Promoting distribution of surface-active sites by regulates interfacial binding of TiO2 and Pt using organic acid: stable Cl-VOCs catalytic properties

Abstract

The Pt-based catalyst for purifying chlorinated volatile organic compounds (Cl-VOCs) has the advantages of high catalytic efficiency and low ignition temperature, but the problem of poor resistance to chlorine and water poisoning has not been effectively solved. A series of 0.5 Pt-Ti catalysts were prepared for chlorobenzene (CB) catalytic oxidation by adjusting the interfacial stability and dispersibility of the TiO₂ and Pt through the organic acid strategy in this study. The introduction of tartaric acid (TA) effectively enhanced the surface reduction performance of 0.5Pt-Ti-TA and the proportion of Pt⁴⁺ on the surface. In addition, TA can strongly coordinate with Ti center to form stable titanium-containing complexes, improve the dispersion of Pt, prevent particles from agglomerating, and make the distribution of active sites more uniform. The designed 0.5Pt-Ti-TA exhibits excellent chlorine and water resistance at 300℃ (5 %H₂O, 500 ppm CB), and has a higher potential of application.