Impact of Alkali Metals on CeO2-WO3/TiO2 Catalysts for NH3-Selective Catalytic Reduction and Lifetime Prediction of Catalysts DOI Creative Commons

Mutao Xu,

Yuhang Deng,

Xingxiu Gao

и другие.

Molecules, Год журнала: 2024, Номер 29(23), С. 5570 - 5570

Опубликована: Ноя. 25, 2024

Ce-based catalysts have been widely used in the removal of nitrogen oxides from industrial flue gas because their good catalytic performance and environmental friendliness. However, mechanism alkali metal poisoning remains to be further studied. This work involves preparation K/Na-poisoned CeWTi catalyst via impregnation method for assessing its NO removal. Experiments show that both K Na exhibit detrimental effects on catalyst, loading reduces specific surface area pore volume catalyst. Furthermore, presence alkaline metals results a notable decline acid concentration, particularly Lewis sites. Concurrently, levels Ce3+, oxygen vacancies, reducing agents decrease, leading diminished reduction capability eventual deactivation. The application BP neural network activity prediction yielded an average relative error approximately 0.73%, indicating enhanced accuracy outcomes. explored cause provided effective lifetime which theoretical guidance engineering catalysts.

Язык: Английский

Effect of Citric Acid Modification on Denitration Performance of CeO2-WO3/TiO2 Catalyst DOI

Yang Yuming,

Xue Bian, Feng Xie

и другие.

Applied Catalysis A General, Год журнала: 2025, Номер unknown, С. 120121 - 120121

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Selective Catalytic Reduction of NO by NH3 and SOx Poisoning Mechanisms on Mn3O4 Catalysts: A Density Functional Investigation DOI Open Access
Houyu Zhu, Zhong Liu, Xiaoxin Zhang

и другие.

Catalysts, Год журнала: 2025, Номер 15(3), С. 241 - 241

Опубликована: Март 3, 2025

Mn-based oxides are promising catalysts for the selective catalytic reduction (SCR) of NOx by NH3 at low temperatures. However, fundamental NH3-SCR mechanisms and resistance against SOx remain controversial. This study employed density functional theory (DFT) calculations to explore intrinsic poisoning on Mn3O4(001). Both NO adsorb atop surface Mn site (the Lewis acid site). In contrast traditional Langmuir–Hinshelwood (L-H) mechanism in which gaseous is first oxidized form adsorbed nitrites or nitrates then react with NHx species produce H2O N2, a new potential L-H pathway proposed that involves adsorbing reacting NH* generate key intermediate NHNO*, followed formation N2. more efficient as it bypasses oxidation step N2 avoiding N2O production. addition, favorable than Eley–Rideal (E-R) because lower free energy profile. SO2 exhibits limited effects, whereas SO3 strongly poisons Mn3O4(001) occupying adsorption sites, hindering producing ammonium bisulfate.

Язык: Английский

Процитировано

0
Synthesis of Titanium-based Alloys from Spent SCR Catalysts: A Novel Approach DOI Creative Commons

Zhenyun Tian,

Weichao Zheng,

Liu Yang

и другие.

Journal of Materials Research and Technology, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

0
Research Progress in the Composition and Performance of Mn-Based Low-Temperature Selective Catalytic Reduction Catalysts DOI Creative Commons
Yuming Yang, Xue Bian, Feng Xie

и другие.

Applied Sciences, Год журнала: 2024, Номер 14(22), С. 10198 - 10198

Опубликована: Ноя. 6, 2024

NH3 selective catalytic reduction (NH3-SCR) is the most prevalent and effective method for removing nitrogen oxides. Over past few decades, manganese (Mn)-based catalysts have demonstrated strong activity been extensively studied low-temperature NH3-SCR reactions. This paper provides an in-depth introduction to four forms of Mn-based catalysts: single oxide-based catalysts, binary metal oxide ternary multivariate nano-Mn-based catalysts. Advances made in enhancing catalysts’ redox performance acidity, increasing active component’s dispersion, lowering binding energy, enlarging specific surface area, raising Mn4+/Mn3+ ratio, enriching adsorbed oxygen by optimizing preparation methods, altering oxidation state components, modifying crystal phases, adjusting morphology along with various modifications. The mechanism reactions has elucidated using characterization techniques. Finally, research directions future prospects are discussed, aiming accelerate commercial application new

Язык: Английский

Процитировано

1
Impact of Alkali Metals on CeO2-WO3/TiO2 Catalysts for NH3-Selective Catalytic Reduction and Lifetime Prediction of Catalysts DOI Creative Commons

Mutao Xu,

Yuhang Deng,

Xingxiu Gao

и другие.

Molecules, Год журнала: 2024, Номер 29(23), С. 5570 - 5570

Опубликована: Ноя. 25, 2024

Ce-based catalysts have been widely used in the removal of nitrogen oxides from industrial flue gas because their good catalytic performance and environmental friendliness. However, mechanism alkali metal poisoning remains to be further studied. This work involves preparation K/Na-poisoned CeWTi catalyst via impregnation method for assessing its NO removal. Experiments show that both K Na exhibit detrimental effects on catalyst, loading reduces specific surface area pore volume catalyst. Furthermore, presence alkaline metals results a notable decline acid concentration, particularly Lewis sites. Concurrently, levels Ce3+, oxygen vacancies, reducing agents decrease, leading diminished reduction capability eventual deactivation. The application BP neural network activity prediction yielded an average relative error approximately 0.73%, indicating enhanced accuracy outcomes. explored cause provided effective lifetime which theoretical guidance engineering catalysts.

Язык: Английский

Процитировано

1