Comparative Studies of Effects of Vapor- and Liquid-Phase As₂O₃ on Catalytic Behaviors of V₂O₅-WO₃/TiO₂ Catalysts for NH₃-SCR.

ABSTRACT: The role of vapor- and liquid-phase As₂O₃ in deactivating commercial V₂O₅-WO₃/TiO₂ catalyst during the NH₃-selective catalytic reduction (SCR) process was explored and compared. As₂O₃ was loaded via vapor deposition (As(vap)) and the wet impregnation (As(imp)) method, respectively. Results demonstrated that the poisoning extent of vapor arsenic was much stronger than in the liquid state. Differences in As distribution on the catalyst surface was one of the main causes. Most vapor As₂O₃ could be oxidized to As₂O₅, which underwent stacking and formed a dense covering layer on the catalyst surface. In comparison, liquid As₂O₃ coul

SUBMITTER: Zhang H 

PROVIDER: S-EPMC7528200 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature