In situ construction of heteroatom F-doped Mn3O4 spinel catalysts with robust activity and SO2 resistance for NH3-SCR at low temperature

被引：42

作者：

Chen, Chong ^{[1
]}

Wang, Yunxia ^{[1
]}

Li, Junxi ^{[1
]}

Tian, Fengyu ^{[1
]}

Chen, Weijuan ^{[1
]}

Feng, Chao ^{[1
]}

Pan, Yuan ^{[1
]}

Liu, Yunqi ^{[1
]}

机构：

[1] China Univ Petr East China, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 338卷

基金：

中国国家自然科学基金;

关键词：

NH3-SCR; MOFs; Electron transfer; SO2; resistance; REDUCTION; NH3; NO; NANOFIBERS; MECHANISM; FLUORINE; INSIGHT; SCR; N-2;

D O I：

10.1016/j.apcatb.2023.123086

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：

Herein, we propose a novel in situ construction method of F-doped Mn3O4 catalysts through a crystallizationpyrolysis-oxidation strategy. The F-Mn3O4-3 % exhibits a NO conversion above 90 % from 150 degrees to 310 degrees C at an ultra-high GHSV of 400,000 h-1. The SO2 resistance is also significantly improved compared to pure Mn3O4. Doping of Mn3O4 with F increases the surface acidity and tunes the electronic properties of the catalysts. The increase of acid sites not only facilitates the adsorption of NH3 species, thereby improving NH3-SCR activity, but also inhibits SO2 adsorption on the catalyst surface. The electron conduction between SO2 and Mn3+ can also be effectively inhibited after F replaces O, resulting in the F-doped Mn3O4 catalysts can selectively oxidizing NO to NO2 rather than oxidizing SO2 to SO3, thereby causing the decrease of sulfate species. Our work provides a novel idea for the design of SCR catalysts with high activity and SO2 resistance.

引用

页数：12

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