College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, PR China; State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China.
State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China.
Chemosphere. 2022 Sep;302:134740. doi: 10.1016/j.chemosphere.2022.134740. Epub 2022 Apr 27.
The low-temperature SCR of NO by NH is restricted in application since the catalysts is easily poisoned by sulfur and water. The Fe modified Mn-Co-Ce/TiO/SiO catalysts synthesized via impregnation method and sulfating were evaluated for low-temperature NH-SCR in the presence of SO and HO. The calcination temperature and loading amounts of Mn, Fe, Co and Ce were optimized. Adding of Fe into S-MnCoCe/Ti/Si played an important role in resistance to sulfur and water poisoning. The optimal calcination temperature was 380 °C and the optical mass loading of the catalyst was 10% of Mn, 10% of Fe, 1% of Co and 4% of Ce. The optimal S-MnFeCoCe/Ti/Si catalyst maintained high NO conversion of 93% at reaction temperature of 160 °C in the presence of 50 ppm SO and 10 vol% HO. The catalytic activity did not continue to fall after two times of repeated used in the temperature range of 100-200 °C, indicating its excellent sulfur and water durability and stability in the presence of SO and HO. The interaction between MnO and FeO enhanced sulfur and water durability rather than other bi-metal interactions. Furthermore, the mechanism of Fe improving resistance to SO and HO was discussed.
NH 低温 SCR 脱硝技术由于催化剂易受硫和水的毒害而受到限制。采用浸渍法和硫酸盐化法合成了 Fe 改性的 Mn-Co-Ce/TiO/SiO 催化剂，并在 SO 和 HO 存在下评价了其在低温下的 NH-SCR 性能。优化了煅烧温度和 Mn、Fe、Co 和 Ce 的负载量。在 S-MnCoCe/Ti/Si 中添加 Fe 对硫和水的毒害具有重要的抗作用。最佳煅烧温度为 380°C，催化剂的最佳光学质量负载为 10%的 Mn、10%的 Fe、1%的 Co 和 4%的 Ce。在 50 ppm SO 和 10%vol%HO 的存在下，最佳的 S-MnFeCoCe/Ti/Si 催化剂在 160°C 的反应温度下保持了 93%的高 NO 转化率。在 100-200°C 的温度范围内，两次重复使用后催化活性没有继续下降，表明其在 SO 和 HO 存在下具有优异的耐硫耐水性和稳定性。MnO 和 FeO 之间的相互作用增强了耐硫耐水性，而不是其他双金属相互作用。此外，还讨论了 Fe 提高对 SO 和 HO 抗性的机理。
