Fe_(2)O_(3)对ZrTiO_(4)载体NH_(3)-SCR催化性能的影响  

Effect of Fe_(2)O_(3)on ZrTiO_(4)support for NH_(3)-SCR catalytic performance

作　　者：袁龙腾 胡平[1,2,3] 胡卜亮 韩嘉彧[1,3] 马升捷 杨帆 Alex A.Volinsky[4] YUAN Long-teng;HU Ping;HU Bo-liang;HAN Jia-yu;MA Sheng-jie;YANG Fan;Alex A.Volinsky(National and Local Joint Engineering Research Functional Center for Materials Processing,Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Mechanical and Electrical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Metallurgy Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Department of Mechanical Engineering,University of South Florida,Tampa 33620,USA)

机构地区：[1]西安建筑科技大学材料加工国家与地方联合工程研究功能中心,陕西西安710055 [2]西安建筑科技大学机电工程学院,陕西西安710055 [3]西安建筑科技大学冶金工程学院,陕西西安710055 [4]南佛罗里达大学机械工程系33620,美国

出　　处：《燃料化学学报（中英文）》2023年第12期1843-1855,共13页Journal of Fuel Chemistry and Technology

基　　金：the Scientific and Technological Innovation Team Project of the Shaanxi Innovation Capability Support Plan,China(2022TD-30);the Youth Innovation Team of Shaanxi Universities(2019-2022);the Top Young Talents Project of“Special support program for high-level talents”in the Shaanxi Province(2018-2023);the International Science and Technology Cooperation Program of the Shaanxi Province(2022KW-39);Xi’an Science and Technology Planning Project(2022JH-RYFW-0196).

摘　　要：NH_(3)-SCR催化剂主要用于工业生产和汽车尾气清洁,本研究采用“共沉淀-浸渍法”制备了新型α%Fe_(2)O_(3)/ZrTiO_(4)(α=0、8、12、15)催化剂。结果表明,α%Fe_(2)O_(3)/ZrTiO_(4)催化剂的最佳成分配比的12%Fe_(2)O_(3)/ZrTiO_(4)催化剂在250−400℃条件下NO_(x)转化率大于80%,在300℃时NO_(x)转化率接近100%,并且N2选择性在200−450℃大于90%。在ZrTiO_(4)表面负载Fe_(2)O_(3)后,催化剂的氧化还原性能、表面酸度和Oβ/(Oα+Oβ)比例都有所提高,这不仅归因于α%Fe_(2)O_(3)/ZrTiO_(4)催化剂具有多孔结构,还归因于活性组分Fe_(2)O_(3)和载体ZrTiO_(4)之间的电子相互作用。此外,原位DRIFTs反应表明,12%Fe_(2)O_(3)/ZrTiO_(4)催化剂的NH_(3)-SCR反应遵循Eley-Rideal机制。明确的反应机制有利于更深入了解SCR过程中NO_(x)转化的反应过程。这项工作为未来Fe基SCR催化剂在中温范围内替代V基催化剂提供了可行的策略。The selective catalytic reduction(SCR)NH_(3)catalyst is mainly used in industrial production and automobile exhaust cleaning.In this study,a novelα%Fe_(2)O_(3)/ZrTiO_(4)(α=0,8,12,15)catalyst was prepared by the coprecipitation impregnation method.The results show that the NO_(x)conversion rate of 12%Fe_(2)O_(3)/ZrTiO_(4)catalyst with the optimal composition is high above 80%at 250−400°C,close to 100%at 300°C,and N2 selectivity is high above 90%at 200−450°C.The redox properties,surface acidity,and Oβ/(Oα+Oβ)ratio of ZrTiO_(4)catalysts are improved after loading Fe_(2)O_(3)on the ZrTiO_(4)surface,which is attributed not only to the porous structure ofα%Fe_(2)O_(3)/ZrTiO_(4)catalyst but also to the synergistic interaction between the active component Fe_(2)O_(3)and the support ZrTiO_(4).In addition,in-situ DRIFT reactions show that the NH_(3)-SCR reaction of 12%Fe_(2)O_(3)/ZrTiO_(4)catalyst follows the Eley-Rideal mechanism.A clear reaction mechanism is conducive to a deeper understanding of the reaction process of NO_(x)conversion during SCR.This work provides a feasible strategy for Fe-based SCR catalysts to replace V-based catalysts in the medium temperature range in the future.

关 键 词：Fe_(2)O_(3)/ZrTiO_(4)催化剂 NH_(3)-SCR 多孔 反应机制 

分 类 号：O643.36[理学—物理化学]