Monolith reactors (MR) have structured packing of catalyst and are commonly used for catalytic converters in automobile applications. Compared to a randomly packed bed reactor (PBR), MR has advantages like lower pressure drop, enhanced mass transfer, etc. Recent investigations have revealed that MR performs better than PBR for certain applications including highly exothermic reactions, mainly because of better conduction in the former. Hence, the use of MR for the process of unmixed combustion (UMC)/chemical looping combustion (CLC) which is typically carried out in PBR and involves oxidation of copper (Cu), an exothermic gas–solid reaction, was investigated using modeling and simulation studies. A Pseudo-homogeneous model was developed and two cases were considered, viz. Case I: insulated wall, and Case II: convective heat transfer from the wall to coolant air. COMSOL Multiphysics™ 5.4 was used for this purpose. The heat transfer behavior of MR was compared with PBR based systems having spherical particles. The simulation results showed that for Case I, it is possible to achieve a high temperature outlet stream (>1200 K) for a longer duration of time in MR as compared to that obtained in the existing CLC based PBR. In Case II, the MR system showed a better rate of radial heat transfer, while maintaining the bed temperatures within the desired range, than that in the PBR system for similar operating conditions. Moreover, in the MR system, there is scope for increasing the heat transfer rate, whereas PBR has process limitations to do so. Effects of inlet concentration and inlet velocity on the performance of reactors have also been investigated. MR was found to have a feasible operation at relatively higher concentrations and velocities. Thus MR proves to be a potential alternative to PBR, for the oxidation of Cu in UMC/CLC processes.

整体式反应器（MR）具有催化剂的规整填料，通常用于汽车应用中的催化转化器。与随机填充床反应器（PBR）相比，MR具有诸如低压降，传质增强等优点。最近的研究表明，在某些应用中，包括高放热反应，MR的性能优于PBR。前任的。因此，通过建模和研究，研究了将MR用于非混合燃烧（UMC）/化学循环燃烧（CLC）的过程，该过程通常在PBR中进行，涉及铜（Cu）的氧化，放热气固反应。模拟研究。建立了伪均质模型，并考虑了两个案例。案例一：保温墙，案例二：从壁到冷却空气的对流热传递。为此目的使用了COMSOL Multiphysics™5.4。将MR的传热性能与具有球形颗粒的PBR基系统进行了比较。仿真结果表明，对于案例I，与在现有的基于CLC的PBR中获得的高温出口流相比，MR可以在更长的时间内实现高温出口流（> 1200 K）。在情况II中，与类似操作条件下的PBR系统相比，MR系统显示出更好的径向传热速率，同时将床温保持在所需范围内。此外，在MR系统中，存在提高传热速率的空间，而PBR具有这样做的工艺限制。还研究了入口浓度和入口速度对反应器性能的影响。发现MR在相对较高的浓度和速度下具有可行的操作。因此，在UMC / CLC工艺中，对于铜的氧化，MR被证明是PBR的潜在替代品。