Addition of Alcohols to Acrylic Compounds Catalyzed by Mg-Al LDH

作者：Teodorescu F^*; Deaconu M; Bartha E; Zavoianu R; Pavel O D

来源：Catalysis Letters, 2014, 144(1): 117-122.

DOI：10.1007/s10562-013-1108-1

• Heterogeneous catalysis
• Thermal desorption
• Alcohols
• DRIFTS
• XRD

This study reports the preparation of hydrotalcite with Mg/Al molar ratio 3 by co-precipitation under low suprasaturation conditions of Mg and Al nitrated solutions with Na2CO3 and NaOH at pH 10. The solid was thermally decomposed at 460 degrees C in air atmosphere in order to obtain mixed oxides which, by means of memory effect, can reconstruct the hydrotalcite structure by hydration with bi-distilled water. The hydrotalcite and reconstructed samples by memory effect were characterized by elemental analysis, powder XRD, DRIFT and TG-DTG. Determination of the catalysts surface base sites was made using a method based on the irreversible adsorption of organic acids with different pK(a) values and N-2 adsorption-desorption isotherms. The catalytic activity of these solids was evaluated in 1,4-addition of saturated linear alcohols to different acrylic compounds. All these reactions arose with high selectivity in the desired product. No by-products were detected by means of GC-MS chromatography and H-1 NMR.

• 出版日期2014-1