نتایج جستجو برای: keggin type structure
تعداد نتایج: 2715186 فیلتر نتایج به سال:
A new polyoxometalate(POM)-templated inorganic-organic hybrid compound, [Ag6(trz)6][PMo12O40]2 · 6H2O (1) (trz = 1,2,4-triazole) has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectroscopy, thermogravimetric analysis and cyclic voltammetry. In compound 1, six Ag+ ions are linked by six trz molecules to give a hexanuc...
The catalytic air oxidation-trimerization of alcohols was carried out with hetropolyacids. In the presence of hetropolyacid formation of cyclotrimers of alcohols and aldol condensation products ...
investigating the feasibility of a proposed model for geometric design of deployable arch structures
deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
New mixed H4[SiMonWn-12O40] (n = 6 and 9) Keggin type heteropolyacids (HPAs) have been successfully synthesized, as confirmed by single-crystal XRD, Raman IR spectroscopy analysis. The resulting polyoxometallates were used for preparation of hydrotreatment catalysts. Mo(W)/Al2O3 catalysts synthesized incipient wetness impregnation alumina support with water solutions prepared HPAs corresponding...
transition-metal-substituted (tms) polyoxometalates of the general formula [siw9m3o39], (where m = first row transition metal), has been synthesized and supported on anatase by sol–gel method under oil-bath condition. the tetrabutylammonium (tba) salts of the keggin-type polyoxotungstates [siw9m3o39], (m = vii, crii, mnii, feii coii and niii), proved to be green, reusable, and ...
A series of KxH1.1-xCu0.2Cs1(NH4)1.5PVMo11O40 (KxCuCsNH4PVA) catalysts with different x values were synthesized to catalyze the selective oxidation methacrolein (MAL) methacrylic acid (MAA). The effects potassium (K) ions on both structure and catalytic activity studied in detail. optimum K0.6CuCsNH4PVA exhibited a large surface area, more sites, abundant active species (V4+/VO2+) secondary Keg...
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