Evolution mechanism of NOx in NH3-SCR reaction over Fe-ZSM-5 catalyst: Species-performance relationships

被引：37

作者：

Wang, Pan ^{[1
]}

Yu, Dan ^{[1
]}

Zhang, Lidong ^{[2
]}

Ren, Yanlun ^{[3
]}

Jin, Miaomiao ^{[1
]}

Lei, Lili ^{[1
]}

机构：

[1] Jiangsu Univ, Sch Automot & Traff Engn, Zhenjiang 212013, Jiangsu, Peoples R China

[2] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China

[3] East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

来源：

APPLIED CATALYSIS A-GENERAL | 2020年 / 607卷

基金：

中国国家自然科学基金;

关键词：

NOx reduction; Fe-ZSM-5; Intermediate species; Active sites; Reaction pathway; FE-EXCHANGED ZEOLITES; HYDROTHERMAL STABILITY; CU-SAPO-34; CATALYST; ION-EXCHANGE; NITRIC-OXIDE; REDUCTION; NH3; TEMPERATURE; SCR; CU;

D O I：

10.1016/j.apcata.2020.117806

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Fe-based zeolites are known for desired high-temperature activity in the selective catalytic reduction of NOx by NH3, and species-performance relationships over Fe-ZSM-5 were systematically investigated in this study. Via activity tests, characterization and TOF calculation, it was found that both the relative amount and the real content of active Fe species played vital roles in the catalytic activity. The weakened high-temperature acid sites and stronger NH3 oxidation caused by oligomeric Fe and FexOy species could account for the decreased high-temperature activity over Fe-ZSM-5 with a high Fe loading. N2O formation via nitrate decomposition was barely found over Fe-ZSM-5 with Fe content of 1.0 wt%, the "L-H" and "E-R" pathway could coexist in the SCR reaction as suggested by DRIFT studies. DFT calculation showed that [Fe-NO2]-1 was the most easily generated and the formation of [Fe-NO2]-1/[FeO-NO] was the rate limiting step in the calculated reaction pathways of NO2 and NH3.

引用

页数：11

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