Silica-Confined Ru Species Highly Dispersed on the Porous Ce-Modified ZrO₂ Matrix with Different Redox and Acidity Properties for the Catalytic Combustion of 1,2-Dichloroethane

The RuO₂@Ce_mZr_1−mO₂−SiO₂ catalysts were synthesized by the spontaneous deposition method. Based on the XRD patterns of various RuO₂@Ce_mZr_1−mO₂−SiO₂ catalysts, it was suggested that the Ru noble metal nanoparticles were distributed with high dispersion on the surface of Ce-modified porous matrix of ZrO₂. H₂-TPR and NH₃-TPD confirmed that all catalysts possessed superior redox ability as well as acidity, which were facilitated to the catalytic dichloroethane (DCE) oxidation. From the systematic study of texture structure, surface properties and catalytic activity, we knew that acid sites were shown to be favorable for adsorption as well as activation of DCE and improve the anti-poisoning property of the catalyst, and the redox ability could facilitate the further oxidation of the intermediate. The optimized RuO₂@Ce_0.1Zr_0.9O₂−SiO₂ catalyst exhibited superior activity (T₉₀=275 °C at a space velocity of 15000 h⁻¹), good stability (at 300 °C for 50 h) and outstanding tolerance towards moisture (in 5 % moisture). Our work demonstrated the important role of acidity and redox ability over these functionalized catalysts, providing guidance for the advanced catalyst design.