Kinetics of nitrogen adsorption on fe 111
WebAbstract The chemisorption of dinitrogen, ammonia and hydrogen on the Fe (111) single crystal surface has been studied by low energy electron diffraction and high - and low - energy photoelectron spectroscopy. The clean surface is shown to be unreconstructed. WebIn this article, we will summarize the kinetic models for nitrogen dissociation on Fe {111} and will present new data on the adsorption mechanism for the π-bonded α-N 2 state, …
Kinetics of nitrogen adsorption on fe 111
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Web29 dec. 2024 · We present a study of stepwise cryogenic N 2 adsorption on size-selected Fe n+ ( n = 8–20) clusters within a hexapole collision cell held at T = 21–28 K. The stoichiometries of the observed adsorption limits and the kinetic fits of stepwise N 2 uptake reveal cluster size-dependent variations that characterize four structural regions. Web4 jun. 1998 · We describe thermal desorption experiments and their computer simulations together with thermodynamic equilibrium measurements for molecular nitrogen …
Web3 jan. 2024 · The oxygen surface kinetics of Sr 2 Fe 1.5 Mo 0.5 O 6−δ was determined using the 16 O 2 / 18 O 2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (r H) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18 O fraction using … Web30 dec. 2024 · Adsorption kinetic experiments were carried out using a shaker water bath. The entire dye solution was prepared with distilled water. Kinetic experiments were carried out by agitating a 50 mL solution of a constant dye concentration (100 mg/L with 0.3 g of Ca-ALG/MgO/Ag nanocomposite beads at a constant agitation speed, 30 °C, and pH of …
Web1 mrt. 1985 · Abstract The N2 dissociation on Fe (111) is investigated by calculating total-energy surfaces within a linear combination of atomic orbitals type formalism. The two molecular precursor states,... WebIn this work the adsorption capacities of methylene blue on Mg-smectite and sepiolite and its derived material obtained after acid treatment and/or the addition of Fe at its surfaces are studied. Natural smectite with high Mg-content in its octahedral sheet (Mg-smectite) displays higher adsorption capacity than the sepiolite due to the ability of Mg-smectite to expand …
WebPrecursor mediated and direct adsorption of molecular nitrogen on Fe {111} In this article, we will summarize the kinetic models for nitrogen dissociation on Fe {111} and will …
Web22 nov. 2013 · The results showed that the stepped surfaces, especially the Fe (111) surface, are more active than the terraced surfaces, which could be related to the presence of so-called C7 sites for the... low on totem pole meaningWeb13 apr. 2024 · Before adsorption energies of atomic oxygen on Fe (111) surface can be calculated, the energy of diatomic oxygen must be calculated first. A geometry optimization of diatomic oxygen in the gas phase was performed in a 15 x 15 x 15 Å vacuum cube at an energy cutoff value of 400 eV and a 1 x 1 x 1 K Point set. low on the totem pole synonymWeb2 dagen geleden · The structural features of as-synthesized catalysts were probed by powder X-ray diffraction (XRD) technique. A broad diffraction peak at about 25 o for Rh/C displayed in Fig. 1 a was assigned to the (002) plane of the carbon support. Rh/C showed the face-centered cubic (fcc) polycrystalline structure with (111) as the dominant … java get substring after characterWeb2 dagen geleden · The role of X (Ta, Ti, and W) doping in affecting the adsorption and diffusion behavior of nitrogen at Ni 3 Al(110) and Ni 3 Al(111) surfaces was studied based on first-principles calculations to understand the nitriding mechanism of γ'-Ni 3 Al in Ni-based superalloys. The calculated results show that the substituting of X atom on the 1st-layer … java get position of element in arrayWeb17 aug. 2024 · The recycling and regeneration of Fe(III) is the key point for promoting the oxidation reaction of ore to produce acidic mine drainage (AMD). Hydroxyapatite (HAP) has excellent adsorption ability of Fe(III), which has good biocompatibility and is widely distributed in nature. In order to achieve the source treatment of AMD, the migration and … low on toner/inkWeb9 feb. 2024 · The porous structure of the samples was further investigated by nitrogen adsorption–desorption measurements ().Ni@NGC exhibited a type IV hysteresis in the relative pressure region of 0.4–0.9 P / P 0 and moderately smooth adsorption curves throughout the whole relative pressure region, indicating the presence of mesopores. … java getters and setters with listsWeb13 apr. 2024 · After the adsorption of Fe (III) on PYCS at pH 2.5, the minor shift for −NH or C−N, and the obvious shift for C=N for PYCS before and after the adsorption of Fe (III) … low on the glycemic index foods