Journal ArticleDOI
Surface, catalytic and magnetic properties of small iron particles: III. Nitrogen induced surface reconstruction
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In this paper, the turnover number for ammonia synthesis was found to be smaller on very small iron particles than on larger ones, but it could be enhanced by a pretreatment which seemed to bring about a surface reconstruction induced by nitrogen.About:
This article is published in Journal of Catalysis.The article was published on 1975-06-06. It has received 169 citations till now. The article focuses on the topics: Surface reconstruction & Carbon monoxide.read more
Citations
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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
TL;DR: 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.
Journal ArticleDOI
NEXAFS investigations of transition metal oxides, nitrides, carbides, sulfides and other interstitial compounds
TL;DR: In this article, the authors review applications of the near-edge X-ray absorption fine structure (NEXAFS) technique in the investigations of electronic and structural properties of transition metal compounds.
Journal ArticleDOI
The Haber–Bosch Process Revisited: On the Real Structure and Stability of “Ammonia Iron” under Working Conditions
TL;DR: There still is a gap between the model studies conducted with well-defined simplified materials with clean surfaces at low pressures to elaborate the current knowledge of ammonia synthesis and the industrial process, and the question of a dynamical change of the catalyst under true reaction conditions remains to be studied and calls for in situ experimentation.
Journal ArticleDOI
Surface Science and Catalysis—Studies on the Mechanism of Ammonia Synthesis: The P. H. Emmett Award Address
TL;DR: In this article, it was shown that the rate-determining step in ammonia synthesis over iron catalysts is the chemisorption of nitrogen, and the question as to whether the nitrogen species involved on the surface is molecular or atomic is still not conclusively resolved.
Book ChapterDOI
The Influence of Particle Size on the Catalytic Properties of Supported Metals
Michel Che,Carroll O. Bennett +1 more
TL;DR: In this article, the authors address the question of below which particle size the metallic properties are lost and the practical ways of producing metals with particle sizes around the critical value calculated above.
References
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Mössbauer Spectroscopy
TL;DR: The Mössbauer Effect Methodology as mentioned in this paper is a well-known method for nuclear power analysis and it has been used extensively in the nuclear power research community, e.g., in the first Symposium.
Journal ArticleDOI
Anisotropie magnétique superficielle et surstructures d'orientation
TL;DR: In this article, the authors propose an energie magnetocristalline and magnetoelastique of a corps ferromagnetique comme la somme de termes elementaires relatifs chacun a liaison, c'est-a-dire a couple of deux atomes proches voisins.
Journal ArticleDOI
The Intermolecular Potentials for Some Simple Nonpolar Molecules
Edward A. Mason,William E. Rice +1 more
TL;DR: For gases whose molecules deviate appreciably from spherical symmetry, it was necessary to choose at least two different sets of potential parameters in order to reproduce different types of properties.
Journal ArticleDOI
Surface, catalytic and magnetic properties of small iron particles: I. Preparation and characterization of samples
TL;DR: Very small and stable metallic iron particles supported on magnesium oxide have been obtained in an average size d from 1.5 to 30 nm as discussed by the authors, where the hydrogen reduced particles consist of metallic iron, magnesium oxide, and Fe 2+ clusters in magnesium oxide.