Insights into the catalytic activity and recyclability of Pt deposited on PDA encapsulated porous silica toward hydrosilylation reaction

IF 2.1 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Organometallic Chemistry Pub Date : 2025-05-06 DOI:10.1016/j.jorganchem.2025.123703

Zhiqing Liu , Zepan Sun , Haifeng Zhang , Yajing Pan , Pei Liu , Chonggang Wu , Tao Hu

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引用次数: 0

Abstract

Mussel inspired polydopamine (PDA) has been extensively applied as a linker in noble metal based heterogeneous catalysts to promote either metal dispersion or metal-support interaction. Herein, three heterogeneous Pt catalysts were first prepared by depositing Pt on PDA encapsulated porous silica (SiO₂-PDA-Pt) with different PDA coating degree and their catalytic activity toward two model hydrosilylation reactions between methyldichlorosilane and a non-polar 1-octene and a polar allyl cyanide were investigated. Meanwhile, stability and recyclability of these catalysts were also explored. Results show that PDA coating degree may directly influence both Pt loading and its oxidation state, which then resultantly tailor the activity of the supported catalysts. The SiO₂-PDA-Pt catalysts all showed excellent activity even after six catalytic rounds even though a gradual loss of Pt species were observed. Among them, the activity of the one with lowest PDA coating exhibited both higher activity and better recyclability, which is mainly ascribed to a higher content and retention of more active low valent Pt⁰ species that may be well stabilized by proper PDA coating.

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PDA包封多孔二氧化硅上沉积Pt对硅氢化反应的催化活性和可回收性研究

贻贝激发的聚多巴胺（PDA）作为一种连接剂广泛应用于贵金属基非均相催化剂中，以促进金属分散或金属负载相互作用。本文首先在不同PDA包覆度的PDA包覆多孔二氧化硅（SiO2-PDA-Pt）上沉积Pt，制备了3种多相Pt催化剂，并考察了它们对甲基二氯硅烷与非极性1-辛烯和极性烯丙基氰化物之间两种模型硅氢化反应的催化活性。同时对催化剂的稳定性和可回收性进行了探讨。结果表明，PDA的包覆程度直接影响Pt的负载和氧化状态，从而影响负载催化剂的活性。sio_2 - pda -Pt催化剂在经过6轮催化后仍然表现出良好的活性，尽管观察到Pt物种的逐渐损失。其中，活性最低的PDA涂层的活性较高，可回收性较好，这主要是由于活性较低的低价Pt0物质含量和保留率较高，通过适当的PDA涂层可以很好地稳定Pt0物质。

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

Journal of Organometallic Chemistry 化学-无机化学与核化学

CiteScore

4.40

自引率

8.70%

发文量

221

审稿时长

36 days

期刊介绍： The Journal of Organometallic Chemistry targets original papers dealing with theoretical aspects, structural chemistry, synthesis, physical and chemical properties (including reaction mechanisms), and practical applications of organometallic compounds. Organometallic compounds are defined as compounds that contain metal - carbon bonds. The term metal includes all alkali and alkaline earth metals, all transition metals and the lanthanides and actinides in the Periodic Table. Metalloids including the elements in Group 13 and the heavier members of the Groups 14 - 16 are also included. The term chemistry includes syntheses, characterizations and reaction chemistry of all such compounds. Research reports based on use of organometallic complexes in bioorganometallic chemistry, medicine, material sciences, homogeneous catalysis and energy conversion are also welcome. The scope of the journal has been enlarged to encompass important research on organometallic complexes in bioorganometallic chemistry and material sciences, and of heavier main group elements in organometallic chemistry. The journal also publishes review articles, short communications and notes.