The performance of a honeycomb monolith and a fixed-bed of cylindrical extruded HZSM-5 catalyst for the methanol to olefins process (MTO) are evaluated and compared using two-scale two-dimensional heterogeneous models in adiabatic and diabatic operations considering two approaches of “restricted comparison” and “free comparison”. The 53-step elementary reaction mechanism of Mihail and coworkers is used to model the MTO reactions. The effects of space-time (0.1–5 s), feed water content (up to 60 mol%), and monolith cell density (200–600 cpsi) on the catalyst temperature, feed conversion, and selectivity and yield of olefins are investigated. “Restricted comparison” indicates that the feed conversion and selectivity and yield of the total olefins in the monolithic reactor are greater than the fixed-bed with a maximum discrepancy of 5%. There is an optimum space-time of ~ 0.3 s at which the yield of total light olefins in the monolith and fixed-bed reactors achieves the maximum values of 0.45 and 0.43, respectively. The results of “free comparison” reveal that a 600 cpsi monolith can produce ~ 43% more light olefins using ~ 75% less catalyst mass at the optimal space-time of 0.3 s compare with a fixed-bed reactor at an identical specific surface area.

使用二维二维多相模型在绝热和非绝热操作中评估和比较蜂窝整料和圆柱形挤出 HZSM-5 固定床催化剂在甲醇制烯烃工艺 (MTO) 中的性能，考虑两种方法“限制比较”和“自由比较”。Mihail 及其同事的 53 步基本反应机制用于模拟 MTO 反应。研究了时空 (0.1–5 s)、进料水含量 (高达 60 mol%) 和整体电池密度 (200–600 cpsi) 对催化剂温度、进料转化率以及烯烃选择性和产率的影响. “限制比较”表明整体式反应器的进料转化率、选择性和总烯烃产率均高于固定床，最大差异为5%。整体式和固定床反应器中总轻烯烃的产率分别达到最大值 0.45 和 0.43 时，最佳时空时间约为 0.3 秒。“自由比较”的结果表明，与相同比表面积的固定床反应器相比，在 0.3 秒的最佳时空时间下，600 cpsi 的整料可以使用约 75% 的催化剂质量多生产约 43% 的轻质烯烃.