Abstract Catalyst deactivation by carbon deposition is an important phenomenon of catalytic industrial processes, which will lead to the decrease of reaction rates and even the blockage of the reactor. In this work, coke deposition process is investigated by means of a particle-resolved CFD model considering the change of catalyst physical property and activity caused by carbon formation. The spatial and instantaneous distributions of coke deposition in the single catalyst particle and packed bed are evaluated. Meanwhile, the interaction of reaction performance and catalyst activity under coke deposition is further analyzed. The results reveal that the local catalyst activity is different from the core to the shell zone. In addition, the wall effect on coke accumulation in a fixed bed is revealed. The results indicate that more coke is formed near the wall with lower catalyst activity.

中文翻译：

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使用粒子分辨 CFD 模型评估催化剂粒子中的焦炭沉积

摘要 催化剂积炭失活是催化工业过程中的一个重要现象，会导致反应速率下降甚至反应器堵塞。在这项工作中，考虑到由碳形成引起的催化剂物理性质和活性的变化，通过粒子分辨 CFD 模型研究了焦炭沉积过程。评估了单个催化剂颗粒和填充床中焦炭沉积的空间和瞬时分布。同时，进一步分析了焦炭沉积下反应性能与催化剂活性的相互作用。结果表明，局部催化剂活性从核到壳区是不同的。此外，还揭示了固定床中焦炭堆积的壁效应。