44169-27-9Relevant academic research and scientific papers
Glycerol dehydration to hydroxyacetone in gas phase over copper supported on magnesium oxide (hydroxide) fluoride catalysts
Célerier, Stéphane,Morisset, Sophie,Batonneau-Gener, Isabelle,Belin, Thomas,Younes, Khaled,Batiot-Dupeyrat, Catherine
, p. 135 - 144 (2018/04/05)
The dehydration of glycerol to hydroxyacetone was studied over copper-based catalysts using magnesium oxide (hydroxide) fluoride with various F/Mg ratio as support of copper. After calcination at 350 °C, the incorporation of copper, mainly at + II oxidation state, into the support lattice was observed for MgO and MgF(OH) while, copper was stabilized as Cu+1 at the surface of Cu-MgF2. The reaction of dehydration was performed using a mixture of glycerol and water (80%wt of glycerol), in gas phase at 260 °C. Cu-MgF2 was the most active catalyst with a yield in hydroxyacetone of 45.5%, while the catalytic activity was very low for Cu-MgF(OH) and Cu-MgO (yield in HA 2 were higher than those obtained with La2CuO4, a reference catalyst. After four hours of reaction, Cu-MgF2 was not significantly modified, while for the two other catalysts, Cu2+ initially present was reduced into metallic copper. The results obtained revealed that the basic properties of the catalysts did not govern the reaction of dehydration of glycerol into HA. The best catalyst (Cu-MgF2) was the one possessing the higher amount of Lewis acid sites, and stabilizing copper at + 1 oxidation state.
Monitoring carbonyl-amine reaction and enolization of 1-hydroxy-2- propanone (acetol) by FTIR spectroscopy
Yaylayan, Varoujan A.,Harty-Majors, Susan,Ismail, Ashraf A.
, p. 2335 - 2340 (2007/10/03)
Infrared absorption bands characteristic of the aldehydo, keto, and enediol forms of 1-hydroxy-2-propanone (acetol) were identified and used to study the effect of solvent on the absorption frequencies and the effect of temperature and acid/base catalysis on the enolization reactions. The data indicated that, in addition to water, acids and bases can catalyze the enolization of 1-hydroxy-2-propanone and that the temperature inversely effects the rate of enolization under basic conditions. However, under acidic conditions, increasing the temperature favors the enolization process. In addition, the reaction of 1-hydroxy-2-propanone with a primary and a secondary amine was also monitored by Fourier transform infrared spectroscopy. The data indicated that at room temperature the rate of amine reaction was faster than the rate of its catalysis of enolization; however, below room temperature, the rate of base-catalyzed enolization became comparable with the rate of carbonyl-amine reaction forming both Heyns and Amadori adducts.
