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Chemisorption

About: Chemisorption is a research topic. Over the lifetime, 16298 publications have been published within this topic receiving 554989 citations.


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Journal ArticleDOI
TL;DR: In this paper, the interaction of oxygen with Ag(111) has been studied over the pressure range 10 −2 −1.0 Torr, and the maximum dioxygen population is found to be markedly sensitive to gas dosing pressure; a model is proposed which accounts for these observations and for related observations on alkali-doped Ag.

150 citations

Journal ArticleDOI
TL;DR: The SAC and the regenerated SAC after five adsorption-regeneration cycles (RSAC-5th) were fully characterized by several techniques and showed that the SAC surface is composed by oxygen containing-groups, whilst the RSAC- 5th also presents nitrogen ones, provenient from the PCT molecules.

150 citations

Journal ArticleDOI
TL;DR: In this article, an active site consisting of coordinatively unsaturated cupric (Cu2+) ions in a square planar configuration is proposed to chemisorb NO molecules in the gem-dinitrosyl form.
Abstract: Cu-ZSM-5, a copper-containing zeolite, catalytically decomposes NO at temperatures below those of other catalysts. A mechanism is proposed which is based on active sites consisting of coordinatively unsaturated cupric (Cu2+) ions in a square planar configuration. These sites are posited to chemisorb NO molecules in the gem-dinitrosyl form. The pair of adsorbed NO molecules desorbs as N2 and O2. This mechanism accounts for the experimental behavior in chemisorption and decomposition without invoking a cyclical oxyreduction of the surface sites.

150 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of K2O loading on the acid sites of the V2O5(WO3)/TiO2 catalyst and its relation to the selective reduction of NO with NH3.
Abstract: To elucidate the nature of the acid sites of the V2O5(WO3)/TiO2 catalyst upon K2O addition and its relation to the selective reduction of NO with NH3, measurements were made by means of infrared and Raman spectroscopy, NH3 chemisorption, and NO reduction measurements as a function of the K2O loading. The catalytic activity was found to decrease rapidly with the K2O loading, irrespective of the similar textural properties of all samples. Addition of K2O modified the vanadium species on the catalyst surface. For large additions of K2O, the potassium partially reacted with V2O5 to form KVO3. The amount of NH3 chemisorbed on the catalyst was observed to decrease with both the loading of K2O and the temperature. The adsorption of NH3 on both Bronsted and Lewis acid sites was confirmed. The strength and the number of Bronsted acid sites decrease largely with the loading of K2O in parallel with the decrease of the SCR activity, suggesting that the SCR reaction involves NH3 adsorption on the Bronsted acid sires. At low surface coverage of NH3, the isosteric heat of NH3 chemisorption was determined to be 370 kJ/mol for 0 wt.% K2O addition. With increasing K2O amount, the heat of adsorption decreased and was 150 kJ/mol for the catalyst with higher amounts of K2O addition. The results obtained imply that potassium disturbs the formation of the active ammonia intermediates, NH4+, resulting in deactivation of the catalyst. (C) 1999 Elsevier Science B.V. All rights reserved.

149 citations

Journal ArticleDOI
TL;DR: In this paper, the Mossbauer effect, kinetics, and magnetic studies have been combined to characterize iron on V3G, a low surface area graphitic carbon, and on Carbolac-1, a porous, high surface area carbon black.

149 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023567
20221,044
2021538
2020424
2019458
2018350