2984-50-1Relevant articles and documents
Oxide-Supported Titanium Catalysts: Structure-Activity Relationship in Heterogeneous Catalysis, with the Choice of Support as a Key Step
Larabi, Cherif,Norsic, Sébastien,Khrouz, Lhoussain,Boyron, Olivier,Szeto, Kai Chung,Lucas, Christine,Taoufik, Mostafa,De Mallmann, Aimery
, p. 4608 - 4617 (2020)
The reactions of tetrakis(neopentyl)titanium, TiNp4 (1), with the surface of three solid oxides, silica, silica-alumina, and alumina, all partially dehydroxylated at 500 °C under vacuum were achieved. The resulting supported organometallic species react with dihydrogen to form the corresponding supported hydrides. The preparation of supported titanium hydrides on alumina is described here in detail, and the species obtained were extensively characterized by FTIR, solid-state NMR and EPR spectroscopy, and mass-balance analysis. The supported titanium hydride species were tested in three important reactions for petrochemistry: epoxidation of 1-octene, depolymerization of Fischer-Tropsch waxes, and polymerization of ethylene. The activities of titanium hydrides supported on alumina were compared to those of their silica- and silica-alumina-supported analogues.
Polyoxometalate-catalysed epoxidation of 1-octene with hydrogen peroxide in microemulsions coupled with ultrafiltration
Lambert, Arnold,Plucinski, Pawel,Kozhevnikov, Ivan V.
, p. 714 - 715 (2003)
Epoxidation of 1-octene with hydrogen peroxide catalysed by amphiphilic salts of peroxo tungstophosphate {PO4[WO(O2)2]4}3- in water-in-oil microemulsions is an efficient and environmentally benign reaction which, coupled with ultrafiltration, shows the potential for continuous production of epoxides.
Effect of Tetrahedral Ti in Titania-Silica Mixed Oxides on Epoxidation Activity and Lewis Acidity
Imamura, Selichiro,Nakai, Tohru,Kanai, Hiroyoshi,Ito, Tomoyasu
, p. 1261 - 1266 (1995)
The states of Ti in titania-silica mixed oxides have been studied by varying the Ti content.EXAFS analyses indicated that the amount of tetrahedral Ti species increased with a decrease in the Ti content reaching a maximum at 10 to 20 molpercent of Ti while octahedrally coordinated Ti predominated in the high Ti content region (Ti >/= 50 molpercent).Tetrahedral Ti species catalyse the epoxidation of oct-1-ene and cyclohexene using tert-butyl hydroperoxide as an oxidant.Lewis acid sites of the titania-silica also originated from the tetrahedral Ti species.Both epoxidation activity and Lewis acidity of the titania-silica were well explained by the coordinative unsaturation of the tetrahedral Ti site.
Green solvent free epoxidation of olefins by a heterogenised hydrazone-dioxidotungsten(vi) coordination compound
Bikas, Rahman,Heydari, Neda,Lis, Tadeusz,Shaterian, Maryam
, p. 4813 - 4827 (2022/02/19)
A new mononuclear tungsten coordination compound, [WO2L(CH3OH)] (1), was synthesized by the reaction of WCl6 and H2L (H2L = (E)-4-amino-N′-(5-bromo-2-hydroxybenzylidene)benzohydrazide) in methanol. Bo
Efficient and selective oxidation of hydrocarbons with tert-butyl hydroperoxide catalyzed by oxidovanadium(IV) unsymmetrical Schiff base complex supported on γ-Fe2O3 magnetic nanoparticles
Samani, Mahnaz,Ardakani, Mehdi Hatefi,Sabet, Mohammad
, p. 1481 - 1494 (2022/01/22)
The catalytic activity of an oxidovanadium(IV) unsymmetrical Schiff base complex supported on γ-Fe2O3 magnetic nanoparticles, γ-Fe2O3@[VO(salenac-OH)] in which salenac-OH = [9-(2′,4′-dihydroxyphenyl)-5,8-diaza-4