Campus Units
Agricultural and Biosystems Engineering, Chemical and Biological Engineering, Mechanical Engineering, Bioeconomy Institute (BEI)
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
12-1-2020
Journal or Book Title
Chemical Engineering Journal
Volume
401
Last Page
126043
DOI
10.1016/j.cej.2020.126043
Abstract
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. 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.
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Copyright Owner
Elsevier B.V.
Copyright Date
2020
Language
en
File Format
application/pdf
Recommended Citation
Peterson, Chad A. and Brown, Robert C., "Oxidation kinetics of biochar from woody and herbaceous biomass" (2020). Mechanical Engineering Publications. 425.
https://lib.dr.iastate.edu/me_pubs/425
Included in
Biochemical and Biomolecular Engineering Commons, Bioresource and Agricultural Engineering Commons, Energy Systems Commons
Comments
This is a manuscript of an article published as Peterson, Chad A., and Robert C. Brown. "Oxidation kinetics of biochar from woody and herbaceous biomass." Chemical Engineering Journal 401 (2020): 126043. DOI: 10.1016/j.cej.2020.126043. Posted with permission.