Unraveling alkali-tolerance role of zeolite coupling CeWOx catalyst for NOx reduction
Applied Catalysis B: Environmental(2023)
摘要
The deactivation of the selective catalytic reduction (SCR) catalysts in the presence of alkali metal is still unsolved to date, there is no fully effective strategy to remedy it. Herein, a series of novel zeolite coupling CeWOx catalysts (CeWOx@ZSM-5) with core-shell structures was synthesized by a simple method. The proposed CeWOx@ZSM-5 catalyst exhibited superior deNOx performance and K-poisoning resistance, which are attributed to the synergy between the shell and active components. The zeolite shell with abundant acid sites can act as a sacrificial agent to preferentially bind to K, thereby decelerating/inhibiting the alkali metal poisoning process of the catalyst. Even after loading 1 wt% K, the NOx conversion remained as high as > 80% at 300–500 °C over the CeWOx@ZSM-5 catalyst under humid conditions. The novel zeolite coupling CeWOx catalyst may serve as a workable reference for new, efficient, and highly poisoning-resistant SCR catalysts for practical application.
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关键词
Nitrogen oxides,Ammonia selective catalytic reduction,Zeolite,CeWOx,K-poisoning resistance
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