Increased NH3-SCR activity and stability of Fe-Beta catalysts achieved by using Al-rich zeolite

Selective catalytic reduction with NH₃ (NH₃-SCR) is an important means of NO_x abatement from stationary and mobile sources, and the key element is efficient and stable NH₃-SCR catalysts. In this study, we propose a method to construct superior Fe-Beta catalysts based on Al-rich zeolites. This strategy successfully promotes the formation of NH₃-SCR-active isolated Fe³⁺ species, thus effectively improving the low-temperature activity of the Fe-Beta catalysts. Thanks to the abundant Brønsted acid sites of the Al-rich zeolite, the Fe₂O₃ particles are redispersed and anchored as isolated Fe³⁺ during hydrothermal aging. This dynamic evolution of Fe species makes up for the adverse effect of dealumination of the Al-rich zeolite framework and achieves high stability for the Al-rich Fe-Beta catalyst. This study may promote the understanding of highly efficient and stable catalyst design using Al-rich zeolites.