High resolution solid state NMRspectroscopy in surface organometallic chemistry: access to molecular understanding of active sites of well-defined heterogeneous catalysts

2008 ◽  
Vol 37 (3) ◽  
pp. 518-526 ◽  
Author(s):  
Frédéric Blanc ◽  
Christophe Copéret ◽  
Anne Lesage ◽  
Lyndon Emsley
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Organometallic Chemistry ◽  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Surface Organometallic Chemistry

scholarly journals Reflections on the value of electron microscopy in the study of heterogeneous catalysts

2017 ◽  
Vol 473 (2197) ◽  
pp. 20160714 ◽  
Author(s):  
John Meurig Thomas
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Three Dimensions ◽  
Single Atom ◽  
Catalyst Characterization ◽  
Solid Catalysts ◽  
Valence States ◽  
Ac Transmission

Electron microscopy (EM) is arguably the single most powerful method of characterizing heterogeneous catalysts. Irrespective of whether they are bulk and multiphasic, or monophasic and monocrystalline, or nanocluster and even single-atom and on a support, their structures in atomic detail can be visualized in two or three dimensions, thanks to high-resolution instruments, with sub-Ångstrom spatial resolutions. Their topography, tomography, phase-purity, composition, as well as the bonding, and valence-states of their constituent atoms and ions and, in favourable circumstances, the short-range and long-range atomic order and dynamics of the catalytically active sites, can all be retrieved by the panoply of variants of modern EM. The latter embrace electron crystallography, rotation and precession electron diffraction, X-ray emission and high-resolution electron energy-loss spectra (EELS). Aberration-corrected (AC) transmission (TEM) and scanning transmission electron microscopy (STEM) have led to a revolution in structure determination. Environmental EM is already playing an increasing role in catalyst characterization, and new advances, involving special cells for the study of solid catalysts in contact with liquid reactants, have recently been deployed.

scholarly journals Heterogeneous alkane dehydrogenation catalysts investigated via a surface organometallic chemistry approach

2021 ◽  
Author(s):  
Scott R. Docherty ◽  
Lukas Rochlitz ◽  
Pierre-Adrien Payard ◽  
Christophe Copéret
Keyword(s):  
Organometallic Chemistry ◽  
Heterogeneous Catalysts ◽  
Alkane Dehydrogenation ◽  
Classical Systems ◽  
Pt Alloys ◽  
Surface Organometallic Chemistry

Alkane dehydrogenation over heterogeneous catalysts has attracted renewed attention in recent years. Here, well-defined catalysts based on isolated metal sites and supported Pt-alloys prepared via SOMC are discussed and compared to classical systems.

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