Operando Investigation of Heterogeneous Photocatalysis by Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

魔角旋转核磁共振波谱对异相光催化的操作研究

• 批准号: 503810318
• 负责人: Dr. Dorothea Wisser
• 金额: --
• 依托单位: Erlangen Center for Interface Research and Catalysis
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/503810318?language=en
• 关键词: Operando; Investigation; Heterogeneous; Photocatalysis; Magic

Photocatalytic reactions use only sunlight as energy source and are therefore valuable elements in our current economic transition away from fossil fuels. For realistic insights into the ongoing process, photocatalytic transformations should ideally be studied in real time. While MAS NMR spectroscopy is a powerful tool for investigating interfaces and catalytic processes, the operando investigation of heterogeneous photocatalysis is still a great challenge. The goal of this project is the development of light irradiation solid-state NMR spectroscopy under Magic Angle Spinning for the in situ and operando investigation of model photocatalytic reactions over titania. A custom-built MAS NMR probe will allow to irradiate a sample slurry inside a transparent rotor with light of variable wavelengths and intensity. The potential of this methodology will first be demonstrated on the photocatalytic oxidation of small alcohols. Combination of operando techniques with advanced NMR techniques will yield new insights into the structure of the catalyst surface and its interface with the liquid, into reaction mechanisms and deactivation processes. In the last part of the project, we will implement the operando MAS NMR investigation of the photocatalytic reduction of carbon dioxide.

光催化反应只使用阳光作为能源，因此在我们当前的经济转型中是有价值的元素，远离化石燃料。为了对正在进行的过程有实际的了解，光催化转化最好是实时研究的。虽然MAS核磁共振光谱是研究界面和催化过程的有力工具，但多相光催化的操作分子研究仍然是一个巨大的挑战。本项目的目的是开发魔角旋转下的光辐照固体核磁共振波谱技术，用于模拟二氧化钛光催化反应的原位和操作研究。一个定制的MAS核磁共振探针将允许用不同波长和强度的光照射透明转子内的样品浆。这种方法的潜力将首先在小醇的光催化氧化上得到证明。operando技术与先进的核磁共振技术的结合将对催化剂表面结构及其与液体的界面、反应机理和失活过程产生新的见解。在项目的最后一部分，我们将进行光催化还原二氧化碳的operando MAS NMR研究。