Study of intra-particle diffusion effect on hydrodesulphurization of dibenzothiophenic compounds
Study of intra-particle diffusion effect on hydrodesulphurization of dibenzothiophenic compounds
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DOI：
10.1016/j.cattod.2005.08.006
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发表时间：
2005-11
期刊：
影响因子：
5.3
通讯作者：
Jinwen Chen;H. Yang;Z. Ring
中科院分区：
文献类型：
--
作者：
Jinwen Chen;H. Yang;Z. Ring
本文对轻循环油中二苯并噻吩类化合物加氢脱硫的颗粒内扩散效应进行了实验研究。催化剂有效性因子是在类似的操作条件下使用全尺寸商用 NiMo/Al2O3 加氢处理催化剂及其粉碎的催化剂颗粒测定的。在全尺寸商用催化剂中，存在显着的颗粒内扩散阻力，导致所有研究的二苯并噻吩化合物的脱硫反应速率降低。在具有商业重要性的温度范围内，有效性因子的范围仅为 0.300 至 0.822。在粉碎的催化剂中，颗粒内扩散限制大部分被消除，相应的有效性因子在0.813至0.985之间。空间位阻效应很小或没有的 DBT 具有较高的内在反应性，其有效性因子较低，表明其具有较强的颗粒内扩散阻力。那些具有强空间位阻效应并因此具有低内在反应性的物质具有较高的有效性因子，显示出较弱的颗粒内扩散限制。
In this paper, the intra-particle diffusion effect on hydrodesulphurization of dibenzothiophenic compounds in light cycle oil was experimentally studied. The catalyst effectiveness factors were determined with a full-size commercial NiMo/Al2O3hydrotreating catalyst and its crushed catalyst particles under similar operating conditions. In the full-size commercial catalyst, significant intra-particle diffusion resistance was present, resulting in reduced sulphur removal reaction rates for all the dibenzothiophenic compounds investigated. The effectiveness factors ranged from only 0.300 to 0.822 in the temperature range of commercial importance. In the crushed catalyst, the intra-particle diffusion limitation was mostly eliminated with the corresponding effectiveness factors between 0.813 and 0.985. The DBTs with little or no steric hindrance effect, and thus with high intrinsic reactivities, had lower effectiveness factors, indicating a stronger intra-particle diffusion resistance. Those with strong steric hindrance effect, and thus with low intrinsic reactivities, had higher effectiveness factors, showing a weaker intra-particle diffusion limitation.