Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO<sub>2</sub> Supported Ru Catalysts

Wojciechowska, Joanna; Jędrzejczyk, Marcin; Grams, Jacek; Keller, Nicolas; Ruppert, Agnieszka M.

doi:10.1002/cssc.201900236

Cited by 3 publications

(4 citation statements)

References 47 publications

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“…It has been postulated that FA decomposition to H 2 and CO 2 is promoted under basic conditions. 10,56 For example, addition of aliphatic amines and sodium or potassium formate has been used to deprotonate the carboxylic acid proton, facilitating the O-H bond cleavage, which results in the more effective preparation of the metal-formate species. [57][58][59] To evaluate the effect of different bases, sodium formate, potassium hydroxide, potassium carbonate, and triethylamine were used as a base.…”

Section: Reaction Chemistry and Engineering Papermentioning

confidence: 99%

Production of γ-valerolactone over mesoporous CuO catalysts using formic acid as the hydrogen source

et al. 2022

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Section: Reaction Chemistry and Engineering Papermentioning

confidence: 99%

Production of γ-valerolactone over mesoporous CuO catalysts using formic acid as the hydrogen source

et al. 2022

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“…The Ru/TiO2 catalyst was indeed recently reported as a very promising system capable of meeting the challenge of catalyzing both the dehydrogenation of FA to H2 and the hydrogenation of levulinic acid biomass-derived platform molecule into the high value-added g-valerolactone under similar reaction [30].…”

Section: Hcooh ® H2 + Co2mentioning

confidence: 99%

“…Preparation of the Ru/TiO2 catalyst by UV-A light photo-assisted synthesis Aeroxide® TiO2 P25 was purchased from Evonik® (Evonik Resource Efficiency GmbH, Hanau-Wolfgang, Germany). The supported photo-thermo-catalyst was prepared according to a UV-A light photo-assisted synthesis method allowing a fine control of the Ru nanoparticle size distribution [30]. Ruthenium (III) chloride hydrate (RuCl3•xH2O, 40% Ru min.…”

Section: Experimental Partmentioning

confidence: 99%

“…This work aims at studying the influence of the dual photonic (UV-A) and thermal activation of a Ru/TiO2 catalyst on its performances in the gas phase decomposition of formic acid (FA) into hydrogen, taken here as model reaction. This reaction is also of high interest, as FA is a promising H2 carrier for storage [27,28] and can be used as internal H2 source (H2 donor) for performing catalytic transfer hydrogenation reactions [29,30]. This hydrogen donormediated strategy instead of using external pressurized H2 is a step forward in the design of sustainable hydrogenation processes [31,32].…”

Section: Introductionmentioning

confidence: 99%

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UV-A light-assisted gas-phase formic acid decomposition on photo-thermo Ru/TiO2 catalyst

et al. 2021

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Although solar energy is considered as one of the ideal abundant sources of renewable energy to be integrated into catalytic processing, photonic and thermal excitations were perceived till recently as independent strategies in overcoming Arrhenius-type activation energy barriers in catalytic reactions. However, this dual-mode excitation of catalysts is receiving a growing interest nowadays due to promising evidence of synergy effects. A Ru/TiO2 photo-thermo-catalyst was prepared according to a UV-A light photo-assisted synthesis method allowing a fine control of the Ru nanoparticle size distribution, and the influence of a combined photonic (UV-A) and thermal activation on its performances in the gas phase decomposition of formic acid into hydrogen was investigated. The results showed that a dual photonic/thermal excitation in a onepot operation allows to increase the formic acid conversion and consequently the production of hydrogen vs. the reaction in the dark, the enhancement being all the more pronounced as the irradiance is high. The combined excitation allowed to drive the reaction at lower temperatures 2 upon irradiation while maintaining a similar conversion level. This low-temperature shift was all the more marked as the irradiance was high, and was accompanied by a strong increase in the selectivity to hydrogen. The change in both conversion and selectivity patterns suggested the implication of the light-excited electrons in the non-plasmonic Ru nanoparticles for conducting the reaction through an alternative low-energy transition state, with a lowering of the apparent energy activation, rather than a mechanism of localized-heat delivery.

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Solar Light Induced Photon-Assisted Synthesis of TiO2 Supported Highly Dispersed Ru Nanoparticle Catalysts

et al. 2018

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Ru/TiO2 are promising heterogeneous catalysts in different key-reactions taking place in the catalytic conversion of biomass towards fuel additives, biofuels, or biochemicals. TiO2 supported highly dispersed nanometric-size metallic Ru catalysts were prepared at room temperature via a solar light induced photon-assisted one-step synthesis in liquid phase, far smaller Ru nanoparticles with sharper size distribution being synthesized when compared to the catalysts that were prepared by impregnation with thermal reduction in hydrogen. The underlying strategy is based on the redox photoactivity of the TiO2 semi-conductor support under solar light for allowing the reduction of metal ions pre-adsorbed at the host surface by photogenerated electrons from the conduction band of the semi-conductor in order to get a fine control in terms of size distribution and dispersion, with no need of chemical reductant, final thermal treatment, or external hydrogen. Whether acetylacetonate or chloride was used as precursor, 0.6 nm sub-nanometric metallic Ru particles were synthesized on TiO2 with a sharp size distribution at a low loading of 0.5 wt.%. Using the chloride precursor was necessary for preparing Ru/TiO2 catalysts with a 0.8 nm sub-nanometric mean particle size at 5 wt.% loading, achieved in basic conditions for benefitting from the enhanced adsorption between the positively-charged chloro-complexes and the negatively-charged TiO2 surface. Remarkably, within the 0.5–5 wt.% range, the Ru content had only a slight influence on the sub-nanometric particle size distribution, thanks to the implementation of suitable photo-assisted synthesis conditions. We demonstrated further that a fine control of the metal Ru nanoparticle size on the TiO2 support was possible via a controlled nanocluster growth under irradiation, while the nanoparticles revealed a good resistance to thermal sintering.

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Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO₂ Supported Ru Catalysts

Cited by 3 publications

References 47 publications

Production of γ-valerolactone over mesoporous CuO catalysts using formic acid as the hydrogen source

Production of γ-valerolactone over mesoporous CuO catalysts using formic acid as the hydrogen source

UV-A light-assisted gas-phase formic acid decomposition on photo-thermo Ru/TiO2 catalyst

Solar Light Induced Photon-Assisted Synthesis of TiO2 Supported Highly Dispersed Ru Nanoparticle Catalysts

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Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO2 Supported Ru Catalysts

Cited by 3 publications

References 47 publications

Production of γ-valerolactone over mesoporous CuO catalysts using formic acid as the hydrogen source

Production of γ-valerolactone over mesoporous CuO catalysts using formic acid as the hydrogen source

UV-A light-assisted gas-phase formic acid decomposition on photo-thermo Ru/TiO2 catalyst

Solar Light Induced Photon-Assisted Synthesis of TiO2 Supported Highly Dispersed Ru Nanoparticle Catalysts

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Enhanced Production of γ‐Valerolactone with an Internal Source of Hydrogen on Ca‐Modified TiO₂ Supported Ru Catalysts