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The impact of the „memory effect” on the catalytic activity of Mg/Al; Mg,Zn/Al; Mg/Al,Ga hydrotalcite-like compounds used as catalysts for cycloxene epoxidation

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: E. Angelescu, O.D. Pavel, R. Bîrjega, M. Florea, R. Zãvoianu

Editorial: Applied catalysis A:General, 341, p.50-57, 2008.

Rezumat:

The epoxidation of cyclohexene by hydrogene peroxide and benzonitrile, in methanol as solvent on solid base catalysts, hydrotalcites (HT) and corresponding mixed oxides (C-HT) was investigated. The employed catalysts were as-synthesized Mg/Al; Mg,Zn/Al; Mg/Ga,Al hydrotalcites, their derived mixed oxides and the corresponding reconstructed hydrotalcite forms (R-HT) obtained via the “memory effect” upon a rehydration treatment of C-HT. The catalysts were characterized by XRD, CO2-TPD and N2 adsorption–desorption measurements.

The reconstructed HT samples exhibit higher activity in comparison to the as-synthesized carbonated HT samples. A tentative correlation of the catalytic properties with the base strength of the active sites, the structural and textural characteristics of the catalysts, has been explored.

Cuvinte cheie: Epoxidation of cyclohexene; Hydrotalcites and mixed oxides catalysts; Memory effect

URL: http://www.sciencedirect.com.ux4ll8xu6v.useaccesscontrol.com/science/article/pii/S0926860X07007430