The First Application of Palladium–Phosphorus Catalysts in the Direct Synthesis of Hydrogen Peroxide: Reasons for the Promoting Action of Phosphorus

IF 1.3 4区化学 Q4 CHEMISTRY, PHYSICAL

Kinetics and Catalysis Pub Date : 2023-12-12 DOI:10.1134/S0023158423060022

L. B. Belykh, N. I. Skripov, T. P. Sterenchuk, V. V. Akimov, V. L. Tauson, M. N. Likhatski, E. A. Milenkaya, T. A. Kornaukhova, F. K. Schmidt

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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.

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钯磷催化剂在直接合成过氧化氢中的首次应用：磷的促进作用的原因

摘要根据 X 射线光电子能谱 (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) 获得的数据，探讨了在温和条件下由 H2 和 O2 直接合成 H2O2 的过程中磷对 Pd-P/ZSM-5 催化剂性能产生促进作用的主要原因。催化剂中引入磷会影响表面层钯的粒度和电子状态，以及磷酸盐和亚磷酸酯离子的表面浓度。当 Pd-P 催化剂的粒度减小、磷酸根和亚磷酸根表面离子抑制 H2O2 分解的副反应过程以及磷在钯中的固溶体中的氢溶解度降低时，H2O2 的产率就会增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.