Progress in the Development of SCR Denitration Catalysts with Resistance of High-temperature Deactivation

被引：0

作者：

Lu Q. ^{[1
]}

Wu Y. ^{[1
]}

Xu M. ^{[1
]}

Qu Y. ^{[2
]}

Wang H. ^{[1
]}

Pei X. ^{[1
]}

Ouyang H. ^{[1
]}

机构：

[1] National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing

[2] Beijing National Power Group Co., Ltd., Beijing

来源：

Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 13期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

catalysts; deactivation; high temperature; NO[!sub]x[!/sub] emissions; selective catalytic reduction (SCR);

D O I：

10.11896/cldb.20090242

中图分类号：

学科分类号：

摘要：

The V2 O5 -WO3 (MoO3 ) / TiO2 catalysts are widely utilized in the commercial fields of selective catalytic reduction (SCR) denitration. However, many factors can result in the deactivation of the catalysts in the process of SCR denitration operation, especially in the industrial processes of waste incinerators and oil/ gas turbines, among which the thermal deactivation in high-temperature flue gas is important. This review summarizes the deactivation mechanisms of the SCR catalysts at high temperatures, including the crystalline transformation of TiO2 support, the catalytic oxidation of NH3 by V2O5, and the competitive adsorption between water vapor and NH3. Then, the developments of SCR denitration catalysts with the resistance of high-temperature deactivation are presented, i.e., improving the thermal stability of support and inhibiting the catalytic oxidation of gaseous NH3. Ti-based composite supports, including Ti-Zr/ Ti-Si supports and zeolites, are considered to be optimal for improving the thermal stability of support, while metal oxides, such as Fe2O3 and WO3, are the main active components to prevent the NH3 catalytic oxidation. In addition,the technologies for the thermal resistance improvement of SCR denitration catalysts are briefly discussed, including the addition of anti- water components and the application of hydrophobic supports. With the presence of anti-water components such as noble metals (Pt, Pd) and metal oxides (WO3, CeO2), the adsorption of gaseous reactants over the catalyst can be promoted. Besides, using the hydrophobic carriers, such as zeolites and carriers coated with water-resistant layers, can also suppress the adsorption of water vapor. Finally, the developing prospects of SCR denitration catalysts with superior resistance to high temperature are discussed. This review can provide some fundamental instructions for the improvement of SCR denitration catalysts with the resistance of thermal deactivation in the high-temperature flue gas. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.

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