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首页> 外文期刊>Catalysis science & technology >One-pot two-step rapid synthesis of 3-aminopropyltrimethoxysilane-mediated highly catalytic Ag@(PdAu) trimetallic nanoparticles
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One-pot two-step rapid synthesis of 3-aminopropyltrimethoxysilane-mediated highly catalytic Ag@(PdAu) trimetallic nanoparticles

机译：锅两步快速合成3-aminopropyltrimethoxysilane-mediated高度催化Ag@ PdAu trimetallic纳米颗粒

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Synergistic interactions between individual components of multimetallic nanoparticles result in dramatic changes in important physical or chemical properties that outclass those of monometallic nanoparticles in many aspects. Rapid synthesis under ambient conditions of multimetallic nanoparticles having potential for conversion from a homogeneous suspension to a solid matrix without compromising the catalyzing ability remains a daunting challenge. In an attempt to meet such challenges, trimetallic Ag@(PdAu) nanoparticles involving the active role of 3-aminopropyltrimethoxysilane (3-APTMS) were fabricated and evaluated as catalysts in both homogeneous and heterogeneous phases using the model reaction of p-nitrophenol reduction [k = 0.14 +/- 0.0025 s(-1) for Ag@(PdAu)NPs]. The synthesis process involves the sequential addition of Ag+ over (PdAu) bimetallic nanoparticles, made by simultaneous reduction of 3-APTMS-capped metal cations (Pd2+, Au3+) in the presence of formaldehyde. 3-APTMS not only assists in nanoparticle synthesis but also promotes the conversion of a homogeneous nanoparticle suspension to a solid matrix, a prerequisite for heterogeneous catalysts, by initiating Si-O-Si linkages in the presence of hydrochloric acid. The results based on UV-vis spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy clearly demonstrate the synthesis of trimetallic nanoparticles within seconds under ambient conditions. Characterization data reveal that AgNPs not only form alloys with AuNPs but also form pear-shaped structures physically attached over simultaneously made (PdAu) core-shell nanoparticles, when present in excess. A gradual increase in the catalytic behavior of the nanomaterials is recorded in the order of PdNPs < (PdAu) NPs < Ag@(PdAu)NPs.
机译：协同个体之间的相互作用组件的多金属纳米粒子的结果在重要的物理或戏剧性的变化化学性质,远胜于那些的单本位制的纳米粒子在许多方面。在环境条件下合成的多金属纳米粒子具有潜力转换从一个均匀悬浮固体矩阵在不影响催化能力仍是一个令人畏惧的挑战。为了应对这些挑战,trimetallicAg@ (PdAu)纳米颗粒的积极作用3-aminopropyltrimethoxysilane (3-APTMS)制作和评估作为催化剂在两种同类和异类阶段使用模型反应p-nitrophenol减少[k =0.14 + / - 0.0025秒(1)Ag@ PdAu NPs)。合成过程包括顺序添加Ag) + (PdAu)双金属纳米颗粒,同时减少3-APTMS-capped金属阳离子(Pd2 + Au3 +)甲醛的存在。协助纳米颗粒合成也促进一个齐次的转换纳米颗粒悬浮固体矩阵,异构催化剂的先决条件启动Si-O-Si联系的存在盐酸。光谱、透射电子显微镜和x射线光电子能谱演示trimetallic的合成环境下纳米颗粒在几秒钟内条件。AgNPs不仅与AuNPs也形成合金物理上连接形成梨形结构对同时(PdAu)核壳纳米颗粒,当出现在过剩。增加的催化行为纳米材料的顺序记录PdNPs <

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