Yadong Wu, JinJuan Li, JianGang Zhang
Hazardous solid waste [e.g., barium slag (BS)] can be transformed into highly efficient molecular sieve catalysts. However, catalyst deactivation caused by SO 2 poisoning remains a critical scientific challenge that requires urgent attention. Herein, V/Fe/BS-ZSM-5 molecular sieves have been devised for the NH 3 -SCR for NO removal reaction, showing improved SO 2 resistance. This protection includes a two-step protection process: first, Ba 2+ acts as a sacrificial agent by reacting with SO 2, and subsequently, the resulting BaSO 4 layer serves as a physical barrier. A range of advanced characterization methods (e.g., H 2 -TPR, NH 3 -TPD, TG, and in situ DRIFTS spectroscopy) were employed to gain a more comprehensive understanding of the catalyst’s resistance to sulfur poisoning and its underlying reduction mechanism. The results demonstrate that the VFBZ x catalysts possess remarkable resistance to SO 2 and maintain stable catalytic performance, which can be ascribed to a dual-protection mechanism. The incorporation of Ba 2+ significantly inhibits how SO 2 moves through the catalyst, thus restricting sulfation to the catalyst layers. Subsequently, the BaSO 4 coating acts as an additional protective barrier on the catalyst surface, suppressing SO 2 adsorption and preventing the active metal sites (V 5+ –O v –Fe 3+ interfacial sites) from being poisoned. This material is expected to effectively convert BS into high-value zeolite materials through a simple synthesis method, showing promising commercial potential.