Base-Free Catalytic Hydrogen Production from Formic Acid Mediated by a Cubane-Type Mo3S4 Cluster Hydride
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Other documents of the author: Guillamón, Eva; Sorribes, Iván; Safont Villarreal, Vicent Sixte; Algarra, Andrés G.; Fernández-Trujillo, M. Jesús; Pedrajas Gual, Elena; Llusar, Rosa; García Basallote, Manuel
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Title
Base-Free Catalytic Hydrogen Production from Formic Acid Mediated by a Cubane-Type Mo3S4 Cluster HydrideAuthor (s)
Date
2022-10-14Publisher
American Chemical SocietyBibliographic citation
GUILLAMÓN, Eva, et al. Base-Free Catalytic Hydrogen Production from Formic Acid Mediated by a Cubane-Type Mo3S4 Cluster Hydride. Inorganic Chemistry, 2022, vol. 61, no 42, p. 16730-16739.Type
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Abstract
Formic acid (FA) dehydrogenation is an attractive process in the implementation of a hydrogen economy. To make this process greener and less costly, the interest nowadays is moving toward non-noble metal catalysts and ... [+]
Formic acid (FA) dehydrogenation is an attractive process in the implementation of a hydrogen economy. To make this process greener and less costly, the interest nowadays is moving toward non-noble metal catalysts and additive-free protocols. Efficient protocols using earth abundant first row transition metals, mostly iron, have been developed, but other metals, such as molybdenum, remain practically unexplored. Herein, we present the transformation of FA to form H2 and CO2 through a cluster catalysis mechanism mediated by a cuboidal [Mo3S4H3(dmpe)3]+ hydride cluster in the absence of base or any other additive. Our catalyst has proved to be more active and selective than the other molybdenum compounds reported to date for this purpose. Kinetic studies, reaction monitoring, and isolation of the [Mo3S4(OCHO)3(dmpe)3]+ formate reaction intermediate, in combination with DFT calculations, have allowed us to formulate an unambiguous mechanism of FA dehydrogenation. Kinetic studies indicate that the reaction at temperatures up to 60 °C ends at the triformate complex and occurs in a single kinetic step, which can be interpreted in terms of statistical kinetics at the three metal centers. The process starts with the formation of a dihydrogen-bonded species with Mo–H···HOOCH bonds, detected by NMR techniques, followed by hydrogen release and formate coordination. Whereas this process is favored at temperatures up to 60 °C, the subsequent β-hydride elimination that allows for the CO2 release and closes the catalytic cycle is only completed at higher temperatures. The cycle also operates starting from the [Mo3S4(OCHO)3(dmpe)3]+ formate intermediate, again with preservation of the cluster integrity, which adds our proposal to the list of the infrequent cluster catalysis reaction mechanisms. [-]
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Inorganic Chemistry, 2022, vol. 61, no 42Funder Name
Ministerio de Ciencia, Innovación y Universidades (Spain) | Universitat Jaume I | Generalitat Valenciana | Junta de Andalucía | 2014-2020 ERDF Operational Program
Project code
PGC2018-094417-BI00 | PID2019-107006GB-C22 | UJI-B2021-29 | UJI-B2019-30 | SEJI/ 2020/018 | UJI-A2019-16 | FEDER-UCA18-106840
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Copyright © 2022 American Chemical Society
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