A numerical modelling study of SO2 adsorption on activated carbons with new rate equations

Ziyi Li, Yingshu Liu, Haihong Wang, Chuen-Jinn Tsai, Xiong Yang*, Yi Xing, Chuanzhao Zhang, Penny Xiao, Paul A. Webley

*此作品的通信作者

研究成果: Article同行評審

38 引文 斯高帕斯(Scopus)

摘要

Modelling dynamic adsorption of sulfur dioxide (SO 2 ) on activated carbons (ACs) is significant in guiding practical desulphurization processes and making highly efficient use of adsorbents in terms of the adsorption rate which largely depends on particle size. In this work, models derived from the Vermeulen and an improved linear driving force (LDF) rate equation were studied for the first time on SO 2 adsorption over AC particles with different sizes. For larger particles (≥3 mm), breakthrough curves predicted by the Vermeulen equation showed good agreement with experimental data, demonstrating that intraparticle diffusion resistance varied with particle size, feed concentration, adsorption time and location. For smaller particles (1 mm), a correction on the volume-averaged adsorption capacity as a function of adsorption time and saturation in the rate equation was developed to avoid the underestimation of adsorption rate due to the inappropriate parabolic concentration profile inherent in the conventional LDF model. By providing a concentration gradient and adsorption rate closer to actual values, the improved LDF equation was confirmed to provide excellent prediction results on 1-mm particles. Different modelling characteristics of the two models indicates varying effects of intraparticle diffusion on adsorption rate with particle size regarding the specificity of SO 2 physisorption on ACs.

原文English
頁(從 - 到)858-866
頁數9
期刊Chemical Engineering Journal
353
DOIs
出版狀態Published - 1 12月 2018

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