Abstract
ABSTRACTA series of hydrotalcite-like compounds with various Cu:Mg:Al molar ratios were prepared by the co-precipitation method. The catalytic performance for oxidative esterification of aldehydes was investigated. X-ray diffraction, N2 adsorption–desorption (BET), hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy, the scanning electron microscope (SEM), the transmission electron microscope and atomic absorption spectrometry were used to characterize the catalysts. The results showed that the benzyl benzoate product was obtained in good to excellent yield using tert-butyl peroxybenzoate as oxidant at 90°C under air atmosphere over Cu2Mg1Al1-LDH catalyst. The catalyst can be recovered and used with 45% conversion after recycling five times. The oxidative esterification reaction in the heterogeneous system is environmentally friendly.The Cu2Mg1Al1-LDH catalyst prepared by co-precipitation method showed high catalytic activity for oxidative esterification of aldehydes. 81.0% yield of benzyl benzoate with benzaldehyde and toluene as reactants was obtained using tert-butyl peroxybenzoate as oxidant at 90°C under air atmosphere over Cu2Mg1Al1-LDH catalyst. The catalyst can be recovered and used with 45% conversion after recycling five runs. The oxidative esterification reaction in the heterogeneous system is environmentally friendly.
Highlights
Carboxylic esters are widely used in the fields of materials, pharmaceuticals, perfumes, coatings and cosmetics
The results showed that the benzyl benzoate product was obtained in good to excellent yield using tert-butyl peroxybenzoate as oxidant at 90°C under air atmosphere over Cu2Mg1Al1-LDH catalyst
A series of hydrotalcite-like compounds containing copper were prepared, and the effects of these catalysts were studied in oxidative esterification for the synthesis of the carboxylic ester from toluene and benzaldehyde
Summary
Hydrotalcite compounds are layered double hydroxides that are composed of positively charged two-dimensional brucite layers with anionic species such as hydroxide and carbonate located in the interlayers. Hydrotalcite compounds have unusual physical–chemical properties due to their unique layered structure, including high thermal stability, tunable components, acidic–basic properties and structure memory effects [8]. Based on these properties, hydrotalcite compounds have been widely used in the field of catalysis, in organic synthesis, in recent years [9–11]. We initiate the investigation by reacting toluene with benzaldehyde in the presence of CuMgAl hydrotalcite catalyst. A series of hydrotalcite-like compounds containing copper were prepared, and the effects of these catalysts were studied in oxidative esterification for the synthesis of the carboxylic ester from toluene and benzaldehyde
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