Preparation of sulphur-modified Mg-Al hydrotalcite and catalytic performance to the Aldol condensation reaction

A CaMnAl-hydrotalcite solid basic catalyst was prepared based on the memory effect of LDHs, which exhibited extremely high heterogeneous catalytic performance toward the aldol condensation reaction.

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Preparation of two different crystal structures of cerous phosphate as solid acid catalysts: their different catalytic performance in the aldol condensation reaction between furfural and acetone

RSC Advances ◽

10.1039/c9ra02937k ◽

2019 ◽

Vol 9 (30) ◽

pp. 16919-16928 ◽

Cited By ~ 3

Author(s):

Wenzhi Li ◽

Mingxue Su ◽

Tao Yang ◽

Tingwei Zhang ◽

Qiaozhi Ma ◽

...

Keyword(s):

Crystal Structures ◽

Liquid Fuel ◽

Solid Acid ◽

Aldol Condensation ◽

Condensation Reaction ◽

Catalytic Performance ◽

Solid Acid Catalysts ◽

Acid Catalysts ◽

Aldehydes And Ketones ◽

Aldol Condensation Reactions

Liquid fuel intermediates can be produced via aldol condensation reactions through furan aldehydes and ketones driven from biomass.

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Catalytic Synthesis of Methacrolein via the Condensation of Formaldehyde and Propionaldehyde with L-Proline Intercalated Layered Double Hydroxides

Catalysts ◽

10.3390/catal12010042 ◽

2021 ◽

Vol 12 (1) ◽

pp. 42

Author(s):

Longxin Ju ◽

Gang Li ◽

Hongxian Luo

Keyword(s):

Layered Double Hydroxides ◽

Aldol Condensation ◽

Condensation Reaction ◽

Catalytic Performance ◽

Operating Conditions ◽

Coupling Reactions ◽

Reaction Conditions ◽

Step Procedure ◽

Aldol Condensation Reactions ◽

Double Hydroxides

Aldol condensation reactions are very important C–C coupling reactions in organic chemistry. In this study, the catalytic performance of layered double hydroxides (LDHs) in the aldol condensation reaction of formaldehyde (FA) and propionaldehyde (PA) was investigated. The MxAl-LDHs (denoted as re-MxAl–LDHs; M = Ca and Mg; X = 2–4), as heterogeneous basic catalysts toward the aldol condensation reaction, were prepared via a two-step procedure. The catalyst exhibited a high PA conversion (82.59%), but the methacrolein (MAL) selectivity was only 36.01% due to the limitation of the alkali-catalyzed mechanism. On this basis, the direct intercalation of L-proline into LDHs also has been investigated. The influences of several operating conditions, including the temperature, reaction time, and substrate content, on the reaction results were systematically studied, and the optimized reaction conditions were obtained. The optimized Mg3Al–Pro-LDHs catalyst exhibited a much higher MAL selectivity than those of re-MgxAl–LDHs.

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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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