电力科技与环保2025，Vol.41Issue(5)：702-715,14.DOI:10.19944/j.eptep.1674-8069.2025.05.002
燃气轮机高温SCR核壳结构催化剂研究进展
Research progress on core-shell structured catalysts for high-temperature SCR in gas turbines
摘要
Abstract
[Objective]Core-shell structured catalysts have garnered widespread attention in the field of selective catalytic reduction(SCR)due to their unique structural and chemical properties.Therefore,it is essential to thoroughly understand the performance and mechanisms of core-shell catalysts to provide crucial technical support for denitrification of high-temperature exhaust gases from gas turbines.[Methods]Based on a brief introduction to the current status of high-temperature pollution from gas turbines and denitrification technologies,this paper systematically reviews the research progress of core-shell structured catalysts in high-temperature SCR.It focuses on summarizing the preparation methods,structural characteristics,and performance of metal oxide-based and zeolite-based core-shell catalysts in high-temperature SCR.By analyzing the synergistic effects at the core-shell interface,optimization of mass transfer in gradient pore channels,and the role of physicochemical barriers,the intrinsic mechanisms for performance enhancement are elucidated.[Results]The results indicate that core-shell structured catalysts significantly enhance high-temperature SCR performance through mechanisms such as core-shell interfacial synergy,spatial confinement,and functional zoning.Metal oxide-based core-shell catalysts(e.g.,CeO2@TiO2)improve NOx conversion and resistance to sulfur poisoning by enhancing interfacial oxygen vacancy concentration and physical barrier effects.Studies show that SiO2 modification increases the NOx conversion rate by 12%at 250-400 ℃,and the activity retention rate in flue gas containing 5×10-⁵ SO2 and 10%H2O improves from 58%for conventional catalysts to 89%.Zeolite-based core-shell catalysts achieve high activity and stability over a wide temperature window(200-550 ℃)through gradient pore design and bimetallic synergy.For instance,the combination of K+-exchanged Cu/SAPO-34 core with Fe/Beta shell synergistically ensures high stability in the presence of H2O/CO2,with NOx conversion exceeding 95%.The synergy between Fe3+and Cu2-in Fe-Cu bimetallic SSZ-13 broadens the temperature window to 200-550 ℃,with NOx conversion exceeding 90%.The core-shell structure also effectively inhibits the erosion of active sites by toxic substances such as alkali metals,SO2,and H2O,thereby extending the catalyst lifespan.[Conclusion]Future research should focus on the in situ characterization of the dynamic evolution mechanisms at the core-shell interface,investigations into the tolerance mechanisms of catalysts under complex flue gas environments,and the engineering transition from laboratory powder catalysts to monolithic catalysts,to promote the large-scale application of core-shell catalysts in high-temperature SCR systems for gas turbines.关键词
燃气轮机尾气/选择性催化还原/核壳催化剂/高温脱硝/抗中毒性能Key words
gas turbine exhaust gas/selective catalytic reduction/core-shell catalyst/high-temperature denitration/anti-poisoning performance分类
能源科技引用本文复制引用
张耀宇,李坤鹏,姚展鹏,黄硕,钟雨琴,陈峥,秦凯,盛重义,杨柳..燃气轮机高温SCR核壳结构催化剂研究进展[J].电力科技与环保,2025,41(5):702-715,14.基金项目
国家自然科学基金项目(52470121) （52470121）
国家自然科学基金青年项目(2250060380) （2250060380）
江苏省自然科学基金项目(BK20240597) （BK20240597）
低碳智能燃煤发电与超净排放全国重点实验室开放课题(D2023FK096) （D2023FK096）
