Ceria-Supported Bimetallic RuPt Alloy for Enhanced Chlorine-Tolerance Catalysis

The development of catalysts with high chlorine resistance is crucial for mitigating catalyst chlorination and secondary pollution during the catalytic destruction of chlorinated volatile organic compounds (CVOCs). By tailoring the d-band center, we have designed and synthesized ceria-supported bimetallic RuPt alloy catalysts that effectively destruct CVOCs while generating fewer polychlorinated byproducts compared to Ru/CeO2. The incorporation of Pt induces tensile strain on the Ru lattice, leading to a downward shift in the d-band center of Ru, which weakens the adsorption of chlorine dissociated from the CVOCs. Furthermore, theoretical calculations indicate that the RuPt bimetallic alloy exhibits reduced mobility on the CeO2 surface, revealing an enhanced thermal-chemical stability of Ru by the introduction of Pt at elevated temperatures. The RuPt/CeO2 alloy catalyst exhibits optimal catalytic activity and maintains long-term stability for the destruction of monochloromethane (MCM), outperforming both Ru/CeO2 and Pt/CeO2. Our work advances the understanding of chlorine-resistant active site structures and provides a foundation for the efficient development of high chlorine-resistant catalysts.