The deactivation of zeolite catalyst H-ZSM-5 by coking during the conversion of methanol to hydrocarbons was monitored by high-energy space- and time-resolved operando X-ray diffraction (XRD) . Space resolution was achieved by continuous scanning along the axial length of a capillary fixed bed reactor with a time resolution of 10 s per scan. Using real structural parameters obtained from XRD, we can track the development of coke at different points in the reactor and link this to a kinetic model to correlate catalyst deactivation with structural changes occurring in the material. The “burning cigar” model of catalyst bed deactivation is directly observed in real time.

中文翻译：

---

甲醇转化为汽油过程中沸石催化剂H-ZSM-5失活：Operando时间和空间分辨X射线衍射

通过高能空间和时间分辨操作X射线衍射（XRD）监测在甲醇转化为烃期间焦化引起的沸石催化剂H-ZSM-5的失活。通过沿毛细管固定床反应器的轴向长度连续扫描（每次扫描的时间分辨率为10 s）来实现空间分辨率。使用从XRD获得的真实结构参数，我们可以跟踪反应器中不同点处焦炭的发展，并将其链接到动力学模型，以将催化剂失活与材料中发生的结构变化相关联。直接实时观察到催化剂床失活的“燃烧雪茄”模型。