Journal ArticleDOI
Heats of Chemisorption of O2, H2, CO, CO2, and N2 on Polycrystalline and Single Crystal Transition Metal Surfaces
I. Toyoshima,Gabor A. Somorjai +1 more
TLDR
In this paper, the authors defined the heat of adsorption as the energy needed to break the MX2 bond and defined ΔHads as the amount of energy required to do so.Abstract:
One of the important physical-chemical properties that characterizes the interaction of solid surfaces with gases is the bond energy of the adsorbed species. The determination of the bond energy is usually performed indirectly by measuring the heat of adsorption (or heat of desorption) of the gas [1, 2], In order to define the heat of adsorption, let us consider the chemisorption of a diatomic molecule, X2, onto a site on a uniform solid surface, M. The molecule may adsorb without dissociation to form MX2. M represents the adsorption site where bonding occurs to a cluster of atoms or to a single atom. In this circumstance, the heat of adsorption, ΔHads, is defined as the energy needed to break the MX2 bond:read more
Citations
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Book ChapterDOI
Theoretical surface science and catalysis—calculations and concepts
Bjørk Hammer,Jens K. Nørskov +1 more
TL;DR: The application of density functional theory to calculate adsorption properties, reaction pathways, and activation energies for surface chemical reactions is reviewed in this article, with particular emphasis on developing concepts that can be used to understand and predict variations in reactivity from one transition metal to the next or the effects of alloying, surface structure, and adsorbate-adsorbate interactions on the reactivity.
Journal ArticleDOI
The interaction of water with solid surfaces: Fundamental aspects
TL;DR: In this paper, the authors compare and discuss recent experimental and theoretical results in the field of H2O-solid interactions, and emphasize studies of low (submonolayer) coverages of water on well-characterized, single-crystal surfaces of metals, semiconductors and oxides.
Journal ArticleDOI
Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides
Sébastien Royer,Daniel Duprez +1 more
TL;DR: In this article, the kinetics and mechanism of CO oxidation on single and mixed oxides are examined, alongside the catalyst structures, in a review of the literature on carbon monoxide over oxide catalysts.
Journal ArticleDOI
Water-gas shift reaction: finding the mechanistic boundary
TL;DR: The mechanism of the water-gas shift reaction for both copper/zinc oxide/alumina and iron oxide/chromium oxide catalysts was discussed in this article, where the associative and regenerative mechanisms were presented and the evidence concerning each mechanism was critically reviewed.
Journal ArticleDOI
Enhanced Electrochemical Methanation of Carbon Dioxide with a Dispersible Nanoscale Copper Catalyst
TL;DR: It is demonstrated that copper nanoparticles supported on glassy carbon (n-Cu/C) achieve up to 4 times greater methanation current densities compared to high-purity copper foil electrodes, which represents a first step toward the preparation of practical meethanation catalysts that can be incorporated into membrane-electrode assemblies in electrolyzers.
References
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Journal ArticleDOI
Thermal desorption of gases
TL;DR: In this paper, the activation energy, rate constant and order of reaction from flash-filament desorption experiments were examined, and two heating schedules were considered: a linear variation of sample temperature with time (T = T 0+st), and a reciprocal temperature variation (1 T = 1 T 0 −αt).
Book
Comprehensive inorganic chemistry
TL;DR: In this article, the transition elements involving metal-metal bonds are defined and an introductory essay is given, along with a discussion of homogeneous catalysis and transition metal chemistry, B L Shaw & N I Tucker.