The possibility of application of 4-nitrocatechol (4-NC) - tetrazolium salt - organic solventsystems for liquid-liquid extraction-spectrophotometric vanadium (IV and V) speciation wasstudied. Six commercially available tetrazolium salts (2,3,5-triphenyltetrazolium chloride (TTC),3-(2-naphtyl)-2,5-diphenyltetrazolium chloride (Tetrazolium Violet, TV); 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyltetra...

Titanium oxide films were prepared from peroxotitanium complex aqueous solution containing a peroxo of vanadium, molybdenum or tungsten 2, 5, 10 mol % by heating at 200 °C for the purpose suppressing photocatalytic activities that may be developed crystallization during long-term use as prevention film against potential-induced degradation (PID) crystalline silicon (c-Si) photovoltaic (PV) modu...

We present our theoretical results on the electronic state in vanadium spinel oxide AlV2O4. The material is a mixed-valent system with the average valence V, and V cations constitute a frustrated pyrochlore structure. It shows a structural transition at ∼ 700 K, leading to the formation of seven V-sites clusters — heptamers. We study the electronic state of the heptamer by explicitly taking acc...

The phase composition of vanadium and vanadium-antimony-containing samples γ-Al2O3 the degree oxidation in them were examined by XRD EPR methods, respectively. data spectroscopy show formation highly dispersed vanadium-oxygen vanadiumantimony-oxygen structures on surface support. It is shown that spectra studied are due to "isolated" ions with an state +4 nonstoichiometric vanadium-antimony-oxy...

The chromium/vanadium bimetallic Phillips catalysts developed by our research group have been proved to be a promising process to produce bimodal polyethylene using a single-reactor process. The vanadium loading of CrV-1/1, CrV-1/2, and CrV-1/3 has a significant effect on the polymerization activity, product molecular weight (MW), as well as th...