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
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Single Molecule Electrochemistry: Impact of Surface Site Heterogeneity.
TL;DR: In this article, the binding energy of R6G+ adsorbed on a silver nanoparticle (AgNP) was derived theoretically from the reduction potential of the dye molecule and the periodic density functional theory was used to calculate this energy at different local surface sites.
Journal ArticleDOI
CHD3 Dissociation on the Kinked Pt(210) Surface : A Comparison of Experiment and Theory
TL;DR: In this paper, a semi-empirical specific reaction parameter (SRP) density functional developed to describe CHD3-dissociation on a flat Ni(111) surface is transferable to describing the same reaction on a stepped Pt(211) surface.
Journal ArticleDOI
An Atomic Scale View of Methanol Reactivity at the Cu(1 1 1)/CuOx Interface
TL;DR: The reactivity of coinage metal surfaces, especially Cu and Au, toward methanol (MeOH) attracts substantial research interest as discussed by the authors, in part due to the wide range of applications that involve heterogeneously catalyzed molecular transformations of MeOH, most of which are critical to the energy and chemical industries.
Journal ArticleDOI
Low-pressure methanol oxidation over a Cu(110) surface under stationary conditions : (I) reaction kinetics
TL;DR: In this article, the steady-state kinetics of methanol oxidation over Cu(110) have been studied in the 10 −7 to 10 −3 mbar range.
Journal ArticleDOI
Embryonic zeolites for highly efficient synthesis of dimethyl ether from syngas
Ana Palčić,Sara Navarro Jaén,Dan Wu,Mengdie Cai,Chong Liu,Evgeny A. Pidko,Andrei Y. Khodakov,Vitaly V. Ordomsky,Valentin Valtchev +8 more
TL;DR: In this article, the effect of embryonic zeolite on the DME synthesis has been assigned to enhanced transport of methanol from Cu to ultra-small ZSM-5 units with moderate acidity, hence promoting the efficient dehydration to DME with high selectivity and stability.
References
More filters
Journal ArticleDOI
Controlled growth of monodisperse silica spheres in the micron size range
TL;DR: In this article, a system of chemical reactions has been developed which permits the controlled growth of spherical silica particles of uniform size by means of hydrolysis of alkyl silicates and subsequent condensation of silicic acid in alcoholic solutions.
Journal ArticleDOI
Semiconductor Clusters, Nanocrystals, and Quantum Dots
TL;DR: In this article, the authors focus on the properties of quantum dots and their ability to join the dots into complex assemblies creates many opportunities for scientific discovery, such as the ability of joining the dots to complex assemblies.
Reference BookDOI
Handbook of Heterogeneous Catalysis
TL;DR: This paper presents a meta-modelling system that automates the very labor-intensive and therefore time-heavy and therefore expensive and expensive process of characterization and activation of Solid Catalysts.
Journal ArticleDOI
Photoinduced conversion of silver nanospheres to nanoprisms.
TL;DR: This light-driven process results in a colloid with distinctive optical properties that directly relate to the nanoprism shape of the particles, which could be useful in developing multicolor diagnostic labels on the basis of nanoparticle composition and size but also of shape.
Journal ArticleDOI
Some interesting properties of metals confined in time and nanometer space of different shapes.
TL;DR: Some of the observed new chemical, optical, and thermal properties of metallic nanocrystals when their size is confined to the nanometer length scale and their dynamical processes are observed on the femto- to picosecond time scale are described.