Ru clusters encapsulated with Al-rich zeolite for efficiently catalytic elimination of 1,2-dichloroethane

The Ru-based catalysts with different preparation methods or supports were achieved and applied in efficiently catalytic elimination of 1,2-dichloroethane (1,2-DCE). It was firstly found that the redox ability and chlorine resistance of the catalyst could be improved by regulating the interaction between Ru and supports. Compared with other supports and conventionally impregnated methods, the Ru@ZSM-5 catalyst synthesized by the in-situ encapsulation strategy exhibited an excellent low-temperature catalytic performance ( T 50  = 262°C, T 90  = 327°C), superior stability in long-term test as well as ideal target products. The acidity, specific surface area, and interaction with precious metals of the supports have significant influences on the catalytic activity, and the Ru clusters inside the pore structures are more closely bound to the framework Al species, which promotes the oxidation behavior. The encapsulation strategy also significantly improves the Ru dispersion thereby facilitates oxygen activation as well as Cl-containing volatile organic compounds (CVOCs) deep oxidation, and preserves large amounts of Brønsted acid sites to optimize the hydrolysis mechanism for purification of CVOCs. Subsequently, the synergistic effect between metal redox and acidity is greatly optimized, thus extremely promoting the catalytic efficiency of 1,2-DCE oxidation.