Simultaneous modification of redox and acidic properties of FeOx catalysts derived from MIL-100(Fe) via HPW incorporation for NH3-SCR

被引：6
|
作者：
Jiang, Miao [1 ,2 ]
Yan, Zidi [1 ]
Zhang, Yanshuang [1 ]
Zhang, Chunlei [1 ]
Chang, Chuang [1 ]
Xiao, Min [1 ]
Ruan, Luna [1 ]
Yan, Yong [1 ]
Yu, Yunbo [1 ,2 ,3 ]
He, Hong [1 ,3 ]
机构：
[1] Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341000, Peoples R China
[2] Nanchang Univ, Sch Resources & Environm, Nanchang 330031, Jiangxi, Peoples R China
[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2024年 / 358卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
MOFs; Selective catalytic reduction; Iron-based oxide catalysts; Acid sites; Redox sites; METAL-ORGANIC FRAMEWORK; MIXED-OXIDE CATALYST; IN-SITU DRIFTS; LATTICE OXYGEN; SCR REACTION; REDUCTION; NOX; NH3; PERFORMANCE; OXIDATION;
D O I：
10.1016/j.apcatb.2024.124416
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：
Utilizing MIL-100(Fe) as the precursor, Fe-based catalysts were developed for NH3-SCR, which served as the matrix to incorporate acidic promoters, phosphotungstic acid (HPW) through hydrothermal (HT), impregnation (IM), and grinding (GR). The HT-prepared HPW-FeOx(MOFs)-HT outperformed others, achieving over 90 % NOx conversion across 205-470 degrees C and maintaining similar activity even with 5 vol% H2O presents. This method fostered a beneficial interaction between W and Fe, leading to the formation of gamma-Fe2O3 and an increase in active oxygen species, which enhanced NO adsorption and activation for faster SCR. Over HPW-FeOx(MOFs)-HT, NH3-TPD analysis confirmed HPW's role in augmenting the total acidic site along with promoting the reactivity of NH3 adsorbed at Lewis acidic site at low temperature, demonstrating the catalyst's high-temperature SCR efficacy through strategic molecular and structural optimization.
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页数：11
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