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Synergies between arsenic (As) and potassium (K) species in the deactivation of V 2 O 5 -WO 3 /TiO 2 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 N 2 physisorption, XPS, H 2 -TPR, NH 3 -TPD, NH 3 -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 catalyst, K + further neutralized the As-OH acid sites, and the amount and stability of both Lewis and BrØnsted acid sites decreased more greatly. Potassium also reacted with intermediate NH 2  - when the temperature was elevated to higher than 250 °C, which resulted in more NH 3 consumption and NH 3 -SCR reaction inhibition. The extent of deactivation was related to the potassium species when both poisons reacted on the catalyst, and the influence sequence followed AsKS &lt; AsKN &lt; AsKC. As 2 O 3 + K 2 SO 4 presented the weakest impact among these three poisoned catalysts due to the resistance of SO 4  2- to arsenic.

rsc advances

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