Abstract Nitrogen oxides (NOx) and sulfur dioxide (SO2) are common gaseous pollutants in the flue gas of stationary resources, such as thermal power plants. The undesired oxidation of SO2 on the catalytic monolith for Selective Catalytic Reduction (SCR) with ammonia will cause deposition of ammonium bisulfate, corrosion and extra pressure drop to downstream devices. A dual-layer model of catalytic monolith was established in this work to thoroughly investigate the effects of active layer thickness on SCR reaction and SO2 oxidation under various operating parameters. Besides, the influences of different sizes of nanopore in catalyst on both reactions are discussed. Thus, optimal parameters and suggestions were given for the design of SCR catalytic monolith with low SO2 oxidation.

中文翻译：

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双层NH3-SCR整体料中SO2低氧化最佳活性层厚度和孔径的数值模拟研究

摘要 氮氧化物 (NOx) 和二氧化硫 (SO2) 是火力发电厂等固定资源烟气中常见的气态污染物。SO2 在用氨进行选择性催化还原 (SCR) 的催化整料上发生的不希望的氧化将导致硫酸氢铵沉积、腐蚀和对下游设备的额外压降。在这项工作中建立了催化整体的双层模型，以深入研究活性层厚度对各种操作参数下 SCR 反应和 SO2 氧化的影响。此外，还讨论了催化剂中不同尺寸的纳米孔对两种反应的影响。因此，给出了低SO2氧化SCR催化整体设计的最佳参数和建议。