Diffusivities of Hydrocarbons in the Fresh and Aged Hydrotreating Catalysts Studied by Zero-Length Column Method,Industrial & Engineering Chemistry Research

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Diffusivities of Hydrocarbons in the Fresh and Aged Hydrotreating Catalysts Studied by Zero-Length Column Method
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-05-19 , DOI: 10.1021/acs.iecr.2c00291
Zhentao Chen ₁ , Linxie Hu ₂ , Jiahuan Yu ₁ , Tao Jiang ₁ , Chunming Xu ₁

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Diffusivities of a series of hydrocarbons with different configurations in two zeolites (ZSM-5 and SBA-15) and a hydrotreating catalyst (NiMo/Al₂O₃) were determined by the zero-length column technique. The results revealed that the molecular configuration of hydrocarbons has a significant effect on the diffusion property in zeolites. In addition, the aromatics show surface diffusion effect in the mesoporous SBA-15 and NiMo/Al₂O₃. The diffusion characteristic of 1,3,5-triisopropylbenzene (TiPB) was applied to evaluate the change of diffusion properties of a mesoporous-scale hydrotreating catalyst with 2000 h of deactivation. Arrhenius plots of the diffusional time constants show two distinct linear fitting regions for both the fresh and aged catalysts. The reduction degree in diffusivity over the aged catalyst shows an increasing tendency at low temperatures but gradually decreases at high temperatures. A correlation between pore size and diffusivities was established to reveal the influence of structure on its diffusion property.

中文翻译：

零柱法研究新旧加氢处理催化剂中烃类的扩散率

通过零长度柱技术测定了一系列具有不同构型的烃在两种沸石（ZSM-5 和 SBA-15）和加氢处理催化剂（NiMo/Al ₂ O _{3 ）中的扩散率。}结果表明，烃的分子构型对沸石中的扩散性能有显着影响。此外，芳烃在介孔SBA-15和NiMo/Al ₂ O _{3中表现出表面扩散效应。}. 应用1,3,5-三异丙基苯（TiPB）的扩散特性来评估介孔规模加氢处理催化剂在失活2000小时后的扩散性能变化。扩散时间常数的 Arrhenius 图显示了新鲜和老化催化剂的两个不同的线性拟合区域。老化催化剂上扩散率的降低程度在低温下呈增加趋势，但在高温下逐渐降低。建立了孔径和扩散率之间的相关性，以揭示结构对其扩散特性的影响。

更新日期：2022-05-19

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