7782-61-8Relevant articles and documents
Environmentally Benign Solution-Based Procedure for the Fabrication of Metal Oxide Coatings on Metallic Pigments
Bies, Thorsten,Hoffmann, Rudolf C.,Huber, Adalbert,Schneider, J?rg J.,St?ter, Matthias
, p. 1251 - 1263 (2020)
Aluminum pigments were coated with Fe2O3 and CuO by solution-based thermal decomposition of the urea nitrate compounds hexakisureairon(III)nitrate and tetrakisureacopper(II)nitrate. The deposition process was optimized to obtain homo
IRON/SHIKONIN NANO-COMPOSITE AND USE THEREOF AND METHOD FOR PREPARING THE SAME BY SUPERMOLECULAR SELF-ASSEMBLY
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, (2022/03/19)
An iron/shikonin nano-composite and a use thereof, and a method for preparing the same by supermolecular self-assembly, belonging to the technical field of functional materials. The composite consists of shikonin and ferric ions, wherein shikonin is coordinated with the ferric ions, and the hydroxyl and carbonyl groups in shikonin are coordinated with the ferric irons to form a complex, which is then assembled by π-π stacking and hydrophobic interactions to form a nano-composite which exhibits glutathione response. The composite is obtained by the following steps: adding an aqueous solution of a ferric salt and an organic solvent solution of shikonin in sequence into water while stirring at ambient temperature, continuously stirring at ambient temperature, and centrifuging the resulting mixture to purify, thereby obtaining an iron/shikonin nano-composite in the resulting solution.
The kinetics of hydrochemical oxidation of iron(II) persulfide (pyrite) by nitric acid
Sobolev,Lutsik,Potashnikov
, p. 757 - 759 (2007/10/03)
The kinetics of pyrite oxidation by nitric acid was studied by the rotating disk method. The conditions of kinetically and diffusion-controlled processes were determined. At nitric acid concentrations below 9 mol/dm3, the reaction proceeded in a mixed mode close to kinetically controlled, and the products of acid reduction had an autocatalytic action on the rate of pyrite oxidation. At HNO3 concentrations exceeding 11 mol/dm3, the reaction proceeded in a mixed mode close to diffusion-controlled, and the rate of the reaction sharply decreased. The reason why pyrite reacted with concentrated nitric acid at a low rate was a decrease in the solubility of reaction products.
The Kinetics of Formation of Chromium(III) and Iron(III) Polynuclear Hydroxo Complexes in Nitrate Solutions
Kopylovich,Baev,Chernik
, p. 1552 - 1556 (2008/10/08)
The kinetics of Cr3+, Fe3+, and Cr3+-Fe3+ hydrolysis in nitrate solutions at various temperatures is studied by spectrophotometry and potentiometry. The kinetic parameters of formation of polynuclear hydroxo complexes in the systems are determined by using the transformation coefficients.
Investigation of montmorillonite-based clays in the preparation of supported ferric nitrate
Bekassy, Sandor,Cseri, Tivadar,Bodas, Zoltan,Figueras, Francois
, p. 357 - 364 (2008/10/08)
A series of montmorillonite-based clays (KSF, KSF/0, K0, KP10, K10, KS from Sued-Chemie) were obtained by treating a Bavarian bentonite with different acids and a Hungarian bentonite (Mad), and were used for the preparation of supported hydrated iron(III) nitrates. The clay supports were characterized by different methods (chemical analysis, nitrogen adsorption, X-ray powder diffraction, thermal analysis and solid-state NMR) and the acidity of these solids was determined by infrared spectroscopy using pyridine as a molecular probe. The supported iron nitrate reagents were investigated by thermal and X-ray powder diffraction methods. The iron nitrate is present on the support as an amorphous hydrate. The decomposition of the nitrate is shifted towards lower temperature when it is supported and starts at 35-40 C. The supported iron nitrate reagents show high activities and selectivities in the oxidation of benzyl alcohol to benzaldehyde. The high specific surface area and the Bronsted acidity of the support are determining factors for the chemical activity of the supported system. The supported reagents prepared according this procedure can be stocked for as long as six months without any loss of chemical properties. CNRS-Gauthier-Villars.
Enzymatic oxidation of glycolic acid in the presence of non-enzymatic catalyst for decomposing hydrogen peroxide
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, (2008/06/13)
A process for the production of glyoxylic acid by reacting glycolic acid and oxygen in an aqueous solution at pH 7-10 in the presence of the enzyme glycolate oxidase and a non-enzymatic catalyst for the decomposition of hydrogen peroxide, and an amine buffer capable of forming a chemical adduct with glyoxylic acid.
5,6,7-Trinor-4,8-inter-m-phenylene prostaglandin I2 derivatives useful in anti-ulcer, hypotensive and platelet aggregation inhibiting compositions
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, (2008/06/13)
A compound of the formula STR1 wherein R1 is a pharmaceutically acceptable cation, hydrogen or n-alkyl of 1 to 12 carbon atoms; R2 is hydrogen, acyl of 2 to 10 carbon atoms or aroyl of 7 to 13 carbon atoms; R3 is hydrogen, acyl of 2 to 10 carbon atoms or aroyl of 7 to 13 carbon atoms; R4 is hydrogen, methyl or ethyl; R5 is n-alkyl of 1 to 5 carbon atoms; n is an integer of 0 to 4; A is --CH2 --CH2 -- or trans --CH=CH--; and X is --CH2 --CH2 -- or trans --CH=CH--. The compounds are useful in anti-ulcer, hypotensive and platelet aggregation inhibiting compositions.
Process for producing p-xylene
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, (2008/06/13)
In a process for producing p-xylene which comprises catalytically methylating toluene with a methylating agent in the gaseous phase, the improvement wherein (a) said methylation is carried out continuously in a multi-stage reaction system consisting of a plurality of separate series-connected fixed catalyst layers without separating the resulting xylenes in an intermediate stage, (b) said toluene is fed together with hydrogen gas into only the first-stage fixed catalyst layer and passed successively through the subsequent fixed catalyst layers, the amount of toluene fed being such that the total weight hourly space velocity of toluene is from 1 to 300 hr-1, (c) said methylating agent is fed into each of said fixed catalyst layers, if desired together with hydrogen gas, the amount of the methylating agent fed into each catalyst layer being 0.01/t moles to 1/t moles, in which t is the number of methyl groups in the methylating agent, per mole of toluene fed into the first-stage catalyst layer, and the total amount of the methylating agent fed into all of the catalyst layers being within the range of 0.1/t moles to 2/t moles, in which t is as defined, per mole of toluene fed into the first-stage catalyst layer, and (d) each fixed catalyst layer is filled with a catalyst composed of a crystalline aluminosilicate containing magnesium oxide or lanthanide oxide.