This study utilizes X-ray Absorption Near Edge Structure spectroscopy to investigate the Cu oxidation state in hydrous mafic silicate melts equilibrated under diverse fO2 ( 1.8 to 3.1 log units relative to the Fayalite–Magnetite–Quartz buffer), temperature (1150–1300 °C), and pressure (1.0–...
The zeolite Cu(I)Y is promising for adsorptive removal of thiophenic sulfur compounds from transportation fuels. However, its application is seriously hindered by the instability of Cu(I), which is easily oxidized to Cu(II) even under atmospheric environ
Using X-ray absorption spectroscopy (XAS) at the Cu L(2,3) and Co L(2,3) edges, we demonstrate that the valence state of copper in the thiospinel carrollite (CuCo(2)S(4)) is Cu(+) with a d count of Cu d(9.8). The Co has a d count of d(6.4), so that the highly cova...
Variations in the oxidation state of copper during CO catalytic oxidation over powdered CuO and Cu 2 O in a gas mixture of 5% CO/He and air (O 2 ) were investigated by means of an appropriate combination of evolved gas analysis, thermogravimetry, XRD, and FT-IR in the temperature range ...
The oxidation state of Cu in Cu-ZSM-5 has been investigated by the X-ray absorption near-edge structure (XANES) spectroscopic method during NO decompositio... DJ Liu,HJ Robota - 《Catalysis Letters》 被引量: 235发表: 1993年 In situ characterization of Cu-ZSM-5 by X-ray absorption spectr...
The average oxidation state of the 1 Cu atom in Cu(CN) is +1. ElementOxidation Number (Avg)AtomsCountElectronegativity C+2+2 (×1)12.6 N-3-3 (×1)13.0 Cu+1+1 (×1)11.9 🛠️ Calculate Oxidation Numbers Instructions Enter the formula of a chemical compound to find the oxidation nu...
P. (2015). The oxidation state, and sulfur and Cu contents of arc magmas: implications for metallogeny. Lithos 233, 27-45. doi: 10.1016/j.lithos.2014.12.011Richards, J. P. (2015). The oxidation state, and sulfur and Cu contents of arc magmas: implications for metallogeny. Lithos 233,...
This value is significantly lower than the one (~ 3.64) expected on the basis of the value determined for the Na to Co stoichiometry ratio, x. The "lower-than-expected" value for the Co oxidation state may be alternatively explained by presence of oxygen vacancies or excess protons. More...
Given that the step edge is vulnerable to oxidation because surface steps act as the dominant source of Cu adatoms for oxide growth on surface terraces2,11, oxidation resistance requires that surface step edges are avoided6,12,13. In this regard, the close-packed Cu(111) surface is superior...
To determine the changes in the chemical state of the CuNPs upon exposure to air, XPS core level Cu 2p3/2spectra and Cu LMM Auger spectra of MPA-capped CuNPs (9) were collected after 0, 16 h and 5 days of air exposure (Fig.5and Supplementary Fig.13). The narrow peak at 932.0...