Results 191 to 200 of about 15,400 (230)

Hydrotalcite-Catalyzed Alkylation of 2,4-Pentanedione

Synthetic Communications, 1995
Abstract A synthetic anionic clay, hydrotalcite (Mg/Al = 2.8), calcined under dry air at 450 [ddot]C, has proved to be an efficient catalyst for the selective C-monoalkylation of 2,4-pentanedione with reactive alkylating reagents.
Cativiela, C., Figueras, F., Garcia, J.I., Mayoral, J.A., Zurbano, M.M.   +4 more
openaire   +2 more sources

Comparison between the Cr(VI) adsorption by hydrotalcite and hydrotalcite-gibbsite compounds

Separation Science and Technology, 2015
Cr(VI) adsorption from aqueous solutions on Mg-Al hydrotalcite and Mg-Al hydrotalcite-gibbsite with Al/(Al+Mg) ratios (R) of 0.3 and 0.6 (MgAlHTR = 0.3 and MgAlHTGR = 0.6) was investigated as a function of the pH and chromium concentration. The results showed that the maximum Cr(VI) adsorption by Mg-Al compounds do not depend on the value of R at pH 7.
I. García-Sosa, M. T. Olguín
openaire   +1 more source

Hydrotalcites in Organic Synthesis: Multicomponent Reactions

Current Organic Synthesis, 2018
Background: The use of solid bases as heterogeneous catalysts allows the replacement of conventional bases in Organic Chemistry, being of outmost importance. Lamellar double hydroxides or hydrotalcites are materials having excellent basic properties and high surface areas.
Nope E., Sathicq G., Martinez J., Rojas H., Luque R., Romanelli G.   +5 more
openaire   +3 more sources

Defluoridation Performance Comparison of Nano-hydrotalcite/Hydroxyapatite Composite with Calcined Hydrotalcite and Hydroxyapatite

Water, Air, & Soil Pollution, 2016
Fluoride retention from water is nowadays a serious health problem. This study reports the potential of a newly developed nano-hydrotalcite/hydroxyapatite (n-HT/HAp) composite, and its constituent materials, hydrotalcite (HT) and hydroxyapatite (HAp), in fluoride removal.
Taju Sani, Mohammedali Adem, Geolar Fetter, Pedro Bosch, Isabel Diaz   +4 more
openaire   +1 more source

Hantzsch pyridine synthesis using hydrotalcites or hydrotalcite-like materials as solid base catalysts

Applied Catalysis A: General, 2008
Abstract Multicomponent one-pot synthesis of Hantzsch dihyropyridine (DHP) was achieved by the condensation of benzaldehyde, ethyl acetoacetate and ammonium acetate at room temperature using environmentally friendly as-synthesised medicinally acceptable hydrotalcites (HT) and hydrotalcite-like (HT-like) materials as solid base catalysts.
Churchil A. Antonyraj, S. Kannan
openaire   +1 more source

ChemInform Abstract: Hydrotalcites in Nanobiocomposites

ChemInform, 2012
AbstractReview: 161 refs.
U. Costantino, M. Nocchetti, G. Gorrasi, L. Tammaro   +3 more
openaire   +1 more source

Cannizzaro reactions over calcined hydrotalcite

Applied Clay Science, 2019
Abstract Several aldehydes undergo disproportionation into corresponding acids and alcohols (Cannizzaro reaction) over calcined hydrotalcite, magnesium aluminum layered double hydroxide (LDH), in water. The reactions are slow and ~10% conversions were achieved after stirring for 24 h at room temperature.
null Bhojaraj, Pramod Harley, Michael Rajamathi   +2 more
openaire   +1 more source

Dynamics of water in hydrotalcite

Physica B: Condensed Matter, 1997
Abstract To understand the phenomena underpinning a hydrotalcite's applications, its structural and dynamic properties have been investigated between 308 and 483 K. The results reveal that the dominant motions are associated with lattice water which is confined in a cage.
W. Kagunya, P.K. Dutta, Z. Lei
openaire   +1 more source

Nitrate removal by calcined hydrotalcite-type compounds

Clays and Clay Minerals, 2008
AbstractThe sorption of nitrate ions on calcined hydrotalcite-type compounds at 550°C (HT550), 650°C (HT650), and 850°C (HT850) from pure water solution at 25°C has been studied. The influence of the temperature was also investigated for the sample calcined at 850°C by studying the sorption process at 10 and 40°C.
Soías-Viciana, María M., Ureña-Amate, María D., González-Pradas, Emilio, García-Cortéz, María J., López-Teruel, Cristina   +4 more
openaire   +3 more sources

Selective hydrogenation of furfural to furfuryl alcohol in water under mild conditions over a hydrotalcite-derived Pt-based catalyst

Applied Catalysis B: Environmental, 2022
Ge Gao, Javier Remón, Zhicheng Jiang
exaly