Pt/Al2O3 for Efficient CF4 Hydrolytic Decomposition

Tetrafluoromethane (CF4) is one of the most stable perfluorinated compounds because of its highly symmetric molecular structure and extremely strong C–F bonds. Catalytic hydrolysis provides a promising route for CF4abatement, yet the development of efficient catalysts capable of activating C–F bonds at reduced temperatures remains challenging. Herein, Pt-modified Al2O3catalysts were prepared to promote CF4decomposition through the regulation of surface acidity, CF4adsorption, and hydroxyl formation. NH3temperature-programmed desorption revealed that Pt introduction significantly enhanced the surface acidity of Al2O3, while CF4temperature-programmed desorption demonstrated strengthened CF4adsorption over Pt/Al2O3. In situ infrared spectroscopy further showed that Pt incorporation promoted the generation of surface hydroxyl groups under reaction-relevant conditions. These hydroxyl species are proposed to participate in C–F bond activation during CF4hydrolysis. As a result, Pt/Al2O3achieved complete CF4decomposition at 600 °C and maintained excellent stability during the long-term test, clearly outperforming pristine Al2O3. This work demonstrates that Pt/Al2O3is an effective catalyst for CF4decomposition by coupling enhanced acidity, improved CF4adsorption, and hydroxyl-assisted C–F bond activation.