Abstract
Mn-Al and M-Mn-Al (M = Mg, Zn, Ni, Pb, Cr) hydrotalcite-like compounds (HTlcs) were synthesized by a coprecipitation method. The hydrogenation of methyl benzoate to benzaldehyde over the calcined HTlcs was investigated. Mn 2 Al 1 catalyst calcined in N 2 gives a better performance than a conventional 10% Mn/γ-Al 2 O 3 catalyst. Incorporation of Mg 2+ , Zn 2+ , Pb 2+ , and Cr 3+ into the Mn-Al hydrotalcite-like precursor may further enhance the catalytic activity of the calcined catalysts. The conversion of methyl benzoate and selectivity to benzaldehyde on Pb 0.2 Mn 1.8 Al 1 catalyst at 370 °C are 94.4 and 84.9%, respectively. X-ray diffraction, temperature-programmed reduction, and CO 2 temperature-programmed desorption studies show that the redox and basic properties of the catalysts play an important role in the reaction.
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