平板式抗砷中毒SCR脱硝催化剂在高砷烟气中活性变化研究

为研究某高砷煤燃煤电厂在役板式抗砷中毒SCR脱硝催化剂的活性变化和脱硝塔不同部位催化剂受烟气的影响，分别对新鲜催化剂和运行1年催化剂进行脱硝活性测试，并通过X射线原子荧光（XRF）、N2吸附/脱附、X射线光电子能谱（XPS）和粒径分析等表征手段进行分析。结果表明，在350℃烟气条件下，运行1年后催化剂的脱硝活性相对于新鲜催化剂有所下降，由94.52%降到最低77.12%，仍表现出较好的抗砷中毒性能；同时，催化剂中累积了大量砷元素，上下层催化剂中砷的平均含量分别达到了10.47%和9.28%；通过表征分析发现，2层催化剂同时发生了砷的物理和化学中毒，上层催化剂主要发生砷的物理中毒，而下层催化剂主要发生砷的化学中毒。

Research on the Activation Change of Plate-Type Anti-arsenic-poisoning SCR De-NOx Catalyst in High-Arsenic Flue Gas

To research the activity change and the influence of flue gas for different parts catalysts in high-arsenic coal-fired power plant, fresh catalyst and one-year-used catalysts from different parts were selected for denitrification activity tests, and characterizations including X-ray fluorescence (XRF), N₂ adsorption/desorption, X-ray photoelectron spectroscopy (XPS), and particle size analysis were conducted. The results showed that under 350°C, the activity of the one-year-used catalysts (at least 77.12%) was lower than that of the fresh catalyst (94.52%), indicating that the plate-type catalyst showed good resistance to arsenic. A large amount of arsenic had been accumulated in the one-year-used catalysts, and the average arsenic content of the upper and lower catalysts had reached 10.47% and 9.28% respectively. Through characterization and analysis, it was found that the upper and lower catalysts were both physically and chemically poisoned by arsenic. The major deactivation factor for the upper catalysts was physical blockage, while the chemical deactivation was dominant for the catalysts in the lower layer.