Nanoparticles

Synthesis of Supported Planar Iron Oxide Nanoparticles and Their Chemo- and Stereoselectivity for Hydrogenation of Alkynes

“…The fraction of rutile phase on the TiO 2 crystallites is nearly negligible (Figure S7 in the Supporting Information). Unfortunately, the presence of Fe crystalline phases for the 0.5 and 1.0 wt % Fe-TiO 2 materials was not detected with this technique, even when they were recorded at higher magnifications, since no double-diffraction Moire-like contrasts were found . In contrast, when the high-loaded 7.0 wt % n FeOx-TiO 2 catalyst was analyzed, the presence of very small FeOx NPs could clearly be observed (Figure middle center; see also Figure S8 in the Supporting Information).…”

Electron Microscopy of Solid Catalysts—Transforming from a Challenge to a Toolbox

“…Aberration-corrected (S)TEM is now capable of imaging the adsorbents and the possible structure modification at the atomic level; its interpretation needs, however, image simulation and support of DFT calculations. 144 Information Similar to That from Synchrotron Radiation. Synchrotron radiation-based methods are able to explore the fine chemical and structural variation within solid catalysts, also under reaction conditions.…”

“…The active sites of heterogeneous catalysts are often single atoms, clusters, or steps, kinks, or defects on particles. , The high resolution TEM/STEM with aberration corrector can be used to identify the active sites on the extended surface of solid catalyst and their role in reactions. ,,, …”

“…This can modify the surface structure, composition, or even morphology of catalysts and thus affect the catalytic performance. Aberration-corrected (S)­TEM is now capable of imaging the adsorbents and the possible structure modification at the atomic level; its interpretation needs, however, image simulation and support of DFT calculations …”