Abstract
A series of MgMnTi hydrotalcite-like layered double hydroxides (LDH) with different atomic ratios were prepared by a one-step co-precipitation method as catalysts for the solvent-free oxidation of alcohols. The influence of the metallic molar ratio on the catalytic performance was investigated in benzyl alcohol oxidation. The activity of the MgxMn2Tiy–LDH catalysts was demonstrated to be related not only to the percentage of Mn4+ species, which facilitate β-H fracture, but also to the proportion of Mn3+ species, which decrease oxygen mobility. Furthermore, the induction effect of Ti4+OH species on π-electrons was revealed to promote the activation of benzyl alcohol. Significantly, the apparent activation energy of as-synthesized Mg4Mn2Ti1.0–LDH catalyst was comparable to that of some noble metal catalysts. Further, Mg4Mn2Ti1.0–LDH catalyst was found to selectively oxidize various alcohols to the corresponding aldehydes and ketones with respectable activity, except for the saturated alcohols.
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