Pyrochlore Type Tungsten Oxide Application (A)

Different chain length alkyl amine embedded in the body of the layered inorganic microporous pillared material can be obtained, having a high specific surface area, porous structure with a pore size is adjustable, which research in the field of catalysis is important, but also in the adsorption, conduction, separation and catalysis and many other fields have broad application prospects. The several monohydric alkylamine (CnH2n + 1NH2, n = 4,8,12,16) embedded in a layered H2W2O7 behavior, they will H2W2O7 placed alkyl amine with a mixture of n-heptane, at room temperature 7d after reaction by washing, drying, to obtain a variety of layered composites. Alkylamine between the middle and the composite layer is formed by electrostatic attraction interaction, all-trans conformation bilayered arrangements, the layer spacing carbon atoms with alkylamines genus increases linearly. Bandgap semiconductor composite tungsten oxide is relatively much larger. Later they HTT as intermediates, but also indirectly by cation exchange mechanism of aniline cation H2W2O7 embedded between layers. Polyaniline molecules do not destroy the original laminate structure between the layers into a single vertical distribution. Comparative decomposition temperature H2W2O7 and alkylamine / H2W27 composite, polyaniline embedded greatly improved thermal stability of the material. Use H2W2O7 and n-octylamine was synthesized intercalation compound in a non-polar medium, heptane, after removal of the organic amine, the final calcination step to obtain a functional material, the material exhibits a very high sensitivity to alcohol. Also use H2W2O7 • xH2O with heptane / octane mixed solution reaction, between the release of the layer of water hydrolysis reaction with octylamine highly alkaline aqueous solution to form microdomains, [W2O7] bilayer is dissolved in an alkaline solution is high [WO4 ] monolayer, such as formula (7) below. Generation of H2-b (RNH3) WO4 quasi reverse micelles medium for highly ordered self-assembled inorganic - organic hybrid nanoribbons (C8NH2-HWO), the nano-dispersed in an aqueous solution with nitric acid, by magnetic stirring, the solid-liquid separation, washing, WO3 nanosheets after heat treatment, and the morphology, structure and formation mechanism of the product discussed. Later, after a series of studies, they will intercalation reaction of specific conditions were appropriate adjustments, the final establishment of the use H2W2O7 • xH2O preparation intercalation composites and nano-WO3 better process and noted that the method is suitable for large-scale WO3 nano production, low cost and meet the requirements of industrialization. H2W2O7 • xH2O + aRNH2H2-a (RNH3) W2O7 + xH2O (6) H2-a (RNH3) aW2O7 + (2b-a) RNH2 + H2O2H2-b (RNH3) bWO4 (7).

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