Modelling dynamic adsorption of sulfur dioxide (SO₂) 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 SO₂ 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 SO₂ physisorption on ACs.

对二氧化硫（SO ₂）在活性炭（AC）上的动态吸附进行建模对于指导实际的脱硫过程以及就很大程度上取决于粒度的吸附速率而言，高效利用吸附剂具有重要意义。在这项工作中，首次在SO ₂上研究了源自Vermeulen的模型和改进的线性驱动力（LDF）速率方程。吸附在不同尺寸的AC颗粒上。对于较大的颗粒（≥3mm），Vermeulen方程预测的穿透曲线与实验数据吻合良好，表明颗粒内扩散阻力随粒径，进料浓度，吸附时间和位置而变化。对于较小的颗粒（1毫米），开发了根据吸附速率和饱和度在速率方程中对体积平均吸附容量进行校正的方法，以避免由于常规LDF固有的不适当的抛物线浓度曲线而低估吸附速率模型。通过提供接近实际值的浓度梯度和吸附速率，可以确认改进的LDF方程可为1-mm颗粒提供出色的预测结果。₂在AC上的物理吸附。