نتایج جستجو برای: sulfuric acid magnetic nanocatalyst

تعداد نتایج: 1073764  

2014
Hui ZHANG Huimin MENG

Electrolytic manganese dioxide (EMD) was prepared by using gas diffusion electrode (GDE) instead of traditional hydrogen evolution cathode. Sulfate acid’s effects on the cell voltage, the current efficiency, the electro-catalytic activity and the lifetime of GDE are studied. The results show that as the concentration of sulfuric acid increases, the current efficiency increases, while the cell v...

بیژن زاده, احسان, شکاری, محمدرضا, محمودی, علیرضا,

Prspopis Juliflora and acacia Acacia victoriae species of precious and semi-arid and arid regions that are compatible with wood and charcoal production, soil conservation, forage production and medicinal value are very important and acacia, and stimulated their germination has been studied. Treatments used to overcome seed dormancy were treated with concentrated sulfuric acid 98% (H2so4), 15 mi...

Journal: :iranian journal of catalysis 2016
zahra lasemi bahareh sadeghi fereshteh amiri tavasoli

nano silica sulfuric acid as a solid acid, was described to be an effective catalyst for one-pot three-component reaction of kojic acid, aryl aldehydes and indoles for the preparation of 2-substituted aryl (indolyl) kojic acid derivatives. the catalyst was prepared by combination of chlorosulfonic acid to nano silica gel. the size of nanoparticles were observed with sem.all prepared compounds w...

Journal: :organic chemistry research 0
habib ollah foroughi department of scince, islamic azad university, fasa branch ali khalafi-nezhad department of chemistry, shiraz university, shiraz,71454, i.r.iran

the silica boron sulfuric acid nanoparticles (sbsans) as an efficient heterogeneous solid acid catalyst with both brønsted and lewis acidic sites catalyzed the preparation of bis-4-hydroxycoumarin derivatives using reaction of aldehydes and 4-hydroxycoumarin under mild and solvent-free condition at room temperature. this new and efficient methodology has advantages in comparison with currently ...

Journal: :Journal of the American Oil Chemists' Society 1972
N Kins J Barandy

The electron capture gas liquid chromatography test method for chick edema factor has been modified by replacing the alumina column s t ep with an additional sulfuric acid cleanup and a caustic wash which permits a reduction in sample cleanup time. Samples are subjected to double preliminary sulfuric acid cleanup and caustic wash and extracted each time with t r imethyl pentane. The final extra...

A. Javidan M.J. Taghizadeh O. Hosseinchi

A new magnetic nanocatalyst has been prepared using immobilization of vanadate onto aminopropyl functionalized SiO2/Fe3O4(VO3-/NH3+-SiO2/Fe3O4). The obtained magnetic catalyst was characterized by FT-IR, XRD, VSM and SEM techniques and used for sulfoxidation of sulfide compounds to the correspondingsulfoxides in presence of H2O2 as oxidant at room temperature. The optimum of reaction conditions...

2003
P. A. LEVENE M. YAMAGAWA

A number of the components of the tissues contain in their molecules either phosphoric or sulfuric acid. The phosphoric acid radicle is contained in the monoand polynucleotides, and the sulfuric acid radicle in chondroitinand mucoitin-sulfuric acids. In all these compounds the acid radicle is linked in ester form to either a carbohydrate or a polyhydric alcohol. On long acquaintance with substa...

Journal: :analytical and bioanalytical chemistry research 0
masoud shariati-rad department of analytical chemistry, faculty of chemistry, razi university, kermanshah, iran mohsen irandoust department of analytical chemistry, faculty of chemistry, razi university, kermanshah, iran nasrin mozaffarinia department of analytical chemistry, faculty of chemistry, razi university, kermanshah, iran

formaldehyde in small quantities is commonly analyzed by spectrophotometric methods. one of the most-commonly used spectrophotometric techniques for this purpose is based on the reaction with chromotropic acid. because of its simplicity, sensitivity, selectivity and its low cost, it is still widely used. investigations for replacing the concentrated sulfuric acid with other acids or using more ...

Ali Maleki, Razieh Firouzi-Haji Reza Ghalavand

In this study, a novel and environmentally benign o-phenylendiamine stabilized on silica-coated Fe3O4 magnetic nanocatalyst (Fe3O4@SiO2@propyltriethoxysilane@o-phenylendiamine-SO3H/HCl) as a hybrid magnetic organometallic nanocatalyst has been synthesized. After that, the structure of this new catalyst was compl...

2016
Mario Simon Andreas Kürten Tuija Jokinen Nina Sarnela Mikko Sipilä Linda Rondo Sebastian Ehrhart Heikki Junninen Manuel Hutterli Jasper Kirkby Douglas R. Worsnop Joachim Curtius

Recent studies suggest that dimethylamine could be a key ternary species in the formation and early growth of atmospheric aerosol particles. We report on nucleation studies for the ternary system of sulfuric acid, water and dimethylamine which have been performed at the CERN CLOUD chamber. These studies were conducted at atmospherically relevant concentrations of sulfuric acid and dimethylamine...

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