Temporally and spatially resolved operando characterization of hydrogenolysis in wax-filled Fischer-Tropsch pellets using magnetic resonance imaging.

使用磁共振成像对蜡填充费托颗粒中的氢解作用进行时间和空间分辨操作表征。

• 批准号: 530078676
• 负责人: Professor Dr.-Ing. Jorg Thöming
• 金额: --
• 依托单位: Fachgebiet Chemische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/530078676?language=en
• 关键词: Temporally; spatially; resolved; operando; characterization

A transient Fischer-Tropsch synthesis (FTS) can lead to an increase in activity and selectivity with respect to desired liquid products when pure or dilute hydrogen is added periodically. This is attributed to a draining of liquid-filled catalyst pores by the hydrogenolysis reaction, in which long carbon chains are broken up with the addition of hydrogen, allowing them to evaporate more easily and escape from the catalyst bed. Overall, the hydrogenolysis reaction of long-chain alkanes in FTS catalyst pores is still little studied. This is not least due to the fact that classical analytical methods such as gas chromatography or mass spectrometry can only quantify the products in the outlet stream of a reactor. Therefore, this project aims to investigate the mass transfer processes of hydrogenolysis using temporally and spatially resolved operando magnetic resonance imaging (MRI). The non-invasive MRI measurements shall allow a characterization of the mass and phase transformations in the reactor and pellet interior during the entire course of pore depletion. In this way, a fundamental understanding of the dynamic process of pore emptying and hydrogenolysis in wax-filled Fischer-Tropsch catalysts will be systematically developed.

当定期添加纯氢或稀氢时，瞬时费托合成 (FTS) 可以提高所需液体产物的活性和选择性。这是由于氢解反应排出了充满液体的催化剂孔，其中长碳链随着氢的添加而断裂，使它们更容易蒸发并从催化剂床中逸出。总体而言，FTS催化剂孔内长链烷烃的氢解反应研究还很少。这尤其是因为经典分析方法（例如气相色谱法或质谱法）只能量化反应器出口流中的产物。因此，该项目旨在利用时间和空间分辨操作磁共振成像（MRI）研究氢解的传质过程。非侵入性 MRI 测量应能够表征整个孔隙消耗过程中反应器和颗粒内部的质量和相变。通过这种方式，将系统地了解蜡填充费托催化剂中孔排空和氢解的动态过程。