RuOx domains present as isolated RuO42- structures on ZrO2 catalyze the selective oxidation of methanol to methyl formate at low temperatures, e.g. 373 K.  The molecular RuO42- structrures of the species change from umbrella-like dioxo (O=)2Ru(OH)-O-Zr with a Ru-OH bond into tetrahedral dioxo (O=)2Ru-(O-Zr)2 by increasing the treatment temperatures from 673 to 773 K, and then into pyramidic mono-oxo O=Ru-(O-Zr)4 above 1173 K, due to the stronger interaction between RuOx species and ZrO2 surface at the higher temperatures.  Such structural changes lead to a parallel increase in the reducibility of the RuO42- species and their methanol oxidation states.

Active structure of RuO<sub>x</sub>/ZrO<sub>2</sub> catalysts for selective oxidation of methanol to methyl formate

243rd National Meeting (2012)

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Active structure of RuOx/ZrO2 catalysts for selective oxidation of methanol to methyl formate

Active structure of RuO_x/ZrO₂ catalysts for selective oxidation of methanol to methyl formate