NH3-SCR催化剂水热失活机制与水热稳定性提升策略研究进展OA
Research progress on hydrothermal deactivation mechanisms of NH3-SCR catalysts and strategies to enhance their hydrothermal stabilities
在重型柴油车国Ⅵ排放标准技术路线中,柴油颗粒捕集器(DPF)的主动再生会使后端的NH3选择性催化还原(NH3-SCR)催化剂处于高温水热环境中.因此,开发在该条件下综合性能稳定的催化剂具有较高的应用价值.系统综述了NH3-SCR催化剂的水热失活机制与稳定性提升策略.首先,聚焦分子筛催化剂,分析了水热老化导致的骨架脱铝与活性金属物种迁移聚集的协同失活机制;随后,针对金属氧化物催化剂,阐述了载体相变、活性相结晶和表面活性位点损失的热失活机制.在此基础上,从分子筛组成优化、助剂添加和骨架结构调控等方面,总结了提升水热稳定性的主要策略.最后,对未来高水热稳定性NH3-SCR催化剂的开发前景进行了展望.
In the technical approach to meeting the China VI emission standards for heavy-duty diesel vehicles,the active regeneration of diesel particulate filter(DPF)subjects the downstream ammonia selective catalytic reduction(NH3-SCR)catalysts to a high-temperature hydrothermal environment.Therefore,developing catalysts with stable comprehensive performance under such conditions holds significant application value.The hydrothermal deactivation mechanisms and stability enhancement strategies of NH3-SCR catalysts were systematically reviewed.Firstly,focusing on zeolite catalysts,the synergistic deactivation mechanism caused by hydrothermal aging,which involves framework dealumination,migration and aggregation of active metal species,was analyzed.Subsequently,for metal oxide catalysts,the intrinsic thermal deactivation essence,which includes carrier phase transformation,active phase crystallization and loss of surface active sites was elucidated.Based on this,the main strategies for enhancing hydrothermal stability were summarized,including zeolite composition optimization,additive addition and framework structure regulation.Finally,the development prospects of NH3-SCR catalysts with high hydrothermal stabilities in the future were discussed.
朱莹;李博
中石化石油化工科学研究院有限公司,北京 100083中石化石油化工科学研究院有限公司,北京 100083
化学化工
NH3选择性催化还原水热稳定性分子筛催化剂金属氧化物催化剂
NH3 selective catalytic reductionhydrothermal stabilitieszeolite catalystsmetal oxide catalysts
《低碳化学与化工》 2026 (8)
60-72,13
中石化石油化工科学研究院有限公司院控课题(PR20232142).
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