Hartman Thomas, Weckhuysen Bert M
Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.
Chemistry. 2018 Mar 12;24(15):3733-3741. doi: 10.1002/chem.201704370. Epub 2018 Feb 1.
Raman spectroscopy is known as a powerful technique for solid catalyst characterization as it provides vibrational fingerprints of (metal) oxides, reactants, and products. It can even become a strong surface-sensitive technique by implementing shell-isolated surface-enhanced Raman spectroscopy (SHINERS). Au@TiO and Au@SiO shell-isolated nanoparticles (SHINs) of various sizes were therefore prepared for the purpose of studying heterogeneous catalysis and the effect of metal oxide coating. Both SiO - and TiO -SHINs are effective SHINERS substrates and thermally stable up to 400 °C. Nano-sized Ru and Rh hydrogenation catalysts were assembled over the SHINs by wet impregnation of aqueous RuCl and RhCl . The substrates were implemented to study CO adsorption and hydrogenation under in situ conditions at various temperatures to illustrate the differences between catalysts and shell materials with SHINERS. This work demonstrates the potential of SHINS for in situ characterization studies in a wide range of catalytic reactions.
拉曼光谱法是一种用于固体催化剂表征的强大技术，因为它能提供（金属）氧化物、反应物和产物的振动指纹图谱。通过实施壳层隔离表面增强拉曼光谱法（SHINERS），它甚至可以成为一种强大的表面敏感技术。因此，制备了各种尺寸的Au@TiO和Au@SiO壳层隔离纳米颗粒（SHINs），用于研究多相催化以及金属氧化物涂层的影响。SiO -和TiO -SHINs都是有效的SHINERS底物，并且在高达400 °C的温度下具有热稳定性。通过用RuCl和RhCl的水溶液进行湿浸渍，在SHINs上组装了纳米级的Ru和Rh加氢催化剂。这些底物用于研究在不同温度下原位条件下的CO吸附和加氢，以说明使用SHINERS时催化剂和壳层材料之间的差异。这项工作证明了SHINs在广泛的催化反应原位表征研究中的潜力。
