Adsorption of Naphthalene on Activated Wood Charcoal Derived from Biomass Gasification

During gasification and/or pyrolysis of wooden biomass, charcoal is formed as a solid intermediate or product. In CO2‐ and H2O‐rich atmospheres at high temperatures, a high specific surface area of several 100 m2 per gram of charcoal may be reached. Common biomass gasifiers aim at a charcoal convers...

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Bibliographic Details
Published in:Chemical engineering & technology 2021-06, Vol.44 (6), p.972-979
Main Authors: Gradel, Andy, Wünning, Joachim Alfred, Plessing, Tobias, Jess, Andreas
Format: Article
Language:English
Subjects:
Activated carbon
Activated wood charcoal
Adsorption
Biomass
Biomass gasification
Breakthrough modeling
Charcoal
Gasification
Naphthalene
Pyrolysis
Synthesis gas
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Summary:During gasification and/or pyrolysis of wooden biomass, charcoal is formed as a solid intermediate or product. In CO2‐ and H2O‐rich atmospheres at high temperatures, a high specific surface area of several 100 m2 per gram of charcoal may be reached. Common biomass gasifiers aim at a charcoal conversion of 100 %. Up to now, the option of a subsequent usage of the charcoal for adsorption of tar compounds has rarely been considered but is an interesting option to produce a clean syngas in a downstream adsorption unit. Experimental studies show an adsorption capacity of up to 0.4 g of tar per gram of charcoal using naphthalene as a model substance for tar. Respective adsorption isotherms, breakthrough curves in a fixed‐bed adsorber, and a kinetic breakthrough model are presented. Thermal gasification of biomass is an attractive technology for sustainable conversion to syngas. For a new approach to biomass gasification, experimental and model studies on the adsorption properties of naphthalene on wood charcoal from gasification processes are performed. Adsorption isotherms, breakthrough curves, and a numerical model are presented to improve reactor design and gas cleanup performance.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201900632