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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 article, the activation energy for desorption of this oxygen state was estimated from the thermal de-noising spectra to be about 163 kJ mol−1, and the chemisorbed oxygen atoms and the oxygen associated with silicon were distinguished by different binding energies (529.2 and 532.3 eV respectively).

181 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the paradigm of ion exchange systems involving zeolites and cations as a case study, and all basic theoretical issues are presented, analyzed and discussed with the support of a large number of experimental data in order to draw secure conclusions on several critical issues.
Abstract: The heat of adsorption, the adsorption energy and the activation energy are of the most important and frequently calculated parameters in adsorption and ion exchange systems. However, in many occasions these parameters are not clearly defined, appropriate calculated or analyzed in the related literature. A characteristic example is the use of different limits used in order to identify a process as physisorption, chemisorption or ion exchange. The present paper aims at clarifying the nature of these parameters and their interrelationship in theoretical basis and to present the paradigm of ion exchange systems involving zeolites and cations as a case study. All basic theoretical issues are presented, analyzed and discussed with the support of a large number of experimental data in order to draw secure conclusions on several critical issues. In total 46 activation energy, 32 adsorption energy and 34 heat of adsorption experimental values are collected and discussed.

180 citations

Journal ArticleDOI
TL;DR: Li et al. as discussed by the authors demonstrated that carbon vacancy-modified nanosheet structure g-C 3 N 4 (Ns-g-C3 N 4 ) can efficiently and selectively reduce NO to N 2 under visible light.
Abstract: Photocatalytic oxidation has recently been recognized as an attractive technology for NO removal, in which the main products are NO 2 or HNO 3 . However, these products may cause secondary pollution and deactivation of the involved photocatalysts. In this study, we demonstrate that carbon vacancy-modified nanosheet structure g-C 3 N 4 (Ns-g-C 3 N 4 ) can efficiently and selectively reduce NO to N 2 under visible light. Since N 2 is a green gas and can easily desorb from the active sites, the problems such as secondary pollution and catalyst deactivation are largely avoided. It was found that two structural characters of Ns-g-C 3 N 4 , ultrathin nanostructure and abundant surface defect sites, could promote its visible light absorption, and favor the separation and transfer of photogenerated charge carriers as well as strong chemisorption of NO, leading to high photoreactivity. Meanwhile, the surface defects of Ns-g-C 3 N 4 shift the adsorption structure of NO from C N O for the bulk counterpart to Cv O N (adsorbed at the carbon vacancy site, Cv), eventually resulting in its high selectivity of converting NO to N 2 . The present study underlines the impetus of utilizing surface defect structure to regulate photocatalytic reaction pathway.

180 citations

Journal ArticleDOI
TL;DR: In this article, the semi-empirical MO method SINDO1 was used for the investigation of molecular and dissociative adsorption of water at titanium dioxide surfaces rutile (110) and anatase (001).

180 citations

Journal ArticleDOI
TL;DR: In this article, an extensive experimental program was designed to understand the surface poisoning of metal hydrides by impurities in the hydrogen used, and the results showed the hope of developing surface structures with significant resistance to impurity gases and especially the possibility of designing practical regeneration cycles.
Abstract: This paper is a brief summary of an extensive experimental program designed to understand the surface poisoning of metal hydrides by impurities in the hydrogen used. The alloys investigated were LaNi5, FeTi and Fe0.85Mn0.15Ti. The gaseous impurities studied were O2, H2O and CO. The nature of the surface structures formed and consequently the degree of poisoning and ease of reactivation vary markedly from alloy to alloy and from impurity to impurity. Examples of complex compound film formation, chemisorption and possibly physisorption can be seen. The results show the hope of developing surface structures with significant resistance to impurity gases and especially the possibility of designing practical regeneration cycles.

180 citations


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