تهيه و شناسايي نانو ذرات هيبريد شده Ni-Mo روي بستر Al2O3 -TiO2 و Al2O3-ZrO2 و كاربرد آنها در واكنش اكسايش تولوئن; كاربرد نانو ذرات پالاديم روي بستر بنتونيت و سيليكا در واكنش جفت شدن هك

چكيده انگليسي :

Synthesis and Characterization of Hybrid Nano Particles of Mo Ni Immobilized on Al2O3 TiO2 and Al2O3 ZrO2 and Its Application for Oxidation of Toluene Application of Nano Particles of Pd Immobilized on Bentonite and SiO2 in Heck Cross Coupling Elham Gholizadeh l ham1985@yahoo com Feb 12 2011 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Degree M Sc Language Farsi Prof M Ghiaci Email mghiaci@cc iut ir Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Abstract Nowadays most of the researches are focused on metal nano particles They have unique properties on magnetic electronic optical and chemical behavior compared to bulk materials because of their large surface area to volume ratio Transition metal nano particles have the high catalytic activities in organic reactions But the soluble metal nano particles have some problems such as recycling and separation of these catalysts from reactions To solve these problems it would be better to immobilize them on suitable support materials and use them as heterogeneous catalysts Therefore most of current researches are focused on modification of different supports for immobilization of metal nano particles However inorganic solids such as silica carbon clay zeolites and mixed oxides are widely used to carry metal nano particles In the first project nano hybridized Ni Mo was prepared in reverse micelle of bis 2 ethylhexyl sulfosuccinate AOT then was deposited on the surface of mixed oxide such as Al2O3 TiO2 and Al2O3 ZrO2 These mixed oxides are synthesized by sol gel procedure Depositing of these nano particles on the surface was done by using ultrasonic waves For characterization of these catalysts XRD Uv vis BET TEM analysis were used Then these catalysts were used in oxidation of toluene The products were analyzed by GC and GC MS Furthermore the reaction conditions were changed for the reaction In the second project an organo bentonite was loaded with the first generation of amidoamine hyperbranch cascade 3 3 dodecylazanediyl bis N 2 2 aminoethylamino ethyl propionamide DAEP which has a long aliphatic tail C12 and a hydrophilic head The hydrophilic head of DAEP has served as a pincer type chelating agent for Pd nano particles A similar chelating agent was immobilized onto the surface of a porous silica gel The modified bentonite and the modified silica gel were used as a support with chelating sites for immobilization of the palladium nano particles The catalytic performance was examined in the Heck reaction The products were analyzed by GC and GC MS Furthermore the reaction conditions were optimized for the reaction The catalysts showed excellent activity towards Heck coupling For this reaction Iodobenzene was reacted with some olefins such as methyl acrylate styrene tert butyl acrylate acrylic acid methyl vinyl ketone DMF and NaOAc were used as solvent and base respectively The reaction was done in 130 C The best reaction time for modified bentonite catalyst was 12 h and the best reaction time for modified silica catalyst was 29 h The immobilized palladium complexes efficiently catalyzed the Heck reaction are recyclable under aerobic conditions and exhibit hardly any leaching Keyword Nano hybridized Ni Mo mixed oxide sol gel Al2O3 TiO2 Ni Mo Al2O3 ZrO2 Ni Mo oxidation of toluene palladium nano particles Heck cross coupling

قلي زاده، الهام

مخلوط اكسيد فلزي , سل-ژل , نانو ذرات پالاديم