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Unlocking mixed oxides with unprecedented stoichiometries from heterometallic metalorganic frameworks for the catalytic hydrogenation of CO 2

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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https://hal.archives-ouvertes.fr/hal-03363698
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Soumis le : jeudi 14 octobre 2021 - 12:16:44
Dernière modification le : mardi 19 octobre 2021 - 11:23:13

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NEEL | UGA | CNRS

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Javier Castells-Gil, Samy Ould-Chikh, Adrian Ramírez, Rafia Ahmad, Gonzalo Prieto, et al.. Unlocking mixed oxides with unprecedented stoichiometries from heterometallic metalorganic frameworks for the catalytic hydrogenation of CO 2. Chem Catalysis, Elsevier, 2021, 1 (2), pp.364-382. ⟨10.1016/j.checat.2021.03.010⟩. ⟨hal-03363698⟩

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