Phase control of heterogeneous 1T/2H-MoS2 to improve the selective catalytic reduction activity of VMo/Ti

• Published in: Surfaces and interfaces Vol. 46; p. 103780
• Main Authors: Kim, Su-Jin, Kim, Donghyeok, Lee, Myeung-Jin, Kim, Woon-Gi, Jeong, Bora, Ye, Bora, Kim, Hong-Dae
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2024
• Subjects: 1T/2H-MoS2; 2D materials; NH3-SCR catalyst; Phase control; VMo/TiO2 catalyst; NH3-SCR catalyst; 1T/2H-MoS2; VMo/TiO2 catalyst; Phase control; 2D materials
• ISSN: 2468-0230; 2468-0230
• DOI: 10.1016/j.surfin.2023.103780

V2O5-WO3(MoO3)/TiO2 catalysts have been widely used for NOX removal owing to their excellent catalytic performance; however, they suffer from a narrow operating temperature range, reduced N2 selectivity at a high temperature, and deteriorated activity due to SO2 poisoning. In this study, a phase-controlled 1T/2H-MoS2 was prepared by a one-step hydrothermal method and used as a Mo precursor to develop V-Mo/Ti catalysts with improved selective catalytic reduction (SCR) performance. Raman analysis confirmed that the heterogeneous MoS2 contains a partially formed 1T phase, which facilitated the generation of active sites in the catalyst. The heterogeneous 1T/2H-MoS2 also produced a considerable amount of surface oxygen species on the V-Mo/Ti catalyst, which increased the V4+/(V4++V5+) ratio. The resulting catalyst maintained a NOX conversion of over 96% from 250°C to 400°C and demonstrated excellent N2 selectivity and resistance to SO2 poisoning. [Display omitted]