A Versatile Route to Fabricate Metal/Uio-66 (Metal = Pt, Pd, Ru) with High Activity and Stability for the Catalytic Oxidation of Various Volatile Organic Compounds

The supported noble metal catalysts have been demonstrated outstanding catalytic performance for the catalytic degradation of volatile organic compounds (VOCs), but their high cost, easy poisoning and sintering deactivation limit their further applications. Herein, we proposed a flexible and universal strategy to prepare the highly dispersed metal nanoparticles (Pt, Pd, Ru) supported on metal-organic frameworks (metal/MOFs) through the impregnation-reduction method for the catalytic oxidation of VOCs. Metal/MOFs integrate the large surface area and high porosity derived from MOFs for supplying VOCs adsorption sites and highly dispersed metal species for offering catalytic active sites. Metal/MOFs catalysts therefore exhibited excellent catalytic performance with nearly 100% conversion efficiency and CO 2 yield for the catalytic oxidation of various VOCs including ethyl acetate, n-hexane and toluene. Besides, a series of metal/MOFs exhibited high reusability, good water resistance as well as excellent stability over 150 h on the on-stream reactions at 260 °C. Furthermore, the catalytic oxidation mechanism and pathways were revealed by the study of active sites and reaction intermediates via X-ray photoelectron spectroscopy (XPS), in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and proton transfer reaction-time of flight mass spectrometer (PTR-TOF-MS). We anticipate that this work may shed light on developing noble metal catalysts supported on porous materials for novel applications in environmental catalysis