6533b7d2fe1ef96bd125e223
RESEARCH PRODUCT
Unlocking mixed oxides with unprecedented stoichiometries from heterometallic metalorganic frameworks for the catalytic hydrogenation of CO 2
Pierre BordetCarlos Martí-gastaldoSamy Ould-chikhRafia AhmadNatalia M. PadialLuigi CavalloAntonio Aguilar-tapiaJavier Castells-gilAdrian RamirezJorge GasconLingmei LiuAlberto Rodriguez GomezGonzalo PrietoAlessandro GenoveseSelvedin TelalovicLuis Garzón-tovarsubject
titanomaghemiteMaterials scienceRWGSNanoparticle02 engineering and technology010402 general chemistry01 natural sciencesReverse water-gas shiftWater-gas shift reactionMixed oxidesCatalysisTitanomaghemitePhase (matter)[CHIM.CRIS]Chemical Sciences/CristallographyPhysical and Theoretical Chemistrymixed oxidesOrganic ChemistryThermal decomposition[CHIM.MATE]Chemical Sciences/Material chemistry[CHIM.CATA]Chemical Sciences/Catalysis021001 nanoscience & nanotechnology0104 chemical sciencesChemical engineeringChemistry (miscellaneous)reverse water-gas shiftMetal-organic framework0210 nano-technologySelectivityMOF-mediated synthesisStoichiometrydescription
[EN] 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-01 |