Abstract
In this study, Mg–Al–CO3 hydrotalcite (Mg–Al LDH) as a promising base catalyst was used for the synthesis of 1-methoxy-2-propanol (MP) from propylene oxide and methanol. Mg–Al LDHs were prepared by urea decomposition and coprecipitation methods. The effect of preparation method on the microstructure, the basic properties and the catalytic performance of Mg–Al LDHs was studied combining XRD, FTIR, TG–DTA, SEM and Hammett titration method. The results indicate that the urea method increased the crystallinity of Mg–Al LDH with well-developing hexagonal plate-shaped particles. Compared to the coprecipitation sample (T-LDH), the urea sample (U-LDH) possessed a higher crystallinity with larger specific surface area and aspect ratio, which also related with a higher catalytic activity. High crystallinity and large specific surface area were associated with more acid–base hydroxyl pairs (basic sites). The metal oxide obtained by calcining the U-LDH at 500°C had the highest catalytic performance due to the highest basicity.
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