نتایج جستجو برای: keggin type structure

تعداد نتایج: 2715186  

2008
Xiang-Min Chen De-Song Wang Qing-Zhi Luo Ran Wang

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...

Fatemeh Bamoharram Hossein Abdi Oskooie M. Majid Heravi, Rahim Hekmatshoar Sodeh Sadjadi

 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 ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

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...

Journal: :Catalysis Today 2021

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...

Journal: :chemistry of solid materials 2015
m. ali nia asli m. a. rezvani m. oveisi l. abdollahi

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  ...

Journal: :Catalysts 2021

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...

Journal: :Microporous and Mesoporous Materials 2017

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