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Kinetic and mechanistic study of the synthesis of ionone isomers from pseudoionone on Brønsted acid solids
(Elsevier Science, 2017-11)
The kinetics of the liquid-phase synthesis of α-, β- and γ-ionones from pseudoionone was studied on Brønsted acid solids. Four silica-supported tungstophosphoric acid catalysts containing different heteropolyacid loadings, ...
Ionone synthesis by cyclization of pseudoionone on silica-supported heteropolyacid catalysts
(Elsevier Science, 2009-04)
The liquid-phase cyclization of pseudoionone to ionones (α, β and γ isomers) was studied on silica-supported heteropolyacid (HPA) catalysts containing between 18.8 and 58.5% HPA. The HPA used was tungstophosphoric acid ...
Study of the citral/acetone reaction on MgyAlOx oxides: Effect of the chemical composition on catalyst activity, selectivity and stability
(Elsevier Science, 2008-08)
The liquid-phase citral/acetone reaction was studied on MgO, Al2O3 and MgyAlOx mixed oxides with Mg/Al molar ratios of 0.11-3. The density, strength and nature of surface acid sites were determined by NH3 thermodesorption ...
Synthesis of ionones by cyclization of pseudoionone on solid acid catalysts
(Springer, 2008-07)
Ionone synthesis (α, β and γ isomers) by pseudoionone cyclization was studied on zeolite HBEA, Amberlyst 35W, SiO2-Al 2O3, and unsupported and silica-supported heteropolyacids (HPA/SiO2). Ionone formation was preferentially ...
Aldol condensation of citral with acetone on MgO and alkali-promoted MgO catalysts
(Academic Press Inc Elsevier Science, 2006-06)
The liquid-phase synthesis of pseudoionones (PSs) by cross-aldol condensation of citral with acetone was studied on alkali-promoted MgO catalysts. Alkaline metals (A), including Li, Na, K, and Cs, were added to a high-surface ...
Synthesis of ionones on solid Brønsted acid catalysts: Effect of acid site strength on ionone isomer selectivity
(Elsevier Science, 2010-01)
The effect of Brønsted acid site strength on the liquid-phase conversion of pseudoionone to ionone isomers (α-, β- and γ-ionone) was studied on resin Amberlyst 35W, silica-supported heteropolyacid (HPAS) and silica-supported ...
Citral condensation with acetone on Na-MgO and Li-MgO catalysts
(Elsevier Science, 2006-01)
The effect of the Na and Li addition to MgO on the pseudo-ionone production from citral and acetone condensation in liquid phase is reported. The Na addition improves the yield to pseudo-ionone (defined as mol of produced ...
beta-Carotene biotransformation to obtain aroma compounds
(Soc Brasileira Ciencia Tecnologia AlimentosCampinasBrasil, 2010)
β-carotene biotransformation to obtain aroma compoundsBiotransformação de β-caroteno para obtenção de compostos de aroma
(Sociedade Brasileira de Ciência e Tecnologia de Alimentos, 2010)