Hydrotalcite reconstructed by in situ rehydration as a highly active solid base catalyst and its application in aldol condensations

Transesterification of rapeseed oil by Mg–Al mixed oxides with various Mg/Al molar ratio

“…Dehydration takes place in two minor steps followed by a step at around 200 °C. The third step corresponds to the loss of OH − groups and decomposition of CO 3 2− in the LDH structure and can be observed at around 380-400 °C [28]. In our case, the shapes of the TGA curves and the positions of the DTA peaks demonstrate differences among the used materials.…”

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

“…Among solid catalysts, double layered hydroxides (hydrotalcites) with basic character are considered as the most promising catalysts for this reaction [8,[11][12][13][14][15]. The essential disadvantages of such basic catalysts are their high sensitivity to ambient CO 2 , which transforms them into catalytically inactive carbonates, and the lack of reliable methods for recovering their catalytic properties after regeneration [16][17][18]. Recently, zeolites have been reported as catalysts for aldol condensation of furfural with acetone [19].…”

Synthesis of cyclohexanone-formaldehyde resin catalyzed by rehydrated Mg–Al hydrotalcite

“…Among various solid base catalysts, hydrotalcite-like compounds ([M 2+ 1−x M 3+ x (OH) 2 ] x+ A n− x/n ·mH 2 O) and their derivatives such as double metal oxides have been focused because their basicity can be tuned based on the diversity of cations and anions [3][4][5][6]. The tuning methods include changing cations during the synthesis and post anion exchange [7][8][9][10][11]. By now, hydrotalcitelike compounds and their derivatives have been used to catalyze * Corresponding author.…”