlate well with a higher percentage of CO₂ formation as compared to CO. Comparison of oxidation rates were made between the two experimental apparatuses to measure the effect of attrition on biochar oxidation.

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Research Organization:: Iowa State Univ., Ames, IA (United States); RAPID Manufacturing Inst., New York, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: EE0008326; EE0007888

OSTI ID:: 1648151

Alternate ID(s):: OSTI ID: 1635586; OSTI ID: 1718907; OSTI ID: 1855387

Journal Information:: Chemical Engineering Journal, Vol. 401; ISSN 1385-8947

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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