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Aluminovanadate Oxynitride Catalyst: Proposition for the Basic Site [PDF]
The Journal of Physical Chemistry B, 1999 An aluminovanadate oxynitride (AlVON) catalyst is synthesized. This catalyst is active in the Knoevenagel condensation reaction between malononitrile and benzaldehyde, showing that it has basic sites. DRIFT characterization has evidenced the presence of ammonium ions due to the neutralization by ammonia of hydroxyl Bronsted acid sites.
Hugues M. Wiame +2 more
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Application of red mud as a basic catalyst for biodiesel production
Journal of Environmental Sciences, 2013Red mud was investigated in triglyceride transesterification with a view to determine its viability as a basic catalyst for use in biodiesel synthesis. The effect of calcination temperature on the structure and activity of red mud catalysts was investigated. It was found that highly active catalyst was obtained by simply drying red mud at 200 degrees C.
Chengcheng Li, Chunli Xu
exaly +3 more sources
Basicity of alumina-magnesia catalysts
Reaction Kinetics and Catalysis Letters, 1980In the series of Al2O3, MgO and Al2O3−MgO catalysts, those containing about 75% Al2O3 and 25% MgO show the highest activity in the decomposition of diacetone alcohol in non-polar solvents. The fastest rates of reaction, which follows the zero-order kinetics over the whole range of conversion, coincide with the occurrence of strong basic sites on the ...
L. Nondek, J. Málek
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Chiral Bisphosphazides as Dual Basic Enantioselective Catalysts
Chemistry – A European Journal, 2008AbstractChiral bisphosphazides complexed with lithium salts efficiently catalyze the direct enantioselective 1,4‐addition of dialkyl malonates to acyclic enones. Spectroscopic studies on the stoichiometry of the bisphosphazide and lithium salt have indicated the formation of a 1:1 species as the active enantioselective catalyst.
Hiroshi, Naka +3 more
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Design and fabrication of mesoporous heterogeneous basic catalysts
Chemical Society Reviews, 2015Recent advances in mesoporous solid bases were reviewed, and fundamental principles of how to fabricate efficient basic catalysts were highlighted.
Lin-Bing, Sun +2 more
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Characterisation of the basicity of modified MgO-catalysts
Applied Catalysis A: General, 1999Abstract The modification of magnesium oxide with caesium, barium or yttrium oxide was carried out in order to increase its base strength. The decomposition of 2-butanol and 2-methyl-3-butyn-2-ol as well as the FTIR investigation of adsorbed acid probe molecules on the catalysts were used as basicity characterisation methods.
P Thomasson, O.S Tyagi, H Knözinger
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Heterogeneous basic catalysts for biodiesel production
Catalysis Science & Technology, 2016We review the recent advances in the synthesis and utilization of heterogeneous basic catalysts for biodiesel production.
Ana Lúcia de Lima +2 more
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A novel way for ethoxylation with basic catalysts
Journal of the American Oil Chemists' Society, 1983AbstractEthoxylation of dodecyl alcohol catalyzed by alkali hydroxides are accelerated by adding complexing agents for the alkali ions. The rate of ethoxylation could be increased by crown ether and dodecyl alcohols of a higher degree of ethoxylation.
JenŐ Morgós +3 more
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The Journal of Organic Chemistry, 2020
We report a highly efficient ortho-selective electrophilic chlorination of phenols utilizing a Lewis basic selenoether catalyst. The selenoether catalyst resulted in comparable selectivities to our previously reported bis-thiourea ortho-selective catalyst, with a catalyst loading as low as 1%.
Andrew N. Dinh +5 more
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We report a highly efficient ortho-selective electrophilic chlorination of phenols utilizing a Lewis basic selenoether catalyst. The selenoether catalyst resulted in comparable selectivities to our previously reported bis-thiourea ortho-selective catalyst, with a catalyst loading as low as 1%.
Andrew N. Dinh +5 more
openaire +2 more sources
Microcalorimetric characterisation of acid–basic catalysts
Catalysis Today, 1998Abstract Fundamentals of microcalorimetry are briefly reviewed. A heat-flow microcalorimeter of the Tian–Calvet type has been used to obtain information on the differential molar enthalpy of adsorption. Ammonia, pyridine, n-butylamine or CO2 and SO2 have been used to characterize the acid–base properties of several catalysts such as zeolites and ...
Vincenzo Solinas, Italo Ferino
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