The effects of B₂O₃ on the adsorption desulfurization performance of Ag-CeO_x/TiO₂/SiO₂ adsorbent as well as its adsorption-diffusion study were investigated. The results show that the optimum preparation conditions are as follows: co-impregnation, B₂O₃ doping at B to Ti mole ratio of 1:2, supporter calcinating at 550 ℃, active component calcinating at 450 ℃ and volume ratio of ethanol to water at 4:1, which shows good adsorption desulfurization activity due to the high dispersion of Ag and CeO_x species on surface of adsorbent and providing more surface defect sites after B₂O₃ loading. Simultaneously, the Computational Fluid Dynamics (CFD) model was further applied to investigate the adsorption-diffusion behavior inside column to reveal the mechanism of adsorption-diffusion behavior. The results demonstrate that the adsorption desulfurization process can be well described by the porous media CFD model. The entire fixed bed remains adsorbed during the initial adsorption stage. Subsequently, the adsorption efficiency of adsorbent at the fixed bed entrance begins to decrease, and gradually reaches saturation. Finally, the entire fixed bed loses its adsorption capacity. The mass transfer rate is used to further analyze the adsorption-diffusion transfer process in fixed bed, which decreases with the progress of the adsorption process.

研究了B ₂ O ₃对Ag-CeO _x /TiO ₂ /SiO ₂吸附剂吸附脱硫性能的影响及其吸附-扩散研究。结果表明，最佳制备条件为：共浸，B ₂ O ₃掺杂，B与Ti摩尔比为1:2，载体550℃焙烧，活性成分450℃焙烧，乙醇与体积比4:1的水，由于Ag和CeO _x物种在吸附剂表面的高度分散并在B ₂ O ₃之后提供了更多的表面缺陷位点，因此表现出良好的吸附脱硫活性加载。同时，进一步应用计算流体动力学（CFD）模型研究柱内的吸附-扩散行为，揭示吸附-扩散行为的机理。结果表明，多孔介质CFD模型可以很好地描述吸附脱硫过程。在初始吸附阶段，整个固定床保持吸附状态。随后，固定床入口处吸附剂的吸附效率开始下降，并逐渐达到饱和。最后，整个固定床失去吸附能力。传质速率用于进一步分析固定床中的吸附-扩散传递过程，随着吸附过程的进行而降低。