Solid State NMR Studies of Heterogeneous Alumina, Silica and Titania Supported Pt Nanoparticle Catalyst Systems

加氢反应多相催化剂体系的结构-功能关系通常由贵金属催化剂纳米颗粒与其载体材料的相互作用所支撑。本研究采用多核固体核磁共振方法，研究了金属氧化物催化剂在载体材料上原位还原前后催化剂-载体之间的相互作用。许多此类体系都是使用传统技术制造的，其中催化金属物种通过硝酸盐溶液沉积安装在氧化物载体上，这些金属物种随着温度的升高而还原得到金属氧化物纳米颗粒，然后最终金属纳米颗粒与氧化物载体材料相互作用/结合。固体核磁共振是一种短程核磁共振技术，特别适合于研究无序体系和平移对称性降低的小纳米粒子体系。该项目将专注于氧化铂(和氧化镍)颗粒的沉积，195PT核为形成的金属形态提供了一个极好的探针；将使用常规的29Si MAS、27Al MAS和49Ti静态核磁共振技术研究支撑材料。该项目将与世界领先的催化剂生产公司之一的工业合作伙伴(强生马泰)合作进行。

The structure-function relationship of heterogeneous catalyst systems for hydrogenation reactions is often underpinned by the interaction of the precious metal catalyst nanoparticle with its support material. Using a multinuclear solid state NMR approach, this study seeks to explore the catalyst-support interaction prior to and after the reduction of the metal oxide catalyst in situ on the support material. A large range of these systems has been manufactured using conventional techniques where the catalytic metal species are mounted on oxide supports via nitrate solution deposition, and the reduction of these metal species with increasing temperature produces metal oxide nanoparticles, and then eventually metal nanoparticles interacting/bonding with the oxide support material. Solid state NMR is a short-range technique which is particularly suited to studying disordered systems and small nanoparticle systems with reduced translational symmetry. This project will focus on platinum oxide (and nickel oxide) particle deposition, with the 195Pt nucleus providing an excellent probe of the metal speciation formed; the support materials will be studied using conventional 29Si MAS, 27Al MAS, and 49Ti static NMR techniques. This project will be undertaken in conjunction with industrial partners (Johnson Matthey) who are one of the world leading catalyst producing companies.