摘要：SummaryIt is still challenging to develop strongly alkali-resistant catalysts for selective catalytic reduction of NOxwith NH3. It is generally believed that the maintenance of acidity is the most important factor because of neutral effects of alkali. This work discovers that the redox properties rather than acidity play decisive roles in improving alkali resistance of some specific catalyst systems. K-poisoned Fe-decorated SO42−-modified CeZr oxide (Fe/SO42−/CeZr) catalysts show decreased acidity but reserve the high redox properties. The higher reactivity of NHxspecies induced by K poisoning compensates for the decreased amount of adsorbed NHx, leading to a desired reaction efficiency between adsorbed NHxand nitrate species. This study provides a unique perspective in designing an alkali-resistant deNOxcatalyst via improving redox properties and activating the reactivities of NHxspecies rather than routinely increasing acidic sites for NHxadsorption, which is of significance for academic interests and practical applications.Graphical AbstractDisplay OmittedHighlights•Fe-decorated SO42−-modified CeZr catalysts exhibit superior alkali resistance•Improved redox properties compensate for the loss of the acidity•Higher reactivity of NHxspecies makes up their decreased quantity•Alkali resistance is enhanced via improving the redox and reactivity of NHxspeciesChemical Engineering; Catalysis; Environmental Chemistry; Environmental Chemical Engineering
