Synthesis of α,β-unsaturated ketones over thermally activated Mg–Al hydrotalcites
作者： J.I. Di Cosimo , V.K. Dı́ez , C.R. Apesteguı́a
DOI: 10.1016/S0169-1317(98)00037-4
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摘要: Abstract The synthesis of α,β-unsaturated ketones on hydrotalcite-derived Mg–Al mixed oxides was studied. Five samples with ratios 0.5–9.0 were prepared by coprecipitation and characterized infrared spectroscopy, CO2 chemisorption X-ray photoelectron spectroscopy. selectivity to [mesityl oxide (MO), isomesityl (IMO), isophorone (IP)] pure MgO calcined hydrotalcites practically 100%. Magnesium contained both the highest basic site density strongest sites; as a result, it exhibited high activity for acetone oligomerization reactions. addition small amounts Al (Mg/Al>5) diminished drastically surface sites because significant enrichment, caused catalytic drop. At higher content (1
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