Excellent MCM‐49 Supported CeCuO_x Nanocatalyst with Ultrawide Operating Temperature Window and Strong Anti‐Alkali Ability for NH₃‐SCR

Abstract NO_x is a common atmospheric pollutant, and NH₃‐SCR technology efficiently purifies it. CeCuO_x binary‐oxide nanoparticles were synthesized and loaded onto acid MCM‐49 molecular sieve with a large specific surface area to increase acid sites and disperse active sites of the catalyst. The optimized 35 % CeCu/MCM‐49 catalyst effectively purified over 80 % of NO_x in the temperature range of 200–500 °C and demonstrated excellent resistance to alkali metals, such as K, Na, and Ca. Even after K poisoning, it still removed over 80 % of NO_x in the range of 200–450 °C. Various characterization methods, including XRD, FT‐IR, TEM, and N₂ isotherm adsorption‐desorption tests, confirmed the structure of the catalyst remained intact after poisoning with no substance change, nor agglomeration of nanoparticles. NH₃‐TPD and H₂‐TPR confirmed that the catalyst had effective acidity and redox capacity that were not affected by alkali metals. In‐situ DRIFTs showed that the catalytic reaction predominant mechanism shifted from L−H to E−R mechanism after poisoning. This study provides valuable insights into the development of high‐performance Ce‐based NH₃‐SCR catalysts with alkali metal resistance.