Journal ArticleDOI
Atom-Resolved Imaging of Dynamic Shape Changes in Supported Copper Nanocrystals
Poul L. Hansen,Jakob Birkedal Wagner,Stig Helveg,Jens R. Rostrup-Nielsen,Bjerne S. Clausen,Henrik Topsøe +5 more
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TLDR
In situ transmission electron microscopy is used to obtain atom-resolved images of copper nanocrystals on different supports, which are catalysts for methanol synthesis and hydrocarbon conversion processes for fuel cells.Abstract:
In situ transmission electron microscopy is used to obtain atom-resolved images of copper nanocrystals on different supports. These are catalysts for methanol synthesis and hydrocarbon conversion processes for fuel cells. The nanocrystals undergo dynamic reversible shape changes in response to changes in the gaseous environment. For zinc oxide-supported samples, the changes are caused both by adsorbate-induced changes in surface energies and by changes in the interfacial energy. For copper nanocrystals supported on silica, the support has negligible influence on the structure. Nanoparticle dynamics must be included in the description of catalytic and other properties of nanomaterials. In situ microscopy offers possibilities for obtaining the relevant atomic-scale insight.read more
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Bridging the gap between insightful simplicity and successful complexity: From fundamental studies on model systems to technical catalysts
Gonzalo Prieto,Ferdi Schüth +1 more
TL;DR: Topsoe et al. as mentioned in this paper reviewed some key advancements that the Topsoe team has contributed to the field of catalyst development, rooted in fundamental studies with either 2D or 3D model materials.
Journal ArticleDOI
Dynamic Changes in LSM Nanoparticles on YSZ: A Model System for Non-Stationary SOFC Cathode Behavior
TL;DR: In this article, the interaction between strontium-doped lanthanum manganite (LSM) and single crystal yttria-stabilized zirconia (YSZ) was investigated using atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy(SEM)/energy-dispersive xray spectroscope (EDX).
Journal ArticleDOI
Effects of the preparation method on the performance of the Cu/ZnO/Al2O3 catalyst for the manufacture of L-phenylalaninol with high ee selectivity from L-phenylalanine methyl ester
TL;DR: In this paper, the effects of the preparation method on the properties of Cu/ZnO/Al2O3 catalysts for L-phenylalanine methyl ester hydrogenation to Lphenyl-alaninol were investigated in detail, including the precipitation method and conditions (the aging time, calcination temperature and so on), with the help of ICP-OES, N2 and N2O adsorption, XRD, H2-TPR and TEM techniques.
Journal ArticleDOI
Genesis of catalysts for methanol synthesis
TL;DR: The experimental data and hypotheses on the nature and structural peculiarities of the precursors and the active state of Cu-Zn-containing catalysts for methanol synthesis are considered in this paper.
References
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