Antioxidant as Structure Directing Agent in Nanocatalyst Preparation. Case Study: Catalytic Activity of Supported Pt Nanocatalyst in Levulinic Acid Hydrogenation,Industrial & Engineering Chemistry Research

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Antioxidant as Structure Directing Agent in Nanocatalyst Preparation. Case Study: Catalytic Activity of Supported Pt Nanocatalyst in Levulinic Acid Hydrogenation
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-11-15 , DOI: 10.1021/acs.iecr.8b03555
Riny Y. Parapat _{1,

2} , Firman A. Yudatama ₂ , Maya R. Musadi ₂ , Michael Schwarze ₁ , Reinhard Schomäcker ₁

Affiliation

We synthesized Ag, Pd, Pt, and Ru nanoparticles by employing antioxidants in the natural reductants, i.e., green tea leaf, coffee, peppermint leaf, and grape seeds. The results from the characterization with transmission electron microscopy (TEM) show metal nanoparticles with different shapes. The catalytic testing in the hydrogenation of α-methylstyrene (AMS) shows very high activity of the produced Pt nanodendrites. This excellent activity is due to the anisotropic structure of Pt nanodendrites which provides many defects, kinks, steps, and edges, thus providing a high number of active sites. In a challenging reaction such as the hydrogenation of levulinic acid, which is normally carried out at high temperature (100–240 °C) and high pressure (50–100 bar), the produced Pt nanodendrites are already active at much lower reaction conditions (1.3 bar and 70 °C), with an overall performance of about 100% of γ-valerolactone (GVL) selectivity and 94% conversion in 5 h.

中文翻译：

抗氧化剂作为纳米催化剂制备中的结构导向剂。案例研究：负载型Pt纳米催化剂在乙酰丙酸加氢中的催化活性

我们通过在天然还原剂（即绿茶叶，咖啡，薄荷叶和葡萄籽）中使用抗氧化剂来合成Ag，Pd，Pt和Ru纳米粒子。透射电子显微镜（TEM）表征的结果表明，金属纳米颗粒具有不同的形状。α-甲基苯乙烯（AMS）加氢中的催化测试表明，所生产的Pt纳米树枝晶具有很高的活性。这种出色的活性归因于Pt纳米树枝晶的各向异性结构，该结构提供许多缺陷，扭结，台阶和边缘，从而提供了大量的活性位点。在具有挑战性的反应中，例如乙酰丙酸的氢化反应通常在高温（100–240°C）和高压（50–100 bar）下进行，所生成的Pt纳米树枝晶在较低的反应条件下就具有活性（ 1。

更新日期：2019-02-07

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