Abstract The adsorption behavior of basic compounds in practical vacuum gas oil is quantitatively analyzed on amorphous silica-alumina with acid sites, mesopores and thermal stability. Time course of adsorption capacity was found to be controlled by kinetics but not by equilibrium. The rate of adsorption was found to have pseudo second-order but not pseudo first-order kinetics, indicating that the adsorption rate was mainly controlled by the diffusion of large molecules. The particle size did not influence the adsorption quantity at equilibrium, whereas the smaller particle size increased the adsorption rate. The adsorption quantity at equilibrium was influenced by the molecular structure of basic compound due to steric hinderance around the basic site, whereas the adsorption rate strongly depended on the molecular size, supporting that the adsorption rate was mainly controlled by the diffusion of compounds in the pores of amorphous silica-alumina. Comparison of solvents showed that the adsorption quantity at equilibrium was influenced by the polarity but not by the molecular size, while the adsorption rate strongly depended on both the polarity and molecular size. The reusability of adsorbent silica-alumina was demonstrated by the stable adsorption capacity and rate after calcination for the regeneration.

中文翻译：

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无定形二氧化硅-氧化铝从实用重油中去除碱性含氮化合物的吸附动力学

摘要 定量分析了实际减压瓦斯油中碱性化合物在具有酸性位、介孔和热稳定性的无定形二氧化硅-氧化铝上的吸附行为。发现吸附容量的时间过程受动力学控制，但不受平衡控制。发现吸附速率具有拟二级动力学而非拟一级动力学，表明吸附速率主要受大分子扩散控制。粒径不影响平衡时的吸附量，而较小的粒径增加了吸附速率。由于碱性位点周围的空间位阻，平衡吸附量受碱性化合物分子结构的影响，而吸附速率强烈依赖于分子大小，支持吸附速率主要受化合物在无定形二氧化硅 - 氧化铝孔中的扩散控制。溶剂比较表明，平衡时的吸附量受极性影响，而不受分子大小的影响，而吸附速率强烈依赖于极性和分子大小。吸附剂二氧化硅-氧化铝的可重复使用性通过煅烧再生后稳定的吸附容量和吸附速率来证明。