EFFECT OF REHYDRATION CONDITIONS ON THE CATALYTIC ACTIVITY OF HYDROTALCITE-DERIVED Mg-Al OXIDES IN ALDOLIZATION OF ACETONE

摘要

Mg-Al hydrotalcite-derived oxides with a varying Mg/Al molar ratio,ranging from 2.6 to 3.2,were rehydrated in the vapor phase at different temperatures(20-90deg C).The catalytic performance of the materials obtained was studied in the aldol condensation of acetone.The initial activity of the rehydrated catalysts depended strongly on the Mg/Al molar ratio and the activation temperature.It was found that the re-arrangement of active sites,leading to the reconstruction of hydrotalcite-like phase,occurred during the catalytic test.