Promoting the Direct H O Generation Catalysis by Using Hollow Pd-Sn Intermetallic Nanoparticles.

Although direct hydrogen (H ) oxidation to hydrogen peroxide (H O ) is considered as a promising strategy for direct H O synthesis, the desirable conversion efficiency remains formidable challenge. Herein, highly active and selective direct H oxidation to H O is achieved by using hollow Pd-Sn intermetallic nanoparticles (NPs) as the catalysts. By tuning the catalytic solvents and catalyst supports, the efficiency of direct H oxidation to H O can be optimized well with the hollow Pd Sn NPs/P25 exhibiting H O selectivity up to 80.7% and productivity of 60.8 mol kg h . In situ diffuse reflectance infrared Fourier transform spectroscopy of CO adsorption results confirm the different surface atom arrangements between solid and hollow Pd-Sn NPs. X-ray photoelectron spectra results show that the higher efficiency of Pd Sn NPs/P25 is due to its higher content of metallic Pd and higher ratio of Sn , which benefit H O production and selectivity.