Activity of heterogeneous supported Cu and Ru catalysts in acceptor-less alcohol dehydrogenation

Kaźmierczak, Kamila; Aliyu, Shamsudin; Pinel, Catherine; Бессон, М.; Michel, Carine; Perret, Noémie

doi:10.1016/j.catcom.2020.106179

Cited by 17 publications

(14 citation statements)

References 31 publications

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“…These compounds originate from aldol condensation and further hydrogenation processes. 49,50 This also explains why the octan-1-ol conversion (55 %) is much higher than the yield of H 2 (29 % after 24 h, see Figure 9a); with an acceptorless mechanism, two similar values are expected. To explain our results, it is assumed that H 2 generated by dehydrogenation of alcohols is next used to hydrogenate aldol condensation products following a reaction pathway that has been proposed previously with Cu/ZrO 2 catalyst.…”

Section: Catalytic Acceptorless Dehydrogenation Of Alcoholsmentioning

confidence: 65%

“…Very interestingly, unsupported Co 50 Ru 50 nanoalloys are found to be much more active than heterogeneous catalysts corresponding to Co, or Ru supported on various supports tested under identical conditions. 49,50 An octan-1-ol conversion of 55 % was found after 24 h at 145 °C for the nanoalloys, to be compared to 10 % obtained with Co/TiO 2 49 or 8 % with Ru/TiO 2 , 50 tested under the same conditions.…”

Section: Catalytic Acceptorless Dehydrogenation Of Alcoholsmentioning

confidence: 98%

“…To explain our results, it is assumed that H 2 generated by dehydrogenation of alcohols is next used to hydrogenate aldol condensation products following a reaction pathway that has been proposed previously with Cu/ZrO 2 catalyst. 50 The evolution of the selectivity as a function of the octan-1-ol conversion is presented in Figure 9b. One can see that the selectivity to octanal decreases when the conversion increases.…”

Section: Catalytic Acceptorless Dehydrogenation Of Alcoholsmentioning

confidence: 99%

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Facile soft-chemistry synthesis of Co-Ru nanoalloys: influence of the composition on the catalytic activity for the acceptorless dehydrogenation of alcohols.

Azeredo

Ghzaiel

Huang

et al. 2022

Preprint

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The synthesis of Co-Ru bimetallic nanoparticles was performed by co-reduction of Co(II) and Ru(III) salts in octan-1-ol, acting both as a solvent and a mild reducing agent. The metal composition was varied in the entire range, from pure Co to pure Ru. Although Co and Ru are miscible in the bulk, the formation of nanoalloys is not straightforward and requires selecting carefully reaction parameters such as the nature of the solvent and that of the metal precursors. The formation of nanoalloys was unambiguously evidenced by HAADF STEM–EDX analyses. The particle size and the size dispersity were found to decrease with increasing Ru amount, yielding very small and monodisperse particles for the richest compositions in Ru. The unsupported particles were tested for the acceptorless alcohol dehydrogenation using (±)-octan-2-ol and octan-1-ol as model substrates. The results clearly show a synergetic effect since the bimetallic particles exhibit better performances than their monometallic counterparts.

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Section: Catalytic Acceptorless Dehydrogenation Of Alcoholsmentioning

confidence: 65%

Section: Catalytic Acceptorless Dehydrogenation Of Alcoholsmentioning

confidence: 98%

Section: Catalytic Acceptorless Dehydrogenation Of Alcoholsmentioning

confidence: 99%

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Facile soft-chemistry synthesis of Co-Ru nanoalloys: influence of the composition on the catalytic activity for the acceptorless dehydrogenation of alcohols.

Azeredo

Ghzaiel

Huang

et al. 2022

Preprint

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“…Here, we focus on the example of Co and Cu, two abundant 3d transition metals featuring very different properties, and recently demonstrated to be active in the AAD reaction. 30,[43][44][45][46]29,47,48 Co is a reactive d 7 weaker affinity due to its s 1 d 10 electron configuration. Recently, combined experimental and density functional theory (DFT) studies demonstrated that the Cu(211) surface was more active than the Cu(111) close-packed surface to perform the gas-phase dehydrogenation of ethanol.…”

Section: ■ Introductionmentioning

confidence: 99%

Designing Active Sites for Structure-Sensitive Reactions via the Generalized Coordination Number: Application to Alcohol Dehydrogenation

et al. 2021

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Identifying the structure of the most active site is essential to improve the performance of supported metal catalysts. For structure-sensitive reactions, in silico design cannot be easily achieved combining the scaling relations and Brønsted−Evans −Polanyi relations, which are only built on energy-based descriptors. We used here the generalized coordination number as a structural descriptor and established that low-coordinated sites are desirable when using Co and Cu to perform the acceptor-less alcohol dehydrogenation reaction.

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“…More favorable cleavage of the C C bond under alkaline conditions is due to the fact that OH species readily accept a proton, which promotes the dehydrogenation of ethanol. 7,8 Other advantages of alkaline alcohol fuel cells include the possibility of using base metal catalysts, [9][10][11][12][13] as well as the absence of a membrane in them. 14 This not only ensures their greater variability in relation to fuel and oxidizer, but also significantly reduces their weight and size.…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity of platinized titanium and titanium coated with ruthenium oxide in the processes of electrooxidation of ethyl alcohol in alkaline media

Таранцева

Politaeva

Таранцев

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: This study investigates the catalytic activity of platinized titanium and titanium coated with ruthenium oxide in the processes of electrooxidation of ethyl alcohol in alkaline phosphate electrolyte and potassium hydroxide electrolyte in nonflowing membraneless fuel cells proposed by the authors. In these systems, an interface between the phases formed, which played the role of a membrane. Cyclic voltammetry, pulse chronoamperometry and gas-liquid chromatography were used to study the corrosion resistance and catalytic activity of ethanol oxidation on the selected electrodes. Platinized titanium and titanium coated with ruthenium oxide, involving a thin layer of platinum or ruthenium oxide on a perforated titanium mesh, were investigated. RESULTS: It is found that the oxidation of ethyl alcohol proceeds more actively on the surface of titanium coated with ruthenium oxide in alkaline phosphate electrolyte, with the formation of acetaldehyde as the main reaction product. In potassium hydroxide electrolyte, acetaldehyde and acetic acid are formed on the surface; two and four electrons are released, respectively. This indicates the C2 reaction pathway of ethanol oxidation. In contrast, the oxidation of ethyl alcohol in potassium hydroxide electrolyte proceeds more actively on the platinized titanium with the formation of acetaldehyde. CONCLUSIONS:The results obtained show that titanium electrode coated with ruthenium oxide is promising in phosphate electrolyte, but platinized titanium electrode is promising in potassium hydroxide electrolyte in the proposed non-flowing membraneless alcohol fuel cells.

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Activity of heterogeneous supported Cu and Ru catalysts in acceptor-less alcohol dehydrogenation

Cited by 17 publications

References 31 publications

Facile soft-chemistry synthesis of Co-Ru nanoalloys: influence of the composition on the catalytic activity for the acceptorless dehydrogenation of alcohols.

Facile soft-chemistry synthesis of Co-Ru nanoalloys: influence of the composition on the catalytic activity for the acceptorless dehydrogenation of alcohols.

Designing Active Sites for Structure-Sensitive Reactions via the Generalized Coordination Number: Application to Alcohol Dehydrogenation

Catalytic activity of platinized titanium and titanium coated with ruthenium oxide in the processes of electrooxidation of ethyl alcohol in alkaline media

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