Promoting the Direct H2O2 Generation Catalysis by Using Hollow Pd–Sn Intermetallic Nanoparticles
Junbo Zhang, Qi Shao, Ying Zhang, Shuxing Bai, Yonggang Feng, and Xiaoqing Huang*（黄小青）
College of Chemistry ，Chemical Engineering and Materials Science，Soochow University，Jiangsu 215123, China
Small 2018, 14, 1703990
Although direct hydrogen (H2) oxidation to hydrogen peroxide (H2O2) is considered as a promising strategy for direct H2O2synthesis, the desirable conversion efficiency remains formidable challenge. Herein, highly active and selective direct H2oxidation to H2O2is achieved by using hollow Pd–Sn intermetallic nanoparticles (NPs) as the catalysts. By tuning the catalytic solvents and catalyst supports, the efficiency of direct H2oxidation to H2O2can be optimized well with the hollow Pd2Sn NPs/P25 exhibiting H2O2selectivity up to 80.7% and productivity of 60.8 mol kgcat−1h−1. 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 Pd2Sn NPs/P25 is due to its higher content of metallic Pd and higher ratio of Snx+, which benefit H2O2production and selectivity.