Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation

Formic acid (FA) possesses a high volumetric concentration of H<sub>2</sub> (53 g L<sup>−1</sup>). Moreover, it can be easily prepared, stored, and transported. Therefore, FA stands out as a potential liquid organic hydrogen carrier (LOHC), which allows storage and transporta...

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Autores principales: Manuel Iglesias, Francisco J. Fernández-Alvarez
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Publicado: MDPI AG 2021
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spelling oai:doaj.org-article:5c937fb40e0e4d1f9318e507742f15dd2021-11-25T17:05:28ZAdvances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation10.3390/catal111112882073-4344https://doaj.org/article/5c937fb40e0e4d1f9318e507742f15dd2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1288https://doaj.org/toc/2073-4344Formic acid (FA) possesses a high volumetric concentration of H<sub>2</sub> (53 g L<sup>−1</sup>). Moreover, it can be easily prepared, stored, and transported. Therefore, FA stands out as a potential liquid organic hydrogen carrier (LOHC), which allows storage and transportation of hydrogen in a safe way. The dehydrogenation to produce H<sub>2</sub> and CO<sub>2</sub> competes with its dehydration to give CO and H<sub>2</sub>O. For this reason, research on selective catalytic FA dehydrogenation has gained attention in recent years. Several examples of highly active homogenous catalysts based on precious metals effective for the selective dehydrogenation of FA have been reported. Among them are the binuclear iridium-bipyridine catalysts described by Fujita and Himeda et al. (TOF = 228,000 h<sup>−1</sup>) and the cationic species [IrClCp*(2,2′-bi-2-imidazoline)]Cl (TOF = 487,500 h<sup>−1</sup>). However, examples of catalytic systems effective for the solventless dehydrogenation of FA, which is of great interest since it allows to reduce the reaction volume and avoids the use of organic solvents that could damage the fuel cell, are scarce. In this context, the development of transition metal catalysts based on cheap and easily available nonprecious metals is a subject of great interest. This work contains a summary on the state of the art of catalytic dehydrogenation of FA in homogeneous phase, together with an account of the catalytic systems based on non-precious metals so far reported.Manuel IglesiasFrancisco J. Fernández-AlvarezMDPI AGarticlehomogeneous catalysisformic acid dehydrogenationnonprecious metalsliquid hydrogen carriersChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1288, p 1288 (2021)
institution DOAJ
collection DOAJ
language EN
topic homogeneous catalysis
formic acid dehydrogenation
nonprecious metals
liquid hydrogen carriers
Chemical technology
TP1-1185
Chemistry
QD1-999
spellingShingle homogeneous catalysis
formic acid dehydrogenation
nonprecious metals
liquid hydrogen carriers
Chemical technology
TP1-1185
Chemistry
QD1-999
Manuel Iglesias
Francisco J. Fernández-Alvarez
Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation
description Formic acid (FA) possesses a high volumetric concentration of H<sub>2</sub> (53 g L<sup>−1</sup>). Moreover, it can be easily prepared, stored, and transported. Therefore, FA stands out as a potential liquid organic hydrogen carrier (LOHC), which allows storage and transportation of hydrogen in a safe way. The dehydrogenation to produce H<sub>2</sub> and CO<sub>2</sub> competes with its dehydration to give CO and H<sub>2</sub>O. For this reason, research on selective catalytic FA dehydrogenation has gained attention in recent years. Several examples of highly active homogenous catalysts based on precious metals effective for the selective dehydrogenation of FA have been reported. Among them are the binuclear iridium-bipyridine catalysts described by Fujita and Himeda et al. (TOF = 228,000 h<sup>−1</sup>) and the cationic species [IrClCp*(2,2′-bi-2-imidazoline)]Cl (TOF = 487,500 h<sup>−1</sup>). However, examples of catalytic systems effective for the solventless dehydrogenation of FA, which is of great interest since it allows to reduce the reaction volume and avoids the use of organic solvents that could damage the fuel cell, are scarce. In this context, the development of transition metal catalysts based on cheap and easily available nonprecious metals is a subject of great interest. This work contains a summary on the state of the art of catalytic dehydrogenation of FA in homogeneous phase, together with an account of the catalytic systems based on non-precious metals so far reported.
format article
author Manuel Iglesias
Francisco J. Fernández-Alvarez
author_facet Manuel Iglesias
Francisco J. Fernández-Alvarez
author_sort Manuel Iglesias
title Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation
title_short Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation
title_full Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation
title_fullStr Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation
title_full_unstemmed Advances in Nonprecious Metal Homogeneously Catalyzed Formic Acid Dehydrogenation
title_sort advances in nonprecious metal homogeneously catalyzed formic acid dehydrogenation
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/5c937fb40e0e4d1f9318e507742f15dd
work_keys_str_mv AT manueliglesias advancesinnonpreciousmetalhomogeneouslycatalyzedformicaciddehydrogenation
AT franciscojfernandezalvarez advancesinnonpreciousmetalhomogeneouslycatalyzedformicaciddehydrogenation
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