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<p>Direct synthesis of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>, DSHP) from hydrogen (H<sub>2</sub>) and oxygen (O<sub>2</sub>) is considered the most promising preparation method due to its atomic economy and compliance with the requirements of green chemistry. However, the poor H<sub>2</sub>O<sub>2</sub> yield and selectivity still greatly limit its practical application. Herein, we synthesized a series of oxidized palladium and metal palladium composites (Pd<sup>2+</sup>–Pd) using a controlled decomposition method, to develop efficient catalysts for DSHP. The optimized 4% PdBr<sub>2</sub>–Pd/C-250-2 catalyst exhibited the excellent catalytic performance for DSHP, with H<sub>2</sub>O<sub>2</sub> selectivity of 99.2%, H<sub>2</sub>O<sub>2</sub> yield of 346.53&#xa0;mol·<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11244_2025_2138_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{kg}}_{{{\text{cat}}{\text{.}}}}^{{ - 1}}\)</EquationSource> </InlineEquation>·h<sup>− 1</sup>, and H<sub>2</sub> conversion of 50.7%. The finding indicates that the enhanced catalytic performance of 4% PdBr<sub>2</sub>–Pd/C-250-2 is due to the coexistence of PdBr<sub>2</sub>, PdO, and Pd, which not only effectively activates H<sub>2</sub> and O<sub>2</sub>, but also effectively inhibits the breaking of O–O bonds, greatly reducing the decomposition and hydrogenation activity of H<sub>2</sub>O<sub>2</sub>, thereby achieving high H<sub>2</sub>O<sub>2</sub> yield and selectivity. This article provides important ideas for the development of efficient DSHP catalysts and will promote their industrial applications.</p>

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Palladium Bromide–Palladium Composite for Direct Synthesis of Hydrogen Peroxide

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Qiujing Fu,
  • Weihan Zhang,
  • Shuxing Bai

摘要

Direct synthesis of hydrogen peroxide (H2O2, DSHP) from hydrogen (H2) and oxygen (O2) is considered the most promising preparation method due to its atomic economy and compliance with the requirements of green chemistry. However, the poor H2O2 yield and selectivity still greatly limit its practical application. Herein, we synthesized a series of oxidized palladium and metal palladium composites (Pd2+–Pd) using a controlled decomposition method, to develop efficient catalysts for DSHP. The optimized 4% PdBr2–Pd/C-250-2 catalyst exhibited the excellent catalytic performance for DSHP, with H2O2 selectivity of 99.2%, H2O2 yield of 346.53 mol· \({\text{kg}}_{{{\text{cat}}{\text{.}}}}^{{ - 1}}\) ·h− 1, and H2 conversion of 50.7%. The finding indicates that the enhanced catalytic performance of 4% PdBr2–Pd/C-250-2 is due to the coexistence of PdBr2, PdO, and Pd, which not only effectively activates H2 and O2, but also effectively inhibits the breaking of O–O bonds, greatly reducing the decomposition and hydrogenation activity of H2O2, thereby achieving high H2O2 yield and selectivity. This article provides important ideas for the development of efficient DSHP catalysts and will promote their industrial applications.