Unlocking mixed oxides with unprecedented stoichiometries from heterometallic metal-organic frameworks for the catalytic hydrogenation of CO2
Gómez, Alberto Rodríguez
Garzon Tovar, Luis Carlos
Padial, Natalia M.
KAUST DepartmentKAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
King Abdullah University of Science and Technology, KAUST Catalysis Center, Advanced Functional Materials, Thuwal 23955, Saudi Arabia.
Advanced Membranes and Porous Materials Research Center
Chemical Science Program
Chemical Engineering Program
Embargo End Date2023-04-26
Permanent link to this recordhttp://hdl.handle.net/10754/669061
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AbstractTheir 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.
CitationCastells-Gil, J., Ould-Chikh, S., Ramírez, A., Ahmad, R., Prieto, G., Gómez, A. R., … Gascon, J. (2021). Unlocking mixed oxides with unprecedented stoichiometries from heterometallic metal-organic frameworks for the catalytic hydrogenation of CO2. Chem Catalysis. doi:10.1016/j.checat.2021.03.010
SponsorsDaliang Zhang is acknowledged for his help with Digital Micrograph scripts used to acquire image stacks during our in situ TEM experiments. This work was supported by the European Union (ERC Stg Chem-fs-MOF 714122) and the Spanish government (CTQ2017-83486-P and CEX2019-000919-M). N.M.P. thanks the European Union for a Marie Skłodowska-Curie Global Fellowship (H2020-MSCA-IF-2016-GF-749359-EnanSET).