7727-18-6Relevant articles and documents
Briscoe, H. V. A.,Little, E. F. V.
, p. 1310 - 1334 (1914)
Direct synthesis of dimethyl carbonate from carbon dioxide and methanol using supported copper (Ni, V, O) catalyst with photo-assistance
Wang,Xiao,Wang,Lu,Meng
, p. 92 - 96 (2007)
The photo-catalytic effect of a copper modified (Ni, V, O) semiconductor complex catalyst on the direct synthesis of dimethyl carbonate (DMC) from CO2 and CH3OH was investigated. The synthesized catalysts were fully characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD), Ultraviolet visible drift reflection spectra (UV-vis DRS) and transmission electron microscopy (TEM). The nano-scale catalyst particles were observed with TEM and light absorbance was then predicted by UV-vis DRS spectra. The pressure and temperature dependencies of the photo-catalytic activity were studied. The results demonstrated that the catalytic activity was enhanced with the assistance of ultraviolet (UV) irradiation compared with the pure thermal and surface catalytic reaction under the same reaction conditions.
Gutmann, V.,Aftalion-Hinl, S.
, (1953)
Decomposition of dichlorodifluoromethane with simultaneous halogen fixation by vanadium oxide supported on magnesium oxide
Tamai, Tsukasa,Inazu, Koji,Aika, Ken-Ichi
, p. 1565 - 1574 (2007/10/03)
Dichlorodifluoromethane (CCl2F2, 1% in He) decomposition with simultaneous halogen fixation by vanadium oxide supported on magnesium oxide was studied at 723 K in a flow apparatus. The pretreatment condition and vanadium loading of supported vanadium oxide samples affected the CCl2F2 decomposition efficiency. Through characterization studies (XRD, IR, Raman, and XPS) and reference experiments, Mg 3(VO4)2 was revealed to be the active species to initiate CCl2F2 decomposition, leading to MgF 2, MgCl2, and CO2 formation. The model experiments also suggested a detailed mechanism that VOCl3 was formed from Mg3(VO4)2 by a reaction with CCl 2F2 or the major intermediate compound CCl4, and that VOCl3 reacted with MgO to regenerate Mg3(VO 4)2 and to promote chlorine fixation as MgCl2.
Decomposition of CCl3F over vanadium oxides and [MgV xOy]MgO shell/core-like particles
Martyanov, Igor N.,Klabunde, Kenneth J.
, p. 340 - 346 (2008/10/09)
Decomposition of gaseous CCl3F over in-house-prepared V 2O3 (HP-V2O3), commercial V 2O3, VO2, V2O5, a mechanical mixture of the HP-V2O3/Aerogel-prepared MgO (AP-MgO), and [MgVxOy]MgO shell/core-like particles at 280°C has been investigated with FTIR spectroscopy. The reaction of CCl 3F with the HP-V2O3 proceeds vigorously. Intermediate compounds including CCl4, CCl2F2, CCl2O, and final gaseous products CClF3, CO2 were detected. No chloride/fluoride was found on the sample surface, suggesting the formation of volatile vanadium-halogen products as well. Vanadium-chloride product was found to react with the surface of the bare AP-MgO leading to deposition of vanadium-chloride species. Activities of VO2 and V 2O3 were found to be qualitatively similar to the HP-V2O3. The reaction of CCl3F with V 2O5 proceeds much slower, with only CCl2O and CO2 gaseous products observed. Activation of the AP-MgO with vanadium-containing species leads to formation of [MgVxO y]MgO shell/core-like particles. The MgO crystalline phase was the only one detected in the [MgVxOy]MgO samples. In the reaction with CCl3F, the [MgVxOy]MgO samples retain some properties characteristic for the bare AP-MgO (presence of an induction period for V/Mg=1 mol%, lower activity toward CCl4 than toward CCl2F2 for V/Mg=1, 10 mol%), and some properties characteristic for the HP-V2O3/AP-MgO mechanical mixture (accumulation of chlorine but no fluorine on the [MgVxO y]MgO, V/Mg=10 mol% sample surface).
