An in-situ DRIFTs study of Mn doped FeVO4 catalyst by one-pot synthesis for low-temperature NH3-SCR. (1st February 2022)

• Record Type: Journal Article
• Authors: Xie, Heng; Shu, Daobing; Chen, Tianhu; Liu, Haibo; Zou, Xuehua; Wang, Can; Han, Zhengyan; Chen, Dong
• Is Part Of: Fuel. Volume 309(2022)
• Publication Date: 2022-02-01
• Subjects: NH3-SCR -- One-pot -- In-situ DRIFTs -- Fast SCR; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2021.122108
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphic abstract: Highlights: Novel x Mn-FeV catalysts were prepared through the "one-pot method". 0.3Mn-FeV catalyst showed a 100% NO x conversion rate at 225 °C. Mn improved the crystal structure of catalysts, maintained the higher-valence V. The SCR reaction at 175 °C presented as "standard SCR" and "fast SCR." Abstract: Manganese doped FeVO4 catalysts were synthesized through a novel "one-pot method, " and the influence of Mn doping on FeVO4 in the selective catalytic reduction of NO x with NH3 (NH3 -SCR) reaction was in-depth studied. The 0.3Mn-FeV catalyst showed superior deNO x performance, reaching a 100% NO x conversion rate at 250 °C as a remarkable catalyst. The study of XRD, HR-TEM, XPS, H2 -TPR, and NH3 -TPD results showed that the introduction of Mn improved the crystal size, the acidity and redox of the catalyst, and maintained the V species in a higher valence state, which is conducive to activation of NH3 . The SCR reaction performed on 0.3Mn-FeV at 175 °C followed the Langmuir-Hinshelwood (L-H) mechanism. The reaction was presented as two types: "standard SCR" and "fast SCR." The Eley-Rideal (E-R) mechanism was mainly introduced at 250 °C, and the –NH2 species played a crucial factor in determining the NO reduction rate.