Unlocking mixed oxides with unprecedented stoichiometries from heterometallic metal-organic frameworks for the catalytic hydrogenation of CO2
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Date
2021-07-15
Publication Type
Journal Article
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Abstract
Their complex surface chemistry and high oxygen lattice mobilities place mixed-metal oxides among the most important families of materials. Modulation of stoichiometry in mixed-metal oxides has been shown to be a very powerful tool for tuning optical and catalytic properties. However, accessing different stoichiometries is not always synthetically possible. Here, we show that the thermal decomposition of the recently reported metal-organic framework MUV-101(Fe, Ti) results in the formation of carbon-supported titanomaghemite nanoparticles with an unprecedented Fe/Ti ratio close to 2, not achievable by soft-chemistry routes. The resulting titanomaghemite phase displays outstanding catalytic activity for the production of CO from CO2 via the reverse water-gas shift (RWGS) reaction with CO selectivity values of ca. 100% and no signs of deactivation after several days on stream. Theoretical calculations suggest that the reaction proceeds through the formation of COOH∗ species, favoring in this way CO over other byproducts.
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published
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Journal / series
Volume
1 (2)
Pages / Article No.
364 - 382
Publisher
Cell Press
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Subject
titanomaghemite; reverse water-gas shift; RWGS; MOF-mediated synthesis; mixed oxides
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02293 - Catalysis Hub / Catalysis Hub