Abstract

In tubular reactors, the pressure drop can be decreased, and the heat transfer can be enhanced by coating the catalyst on its inner-wall when compared with the performance of fixed-bed types. This study focused on preparing catalyst coatings in capillary tubes for hydrocarbon cracking. The effect of pretreatment processes on the physicochemical properties of the catalyst was studied, and the influence was negligible. In addition, the preparation process was optimized by adjusting the coating method, binder types and contents. The coating prepared using 10 wt% organic binder with an interval coating method showed optimal adhesion. The mass loss was 3.92% after thermal shock and ultrasonic oscillation treatment. During n-dodecane cracking, the gas production rate (GPR) without coating was 8.27%, while that were 31.62% and 65.42% with ZSM-5 and MFI coatings, respectively. Above all, the coatings inhibited coke formation so that the reaction could be continuously performed at 600 °C.

摘要

在管式反应器中，与固定床式反应器相比，可以通过在其内壁涂覆催化剂来降低压降，并增强传热。本研究的重点是在毛细管中制备用于烃裂化的催化剂涂层。研究了预处理工艺对催化剂理化性质的影响，影响可以忽略不计。此外，通过调整包衣方法、结合剂种类和含量，优化了制备工艺。使用 10 wt% 有机粘合剂通过间隔涂覆方法制备的涂层显示出最佳附着力。热冲击和超声振荡处理后的质量损失为3.92%。在n-十二烷裂解，无涂层的产气率（GPR）为8.27%，而有ZSM-5和MFI涂层的产气率（GPR）分别为31.62%和65.42%。最重要的是，涂层抑制了焦炭的形成，因此反应可以在 600 °C 下连续进行。