Oxophilic sites
Oxophilicity is the tendency of certain chemical compounds to form oxides by hydrolysis or abstraction of an oxygen atom from another molecule, often from organic compounds. The term is often used to describe metal centers, commonly the early transition metals such as titanium, niobium, and tungsten. … See more Complexes of oxophilic metals typically are prone to hydrolysis. For example, the high valent chlorides hydrolyze rapidly to give oxides: TiCl4 + 2 H2O → TiO2 + 4 HCl These reactions … See more Oxophilic reagents are often used to extract or exchange oxygen centers in organic substrates, especially carbonyls (esters, ketones, amides) and epoxides. The highly oxophilic reagent generated from tungsten hexachloride and butyl lithium is … See more WebMar 20, 2013 · They build a case for this basic idea by showing that materials that incorporate highly oxophilic sites (which offer a stronger interaction with OH ad) show an …
Oxophilic sites
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WebSep 13, 2024 · Periodic density functional theory analysis indicates a stronger interaction between the carbonyl group of acetophenone with Co than with Pt sites of the mono and bimetallic systems, indicating a key activity of oxophilic sites towards improved selectivity to deoxygenated products. WebAug 31, 2016 · Oxophilicity and thiophilicity are widely used concepts with no quantitative definition. In this paper, a simple, generic scale is developed that solves issues with …
WebNov 1, 2024 · Oxophilicity is a direct function of the position of the d -band center with respect to the Fermi level. Therefore, it can be adjusted, not only by changing the type of metal used, but also by varying the coordination number of metal atoms [28, 29, 30, 31, 32]. WebAug 27, 2024 · To elucidate the role of surface oxophilicity, a series of nonprecious copper-based bimetallic materials were systematically studied for HER activity in alkaline conditions. By alloying copper with small amounts of oxophilic transition metals such as Ti, Co, or Ni, a significant enhancement in HER activity was achieved in comparison to pure …
WebFeb 24, 2013 · We propose that the more oxophilic sites on Ir (defects) and PtRu material (Ru atoms) electrodes facilitate the adsorption of OH ad species. Those then react with the hydrogen intermediates (H... Webbetween the O of the carbonyl group and the oxophilic site. It is proposed that the oxophilicity of these catalysts is related to the structure of the CexZr1-xO2 solid solution formed. In addition, it is observed that the degree of deactivation during the reaction also depends on the Ce/Zr molar ratio of the support. Pd/ZrO2,
WebMar 1, 2024 · Over a series of Pd/Ce x Zr x-1 O 2 catalysts, it was observed that with the introduction of ZrO 2 (which contains oxophilic Zr 3+ /Zr 4+ sites) into the support, the selectivity toward ...
WebFeb 24, 2024 · In addition to the metals, the oxophilic sites of this support represented by Zr 4+ and Zr 3+ cations near the perimeter of the metal particles also increased the selectivity to deoxygenated products. All catalysts were significantly deactivated mainly owing to the growth of metal particle size and the decrease in the density of oxophilic sites. link publications myncbi to rpprWebDensity functional theory (DFT) calculations and experimental results reveal that the Cr atoms not only act as oxophilic sites for boosting water adsorption and dissociation, but also modulate the electronic structure of Co 4 N to endow optimized hydrogen binding abilities on Co atoms, thereby leading to accelerating both the alkaline Volmer ... link pubg xbox to pcWebAug 31, 2016 · Significantly, enhanced CH4 selectivity can be achieved by doping oxophilic La³⁺ ions into a broad range of alternative photocatalysts including ZnO, SnS2, BiOBr, BiVO4, TaON, and CsPbBr3 ... link public schools mnWebFeb 24, 2024 · In addition to the metals, the oxophilic sites of this support represented by Zr 4+ and Zr 3+ cations near the perimeter of the metal particles also increased the … link publishing bristolWebFeb 20, 2024 · The selective enhancement of j could be due to the stabilization of the *CHO intermediate at bimetallic sites, where Ag acts as an active site for CO 2 reduction and Zn acts as an oxophilic site that helps to stabilize the *CHO intermediate in more of a bidentate configuration, as in a concept described previously. 11 Stabilization of the *CHO ... link pulling the master sword outWebJul 15, 2024 · It is proposed that the oxophilicity of these catalysts is related to the structure of the Ce x Zr 1-x O 2 solid solution formed. In addition, it is observed that the degree of deactivation during the reaction also depends on the Ce/Zr molar ratio of the support. hour in halifaxWebNickel-based alloys have been recognized as promising catalysts for upgrading of bio-oils because of their superior deoxygenation activity. Herein, we present a density-functional … link pull request to issue github