Hierarchical macro-mesoporous silica materials co-incorporated with Cr and Ti 12 (MM-Si-Cr-Ti) were directly synthesized by adopting close-packed array of polystyrene 13 microsphere as hard template for macropore through a simple soaking-calcination way, where 14 the Si/Ti ratio was fixed at 200 and Si/Cr ratio varied from 200-10. Ti specie is highly dispersed 15 in the porous matrix and Cr spe...

Complexes [CrO2 (C8H5O4) (H2O) 3] and [CrO2 (C8H5O4) (H2O) 3] .H2O were prepared by reduction of CrO3 at room temperature by ethanol in the presence of phthalic acid (H2pht) yield solution that contains monomeric and dimeric Cr (III) complexes. A solution H2pht/Cr molar ratio of 1:1 and 1:2 is indefinitely stable towards precipitation. Their analysis were done by using elemental (C and H), ICP-...

The thick films of Tungsten Oxide (WO3) were prepared by screen-printing technique. Gas-sensing performance of these films was tested for various gases. The pure films showed response to Hydrogen Sulphide, Ethanol, Oxygen, and Cigar smoke. The pure WO3 thick films were surface modified by dipping them into an aqueous solution of CrO3 for different intervals of time. Surface modification improve...

severe drawbacks, mainly their toxicity and the production of large amount of waste. In addition, sodium periodate is not effective in nonpolar solvents due to its insolubility, and it is also able to oxidize other functional groups such as alcohols, alkenes, aromatics, sulphides,.. whereas its reactions with ditertiary 25 glycols do not proceed. Several other oxidizing systems have been develo...

a mild, efficient and fast method for the oxidation of alcohols and trimethylsilyl and tetrahydropyranyl ethers to their corresponding carbonyl compounds using cro3 in the presence of sulfonic acid functionalized ordered nanoporous na+-montmorillonite (sanm) and under solvent-free conditions is reported. all reactions were performed at room temperature in high to excellent yields. ease of the p...

Steelmaking slags are reused for civil engineering and roadbed materials. When the slag containing Cr oxide is reused, there a slight case of toxic Cr6+ elution from mineral phase CrO3 into environment. Therefore, in order to effectively utilize as resources, development technology suppress urgently required. Regarding formation at high temperature Cr3+, many researches have been carried out fu...

The pyrolysis of hazelnut shell, polyethylene oxide and their blends were carried out catalytically at 500 and 650 oC. Potassium dichromate was chosen according to its oxidative characteristics and decomposition temperature (500 oC) where decomposition products are CrO3 and K2CrO4. As a main effect, a remarkable increase in gasification was observed using this catalyst for pure components and b...