The insight into the role of CeO2 in improving low-temperature catalytic performance and SO2 tolerance of MnCoCeOx microflowers for the NH3-SCR of NOx

被引：78

作者：

Wang, Xinbo ^{[1
]}

Duan, Ruibin ^{[3
]}

Liu, Wei ^{[2
]}

Wang, Dawei ^{[2
]}

Wang, Baorui ^{[1
]}

Xu, Yurong ^{[1
]}

Niu, Cihang ^{[1
]}

Shi, Jian-Wen ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Ctr Nanomat Renewable Energy, Sch Elect Engn, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Peoples R China

[2] Qiyuan Xian Dae Young Environm Protect Technol Co, Xian 710018, Peoples R China

[3] Guangdong Prov Acad Bldg Res Grp Co Ltd, Guangzhou 510530, Guangdong, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2020年 / 510卷

基金：

中国国家自然科学基金;

关键词：

Selective catalytic reduction; De-NOx; Low temperature; SO2; tolerance; CeO2; MnCoOx; MANGANESE OXIDE CATALYSTS; CARBON NANOTUBES; SCR REACTION; MNOX-CEO2; CATALYSTS; MN/TIO2; ENHANCED NH3-SCR; MIXED OXIDES; REDUCTION; NH3; MECHANISM;

D O I：

10.1016/j.apsusc.2020.145517

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：

A new MnCoCeOx microflower is rationally designed by a series of elaborate steps for the selective catalytic reduction (SCR) of NOx with NH3. The MnCoOx microflower is firstly synthesized by the self-assembly of Mn-Co mixed oxide nanosheets, and then CeO2 nanoparticles are in-situ grown on the surface of Mn-Co mixed oxide nanosheets by dipping MnCoOx microflower in Ce(NO3)(3) solution followed by a heat-treatment. The resultant MnCoOx microflower presents significantly enhanced low-temperature catalytic performance and SO2 tolerance. It is revealed that the attached CeO2 plays several important roles in the improvement of low-temperature de-NO2 performance, such as decreasing the apparent activation energy, increasing the ratios of Ce3+/Cen+, Mn4+/Mn+ and O-alpha/(O-alpha + O-beta), enhancing the oxidation ability of MnCoO(x )at low temperatures. Moreover, by preventing MnCoOx from being vulcanized into metal sulfate species, CeO2 plays an important role in enhancing the resistance to SO2 poisoning. The in-situ DRIFTS results disclose that the NH3 coordinated on Lewis acid sites, NH4+ bound to Bronsted acid sites, the NO2 and bidentate nitrates linked on metal oxides are the major reactive species on MnCoCeO(x )catalyst, which occur SCR de-NOx reaction following both Eley-Rideal and Langmuir-Hinshelwood mechanisms.

引用

页数：10

共 64 条

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[Anonymous], [No title captured]

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