The inhibition mechanism of N2O generation in NH3-SCR process by water vapor

被引：2

作者：

Li, Junchen ^{[1
]}

Zhang, Cheng ^{[1
]}

Fang, Dingli ^{[1
]}

Zheng, Zhao ^{[1
]}

Zhao, Yan ^{[1
]}

Tan, Peng ^{[1
]}

Fang, Qingyan ^{[1
]}

Chen, Gang ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2025年 / 485卷

基金：

中国国家自然科学基金;

关键词：

Selective catalytic reduction (SCR); N 2 O inhibition; Formation mechanism; Anatase TiO2 {001} facets; SELECTIVE CATALYTIC-REDUCTION; ANATASE TIO2; 001; FACETS; NOX; PERFORMANCE; TITANIA; NANOSHEETS; OXIDATION; DRIFTS; SITES;

D O I：

10.1016/j.jhazmat.2024.136881

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

N2O is a typical by-product in the NH3-SCR process, which requires urgent resolution due to its negative economic and environmental impacts. This study investigates in detail the mechanism of N2O generation on the surface of the Mn-Ce/TiO2 catalyst (Mn-Ce/TiO2-ZS) with anatase {001} facets preferentially exposed. The deep oxidation of NH3 and *NH2 capture of NO via O2 were proved to be the dominant N2O generation pathways. The production of N2O was remarkably reduced by the introduction of a low percentage of water vapor (H2O). The results revealed that low percentage of H2O was capable of enhancing the acid sites on the catalyst surface and facilitating the generation of active hydroxyl species. These active species inhibited the deep dehydrogenation of ammonia and the disintegration of nitrate species on the catalyst surface, as well as suppressing the generation of N2O.

引用

页数：15

共 61 条

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