نتایج جستجو برای: Magnetite heterogeneous nanocatalyst

تعداد نتایج: 131630  

Journal: :Dalton transactions 2012
John Mondal Tapas Sen Asim Bhaumik

A magnetic nanoparticle conjugated mesoporous nanocatalyst (Fe(3)O(4)@mesoporous SBA-15) with a high surface area has been synthesized by chemical conjugation of magnetite (Fe(3)O(4)) nanoparticles with functionalized mesoporous SBA-15. Functionalized mesoporous SBA-15 containing surface carboxyl and amino groups was synthesized via the thiol-ene click reaction of cysteine hydrochloride and vin...

Journal: :journal of physical & theoretical chemistry 2011
gh.r. najafi m. saffari m. masteri-farahani f. mollaamin

new type of heterogeneous nanocatalyst for deoximation based on tungsten oxide supported on mesoporousmolecular sieve mcm-41 was developed. this new system representes inexpensive and highly activeheterogeneous nanocatalyst for deoximation under green and mild reaction conditions.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1392

a novel acrylic acid-functionalized fe3o4 magnetic nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperacid in chemical transformations. the structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (tem), thermogravimetric analysis (tga), and ft-ir...

2017
Fatemeh Rajabi Rafael Luque

An immobilized copper Schiff base tridentate complex was prepared in three steps from SBA-15 supports. The immobilized copper nanocatalyst (heterogeneous catalyst) was characterized by Fourier transform infrared spectroscopy (FT-IR), cross polarization magic angle spinning (CP-MAS), 13-carbon nuclear magnetic resonance (13C-NMR), atomic absorption spectroscopy (AAS), thermogravimetric analysis ...

F. Mollaamin Gh.R. Najafi M. Masteri-Farahani M. Saffari

New type of heterogeneous nanocatalyst for deoximation based on Tungsten oxide supported on mesoporousmolecular sieve MCM-41 was developed. This new system representes inexpensive and highly activeheterogeneous nanocatalyst for deoximation under green and mild reaction conditions.

In this work, copper(II) heterogeneous nanocatalyst supported on modified AlPO4 (Cu(II)-DA@Nano AlPO4) was used for the synthesis of some biological active heterocyclic molecules, particularly for the efficient conversion of a wide range of non-activated terminal alkynes to β-hydroxy 1,4-disubstituted 1,2,3-triazolethrough a three-component “click” reaction at room temperature in water. The reg...

Journal: :journal of nanostructures 0
naghmeh divsalar department of inorganic chemistry, faculty of chemistry, university of mazandaran, babolsar, iran niaz monadi department of inorganic chemistry, faculty of chemistry, university of mazandaran, babolsar, iran mahmood tajbaksh department of organic chemistry, faculty of chemistry, university of mazandaran, babolsar, iran

a new recoverable molybdenum nanocatalyst was prepared by immobilization  of a schiff base ligand on the surface of silica coated magnetite nanoparticles (fe3o4@sio2) through condensation reaction between 3-aminopropyl triethoxysilane and 2-hydroxy1-naphthaldehyde and succeeding reaction with dioxomolybdenum(vi) acetylacetonate (moo2(acac)2). the synthesized catalyst was characterized by induct...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1391

in this thesis, we exploit a simple and suitable method for immobilization of copper(ii) complex of 4?-phenyl-terpyridine on activated multi-walled carbon nanotubes [amwcnts-o-cu(ii)-phtpy]. this nanostructure was characterized by various physico-chemical techniques. to ensure the efficiency and fidelity of copper species, the implementation of three-component strategies in click-chemistry all...

Journal: :Chemical communications 2015
Chao Lian Fumin Ren Yuxi Liu Guofeng Zhao Yongjun Ji Hongpan Rong Wei Jia Lei Ma Haiyuan Lu Dingsheng Wang Yadong Li

Heterogeneous selective hydrogenation of ethylene carbonate (EC), a key step in indirect conversion of CO2, was realized over a copper chromite nanocatalyst prepared via a hydrothermal method followed by calcination. The selectivities towards methanol (60%) and ethylene glycol (93%) were higher than those achieved over other usual hydrogenation catalysts.

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