139-12-8Relevant articles and documents
Acid-Mediated Synthesis of Ordered Mesoporous Aluminosilicates: The Challenge and the Promise
Krishna, Nunna V.,Selvam, Parasuraman
, p. 1604 - 1612 (2017)
A new intrinsic hydrolysis method was employed, for the first-time, to synthesize well-ordered H-AlSBA-15 with trivalent aluminium exclusively in the tetrahedral framework structure of SBA-15. Unlike other methods, which involve incorporation of aluminium ions in both the framework (Br?nsted) and non-framework (Lewis) sites of the silicate matrix, the intrinsic hydrolysis method isomorphously substitutes aluminium ions in the tetrahedral network even at high aluminium content. This unique approach relies mainly on the hydrolysis rates of the inorganic (silicon and aluminium) precursors used for the preparation in such a way that the condensation occurs simultaneously so as to overcome the usually encountered difficulties in stabilizing aluminium ions in the silicate matrix. In this way, we could successfully synthesize high quality Br?nsted acidic H-AlSBA-15, hitherto not reported. The synthesized materials were systematically characterized by various analytical, spectroscopic, and imaging techniques, including XRD, Brunauer–Emmett–Teller (BET) surface area measurements, TEM, SEM,29Si and27Al magic angle spinning NMR spectroscopy, X-ray fluorescence (XRF), and NH3temperature-programmed desorption (TPD). The characterization results reveal the presence of a highly porous structure (with narrow pores) and tetrahedrally coordinated trivalent aluminium in the silicate matrix with more medium to strong Br?nsted acid sites. The resulting high quality catalysts exhibit excellent activity for tert-butylation of phenol with high selectivity towards para-tert-butyl phenol and 2,4-di-tert-butyl phenol.
Bi-inorganic-ligand coordinated colloidal quantum dot ink
Jiang, Xianyuan,Li, Hansheng,Shang, Yuequn,Wang, Fei,Chen, Hao,Xu, Kaimin,Yin, Ming,Liu, Hefei,Zhou, Wenjia,Ning, Zhijun
, p. 9483 - 9486 (2019)
Quantum dot light emitting diodes (QLEDs) are rising as a promising light emitting technology. However, the widely used insulating organic ligands hamper carrier injection. Herein, we developed a bi-inorganic-ligand strategy to replace organic ligands and dispersed QDs in a benign solvent butylamine. The all-inorganic QD film shows enhanced luminescence intensity and superior thermal stability and conductivity. In the end, we exploited the first prototype all inorganic QLED.
Oxygen activation on metallic centers and oxidizing abilities of such oxygen
Zaburdaeva, Elena A.,Dodonov, Viktor A.,Stepovik, Larisa P.
, p. 1265 - 1268 (2007)
It was shown that metallcontaining peroxides such as XOOOBu-t [X = (t-BuO)2Al, (t-BuO)3Ti] generate molecular oxygen in the electron-excited singlet state (1O2). These ozonides and η2-peroxocomplex Ph3Bi(η2O2) demonstrate high oxidative activity towards some classes of organic substances under mild conditions (20 °C).
Thermal properties of fluoride glasses and their gel precursors
Melnikov,Rolim,Delben,Delben,Souza,Job
, p. 87 - 93 (2004)
Xerogels were prepared from zirconium, barium, aluminum, lanthanum and lithium acetates, corresponding to a Li containing ZBLA composition. The study of their thermal properties (DSC, TG/DTG, FT-IR) showed that they might be used as chemically stable precursors in the preparation of fluoride glasses. Hydrofluoric acid in solution was chosen as a mild fluorinating agent. This newly proposed technique of fluorinating allowed to obtain high quality ZBLALi glass which presents the advantage of higher thermal stability and homogeneity in comparison with the glass obtained using individual commercial fluorides.
Nanostructured alumina from freeze-dried precursors
Villanueva, Regina,Gomez, Andres,Burguete, Pedro,Martinez, Eduardo,Beltran, Aurelio,Sapina, Fernando,Vicent, Monica,Sanchez, Enrique
, p. 237 - 244 (2011/03/21)
Nanocrystalline alumina has been obtained on the 100 g scale by thermal decomposition of precursors resulting from the freeze-drying of aqueous solutions of different aluminum-containing products, namely aluminum acetate and aluminum l-lactate. Samples prepared at different temperatures (from 873 to 1573 K in steps of 100 K) were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and surface area measurements. In the acetate case, the transformation sequence involves the formation of θ-Al2O3 as an intermediate phase between γ-Al2O3 and α-Al 2O3, whereas this θ phase is not observed in the lactate case. TEM and SEM images show the nanoparticulate character of the aluminas obtained at relatively low temperatures, with typical particle size in the 5-10 nm range. Progressive grain growth occurs as temperature increases. Otherwise, the precursor characteristics have a clear influence on the microstructure of the resulting aluminas, as reflected also by the measured BET surface area values. Whereas long aluminum acetate fibers results in open arrays of low aggregated alumina particles, large aluminum lactate sheets lead to comparatively compact alumina microstructures. Nanostructured alumina obtained from the lactate precursor has been reconstituted in a granulated powder with sufficient consistence and flowability to allow it to be thermal sprayed and deposited on a stainless steel substrate. XRD data show that γ-Al 2O3 is the major phase in the coating, which includes also α-Al2O3 particles. SEM results offer evidences on the nanostructured character of the coating.
Liquid-phase oxidation of sulfides by an aluminum (and titanium) tert-butoxide - tert-butyl hydroperoxide system
Dodonov,Zaburdaeva,Stepovik
, p. 1729 - 1734 (2007/10/03)
A system aluminum (and titanium) tert-butoxide-tert-butyl hydroperoxide (1 : 2) under mild conditions (20°C, 1 h) oxidizes aliphatic and alkylaromatic sulfides and diphenyl sulfide to the corresponding sulfones in yields close to ~100%. The oxidation is induced by electron-excited dioxygen formed upon thermal decomposition of intermediate metal-containing peroxy trioxides (ozonides). The latter are formed as a result of the reversible reaction of aluminum or titanium tert-butoxides with tert-butyl hydroperoxide followed by the interaction of di-tert-butoxy-tert-butylperoxyaluminum and tri-tert-butoxy-tert-butylperoxytitanium that formed with another Bu tOOH molecule. Alkminum-containing peroxide (ButO) 2AlOOBut oxidizes sulfides to sulfoxides.
Method of preparing stable aluminum acetate solutions
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, (2008/06/13)
This invention concerns the utilization of salts of alpha hydroxy carboxylic acids as stabilizers toward aging, boiling and dilution of aqueous aluminum acetate solutions. It also utilizes basic aluminum halides, other than fluorides, having the formula Al2 (OH)6-m Clm where m=1-5 or the formula Al(OH)3-n Cln where n=1-2, as starting aluminum raw material. The produced solutions are basic aluminum acetates with a pH that ranges from 2.0-7.0.
Method for the preparation of tetraalkyl-tin
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, (2008/06/13)
A method is disclosed for the preparation of tetraalkyl-tin wherein tin-tetraacetate is first dispersed in tetrahydrofuran and trialkyl-aluminum is slowly added to the dispersion in an amount sufficient to cause complete reaction. The reaction is carried out at a temperature of 80° C. The reaction mixture is then heated to the reflux temperature of the tetrahydrofuran for about 1 to 2 hours and until complete reaction. The aluminum triacetate is then removed and the tetrahydrofuran is distilled off.
Method for the preparation of dialkyl-tin-dichlorides
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, (2008/06/13)
A method is disclosed for the production of dialkyl-tin-dichlorides whose alkyl groups have 1 to 22 carbon atoms. Trialkyl-aluminum is slowly added to a solution of tin-diacetate-dichloride and tetrahydrofuran in the mole ratio of about 2:3. The aluminum-triacetate precipitating during the reaction is removed by filtration and the tetrahydrofuran used as solvent is removed by distillation.
Preparation of an oxy-acetyl compound
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, (2008/06/13)
This invention provides a process for producing an oxy-acetyl compound by carbonylating an oxy-methyl compound with carbon monoxide in the presence of a rhodium catalyst, an iodine compound, and a metallic accelerator, and also in the presence of at least one compound selected from the group consisting of boron compounds, bismuth compounds, and tertiary amide compounds in the reaction system. When at least one of the bismuth or boron compound is present in the reaction system, the carbonylation reaction can proceed without precipitation of any metallic accelerator.