Abstract

The main reasons for the promoting effect of phosphorus on the properties of Pd–P/ZSM-5 catalysts during direct synthesis of H₂O₂ from H₂ and O₂ under mild conditions are considered based on the data obtained by X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and inductively coupled plasma mass spectrometry (ICP MS). The introduction of phosphorus in the catalyst affects the particle size and the electronic state of palladium in the surface layer, as well as the surface concentration of the phosphate and phosphite ions. The yield of H₂O₂ increases when the particle size of the Pd–P catalysts decreases, when the side process of H₂O₂ decomposition is inhibited by the phosphate and phosphite surface ions, and when the hydrogen solubility in the solid solutions of phosphorus in palladium decreases.

中文翻译：

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钯磷催化剂在直接合成过氧化氢中的首次应用：磷促进作用的原因

摘要

根据X射线光电子数据，探讨了磷对温和条件下H ₂和O ₂直接合成H 2 O ₂的Pd-P/ZSM-5催化剂性能促进作用的主要原因_。光谱 (XPS)、X 射线粉末衍射 (XRD)、高分辨率透射电子显微镜 (HRTEM) 和电感耦合等离子体质谱 (ICP MS)。催化剂中磷的引入影响表层钯的粒径和电子态，以及磷酸根和亚磷酸根离子的表面浓度。当Pd-P催化剂的粒径减小、磷酸盐和亚磷酸盐表面离子抑制H ₂ O _{2分解的副过程以及固溶体中氢的溶解度时，H 2} O ₂的产率增加。钯中的磷减少。