New insights into the deactivation mechanism of V₂O₅-WO₃/TiO₂ catalyst during selective catalytic reduction of NO with NH₃: synergies between arsenic and potassium species.

ABSTRACT: Synergies between arsenic (As) and potassium (K) species in the deactivation of V₂O₅-WO₃/TiO₂ catalyst were investigated. Both arsenic oxide and potassium species presented a serious poisoning impact on catalyst activities, and the extent of poisoning of (As + K) was much stronger than their single superposition. The intrinsic reasons were explored and analyzed by N₂ physisorption, XPS, H₂-TPR, NH₃-TPD, NH₃-DRIFTS and in situ FTIR. Results indicated that BET surface area decreased due to the formation of a dense arsenic coating on the catalyst surface. V-OH active sites were destroyed by arsenic and As-OH acid sites were newly generated. After potassium species were added to arsenic-poisoned cata

SUBMITTER: Li L 

PROVIDER: S-EPMC9075767 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature