aliphatic structure, char surface area, coal pyrolysis, modeling


The influence of changes in aliphatic structure on char surface area during coal pyrolysis was modeled, and the effect was introduced to a previous char surface area model for lignite pyrolysis established based on the chemical percolation devolatilization (CPD) model. The modified model can predict not only the N2 and CO2 char surface area during rapid pyrolysis of three lignites but also the CO2 char surface area of two high-volatile bituminous coals; the agreement of the modified model with experiments is improved at high temperatures. The decrease in aliphatic chain length can reduce adsorption positions around aromatic core, and decrease char surface area. When mass release is more than 55% at about 1,100 K, the predicted N2 char surface area starts to decrease with further generation of volatiles, and the increase of predicted CO2 char surface area with increasing generation of volatiles also become slow at the end of mass release.

Original Publication Citation

Yang, H., T. H. Fletcher, Y. Li, L. Jin, S. Li, Y. Shang, and H. Hu, “Modeling the Influence of Changes in Aliphatic Structure on Char Surface Area during Coal Pyrolysis,” AIChE Journal, 66, e16834 (2020). DOI: 10.1002/aic.16834

Document Type

Peer-Reviewed Article

Publication Date







Ira A. Fulton College of Engineering


Chemical Engineering

University Standing at Time of Publication

Full Professor