Liquid phase catalytic application of nanoporous gold

纳米多孔金的液相催化应用

• 批准号: 269855001
• 负责人: Dr. Arne Wittstock, since 3/2024
• 金额: --
• 依托单位: Institut für Angewandte und Physikalische Chemie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/269855001?language=en
• 关键词: Liquid; phase; catalytic; application; nanoporous

In this sub-project we will investigate the correlation between composition of npAu catalysts and their resulting catalytic performance for liquid phase oxidation reactions with O2. Modification of the surface by ad-metals such as Ag or Cu will be central means for reaching the objectives.The reactivity of nanoporous Au is a function of its surface composition. This unsupported catalyst with an extended and strongly curved Au surface offers unique possibilities in studying the influence of traces of ad-metals in a nanostructured host material. The presence of an ad-metal such as Ag or Cu will alter the electronic and chemical properties of the surface and by that will have a strong impact on the catalytic activity and selectivity of the material. From the first funding period we know that depending on its concentration the Ag can remain inside the ligaments in the form of clusters. At first we will further investigate the origin and dynamics of formation and dissolution of such clusters, aiming at a direct correlation between bulk and surface concentration of the Ag. Subsequently we will extend this study to Cu containing npAu in the aerobic oxidation of alcohols. Cu turned out to be more reactive but also is prone to oxidation and deactivation. Besides the mechanism of alcohol oxidation we will study possible reactive oxygen surface species such as O, OH and OOH as suggested by DFT calculations. We will study the epoxidation and oxidation of propene as a model reaction.

在这个子项目中，我们将研究npAu催化剂的组成和它们的液相氧化反应与O2的催化性能之间的相关性。通过Ag或Cu等ad-金属对表面进行改性将是实现这些目标的主要手段。纳米多孔Au的反应性是其表面组成的函数。这种无载体的催化剂与扩展和强烈弯曲的Au表面提供了独特的可能性，在研究痕量的广告-金属在纳米结构的主机材料的影响。Ag或Cu等ad金属的存在将改变表面的电子和化学性质，并由此对材料的催化活性和选择性产生强烈影响。从第一个资助期，我们知道，根据其浓度，Ag可以以簇的形式保留在韧带内。首先，我们将进一步研究这种团簇的形成和溶解的起源和动力学，目的是在银的体积和表面浓度之间的直接相关性。随后，我们将这项研究扩展到含铜npAu在有氧氧化醇。Cu被证明更具反应性，但也易于氧化和失活。除了醇氧化的机制，我们将研究可能的活性氧表面物种，如O，OH和OOH的DFT计算建议。我们将以丙烯的环氧化和氧化为模型反应进行研究。