Tailored nanocomposites through the controlled reduction of metal nanoparticle-MOF templates.

通过金属纳米颗粒-MOF 模板的受控还原来定制纳米复合材料。

• 批准号: 1941437
• 金额: --
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1941437
• 关键词: Tailored; nanocomposites; through; controlled; reduction

The development of efficient catalysts is dependent on preparing materials, both metals and metal oxides, of controlled size, shape, and composition. The combination of metal nanoparticles (NPs) and semiconductor metal oxide supports provide highly active heterojunctions, which are known to promote chemical reactions. Recently, we have demonstrated how metal nanoparticles deposited on metal organic framework (MOF) architectures can be used as templates to prepare tailored metal/metal oxide composites; in this instance PdCu NPs deposited on the semiconductor Cu2O. These samples proved highly active for the hydrogenation of 4-nitrophenol, demonstrating significantly higher activity than our standard Pd/TiO2 catalysts. This proof-of-concept study has provided exciting preliminary results, which support the need for further investigation. The PdCu/Cu2O system alone has significant potential applications in photocatalysis, methanol synthesis, and formic acid decomposition. PdCu NPs and Cu2O have innate characteristics, which make them valuable catalytic materials, however, the synergy between the two systems, has the potential to provide further benefits. This project seeks to understand how these metal nanoparticle/MOF materials can be used to control the resultant metal/metal oxide interface and ultimately their catalytic properties. To answer these questions the project will rely heavily on the facilities at Diamond Light Source. The structures of the nanoparticles will be characterised using X-ray absorption fine structure (XAFS-B18,I20), whilst changes to the MOF architecture will be assessed using PDF (I15) and conventional diffraction techniques (I11). The potential of SAXS to understand the nature of these composites will also be explored. (I22, B21). Moreover, we will use operando methods to understand i) the formation of these materials and ii) how the structures of these tailored composites affect catalytic processes.

高效催化剂的开发依赖于制备具有受控尺寸、形状和组成的材料，包括金属和金属氧化物。金属纳米颗粒（NP）和半导体金属氧化物载体的组合提供高活性异质结，已知其促进化学反应。最近，我们已经证明了沉积在金属有机框架（MOF）架构上的金属纳米颗粒如何可以用作模板来制备定制的金属/金属氧化物复合材料;在这种情况下，PdCu纳米颗粒沉积在半导体Cu 2 O上。这些样品被证明对4-硝基苯酚的氢化具有高活性，表现出比我们的标准Pd/TiO 2催化剂显著更高的活性。这项概念验证研究提供了令人兴奋的初步结果，支持进一步调查的必要性。单独的PdCu/Cu 2 O体系在催化裂化、甲醇合成和甲酸分解中具有重要的潜在应用。PdCu NPs和Cu 2 O具有固有的特性，这使它们成为有价值的催化材料，然而，两个系统之间的协同作用具有提供进一步益处的潜力。该项目旨在了解这些金属纳米颗粒/MOF材料如何用于控制所得金属/金属氧化物界面，并最终控制其催化性能。为了回答这些问题，该项目将在很大程度上依赖于钻石光源的设施。纳米颗粒的结构将使用X射线吸收精细结构（XAFS-B18，I20）来表征，而MOF结构的变化将使用PDF（I15）和常规衍射技术（I11）来评估。SAXS了解这些复合材料的性质的潜力也将进行探讨。(I22，B21）。此外，我们将使用操作方法来理解i）这些材料的形成和ii）这些定制复合材料的结构如何影响催化过程。