Aldol Condensation Reaction of Methyl Acetate and Formaldehyde Over Cesium Oxide Supported on Silica Gel: An Experimental and Theoretical Study

Two types of catalysts, V2O5-P2O5/SiO2and Cs-Sb2O5/SiO2, were separately prepared with SiO2as carrier. Their catalytic properties were investigated in the process of synthesizing methyl acrylate through aldol condensation with methylal and methyl acetate, and the influence of the catalyst’s filling up technique on the reaction was studied. Reactions were performed in a fixed-bed reactor. The research results indicate that aldol condensation reaction is effectively promoted when the two catalysts were filled up in appropriate subsections of the reaction tube. Specifically, when V-Si-P Oxide was filled up at the 4thsubsection and Cs-Sb2O5/SiO2catalyst at the 6thsubsection with the temperature of the reactor at 400 °C and the mol ratio of methyl acetate and methylal at 1.6:1 and the space velocity at 3.2 h-1, then the conversion rate of methylal was 50.9%, the selectivity of methyl acrylate was 90.63%, and the ester yield of methyl acrylate was 46.15%.

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Experimental and Theoretical Study for Vapor Phase Aldol Condensation of Methyl Acetate and Formaldehyde over Alkali Metal Oxides Supported on SBA-15

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.7b02841 ◽

2018 ◽

Vol 57 (8) ◽

pp. 2773-2786 ◽

Cited By ~ 4

Author(s):

Teng He ◽

Yixin Qu ◽

Jidong Wang

Keyword(s):

Alkali Metal ◽

Metal Oxides ◽

Vapor Phase ◽

Methyl Acetate ◽

Theoretical Study ◽

Aldol Condensation

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Nonanal Sensor Fabrication Using Aldol Condensation Reaction Inside Alkali-Resistant Porous Glass

IEEE Sensors Journal ◽

10.1109/jsen.2021.3055264 ◽

2021 ◽

pp. 1-1

Author(s):

Masato Tsujiguchi ◽

Takashi Aitoku ◽

Hironori Takase ◽

Yasuko Yamada Maru

Keyword(s):

Porous Glass ◽

Aldol Condensation ◽

Condensation Reaction ◽

Sensor Fabrication

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Liquid-phase aldol condensation of cyclohexanone on aluminium and iron oxides

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19822235 ◽

1982 ◽

Vol 47 (8) ◽

pp. 2235-2245 ◽

Cited By ~ 8

Author(s):

Zdeněk Vít ◽

Lubomír Nondek ◽

Jaroslav Málek

Keyword(s):

Iron Oxides ◽

Aldol Condensation ◽

Condensation Reaction ◽

Complex Function ◽

Acid Sites ◽

Basic Site ◽

Catalyst Poisoning ◽

Iron Hydroxides ◽

Transient Complex ◽

Kinetics Of

The kinetics of the aldol condensation of cyclohexanone in decalin were investigated at 210 °C on catalysts prepared by drying and calcining the aluminium and iron hydroxides at 110-850 °C. The effect of catalyst poisoning by benzoic acid and pyridine on the course of the condensation reaction and aldol retroaldolisation was also examined. The kinetics of the cyclohexanone condensation can be described by means of Langmuir-Hinshelwood equations which are in agreement with a mechanism involving adsorption of cyclohexanone on a basic site to form a transient complex, reaction of this complex with a cyclohexanone molecule affording the aldol, the rate determining interaction of the aldol with free basic and acid sites yielding 2-(1-cyclohexen-1-yl)cyclohexanone and water and desorption of these products from the catalyst surface. The proposed kinetic model is supported by the results of catalyst poisoning. The activity of aluminium and iron oxides in the condensation of cyclohexanone is a complex function of their basicity and acidity depending strongly on the calcination temperature.

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