Among the different types of basic oxides studied, hydrotalcites (HT) have been reported as promising catalysts for the fine–chemicals industry. The known methods of HT synthesis demand complex equipment, include time-consuming stages of precipitation, washing and drying and cause ecological problems due to the contamination of waste water with environmentally unfriendly ions.

The new route for Al-Mg oxides synthesis on the basis of Mg and Al organic salts is presented in this communication. Mixed Al-Mg oxides were synthesized by thermal decomposition (600^oC) of Al- and Mg- nitrates in presence of citric acid (citrate method) and Al- and Mg- formates (formate method). The HT sample prepared by traditional co-precipitation method was used for a reference. The prepared Al-Mg oxide samples possess mesoporous structure with different pore-size distribution (determined by nitrogen adsorption method).

The hydration of Al-Mg oxides by its immersion in water have been performed to obtain HT samples. The formation of high ordered HT lamellar structure was confirmed by XRD analysis.

Significant decreasing of surface area (S_BET) was observed for the reconstructed HT samples. The applying of the ultrasonic treatment under hydration of the Al-Mg mixed oxides has resulted in increasing of S_BET to 220 m²/g which one is comparable with S_BET values for starting mixed oxides.

The catalytic activity of prepared samples was tested in the thermo programmed reaction of 2-methyl-3-butyn-2-ol decomposition with evaluation of acetone and acetylene. Among all the samples tested, HT prepared by hydration of mixed oxides with ultrasonic treatment shows the higher catalytic activity in this reaction.

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