Influence of Co/Fe molar ratio on hydrotalcite catalysts prepared with or without microwave

Serhal, Cynthia Abou; Khawaja, Rebecca El; Labaki, Madona; Mallard, Isabelle; Poupin, Christophe; Cousin, Renaud; Siffert, Stéphane

doi:10.1016/j.jssc.2022.122943

Cited by 8 publications

(8 citation statements)

References 54 publications

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“…In the preparation process, compared with Ni‐Co‐oa/VSiO 2 catalyst, NiO of Ni‐Co‐im/VSiO 2 catalyst has poor dispersion on VSiO 2 support, so the particle size of Ni obtained after reduction is larger than the Ni particle size of the catalyst prepared by oleic acid method after reduction. However, for Ni‐Co‐oa/VSiO 2 and Ni‐oa/VSiO 2 catalysts, Ni‐Co‐oa/VSiO 2 has strong metal synergy as well as good dispersion and anti‐sintering properties after catalyst reduction, which is consistent with TPR and XRD analysis [38] . Therefore, Ni active components with good dispersibility and smaller particle size were obtained after the catalyst was reduced, which was consistent with TPR and XRD analysis.…”

Section: Resultssupporting

confidence: 80%

“…However, for Ni-Co-oa/VSiO 2 and Ni-oa/VSiO 2 catalysts, Ni-Co-oa/VSiO 2 has strong metal synergy as well as good dispersion and anti-sintering properties after catalyst reduction, which is consistent with TPR and XRD analysis. [38] Therefore, Ni active components with good dispersibility and smaller particle size were obtained after the catalyst was reduced, which was consistent with TPR and XRD analysis.…”

Section: Reactivity Testsupporting

confidence: 83%

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Preparation of Vermiculite‐based Molecular Sieve‐Supported Ni‐Co Alloy Catalyst Assisted by Oleic Acid and Application in Dry Reforming of Methane

et al. 2022

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In this work, microporous vermiculite-based molecular sieves were etched into mesoporous vermiculite-based molecular sieves by alkaline solution, and the mesoporous vermiculitebased molecular sieves were supported by Ni or Ni-Co alloy active components by oleic acid-assisted method and impregnation method, respectively. And prepared catalysts were applied to the dry reforming of methane (DRM) reaction. Under the reaction conditions of T = 750 °C and GHSV = 30000 mL/ (h g cat ), the conversion rate of CO 2 and CH 4 of the Ni-Co-oa/ VSiO 2 bimetallic catalyst reached 84.7 % and 71.9 %, respectively. According to the analysis of the relevant characterization results, the Ni-Co-oa/VSiO 2 catalyst has more nickel active sites and stronger interaction between metal and support due to the addition of oleic acid. Therefore, Ni-Co-oa/VSiO 2 has better catalytic reactivity and stability.

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Section: Resultssupporting

confidence: 80%

Section: Reactivity Testsupporting

confidence: 83%

Preparation of Vermiculite‐based Molecular Sieve‐Supported Ni‐Co Alloy Catalyst Assisted by Oleic Acid and Application in Dry Reforming of Methane

et al. 2022

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“…Spontaneous oxidation has been previously reported in Co(OH)2 materials with low Fe content. [26][27][28][29] The peak near 11° emerges above W5, which matches the maximum interlayer spacing prior to exfoliation. 30 Peaks near 23 and 33° grow with increased Fe-content.…”

Section: Resultsmentioning

confidence: 70%

Interplay Between Element-Specific Distortions and Electrocatalytic Oxygen Evolution for Cobalt-Iron Hydroxides

Smith,

Alsaç,

Boke

et al. 2023

Preprint

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A microscopic understanding of how Fe-doping of Co(OH)2 improves electrocatalytic oxygen evolution remains elusive. We study two Co1-xFex(OH)2 series that differ in fabrication protocol and find composition poorly alone correlates to catalyst performance. Structural descriptors extracted using X-ray diffraction, X-ray absorption spectroscopy, and Raman spectroscopy reveal element-specific distortions in Co1-xFex(OH)2. These structural descriptors are composition-dependent within individual sample series but inconsistent across fabrication protocols, revealing fabrication-dependence in catalyst microstructure. Correlations between structural parameters from different techniques show that Fe-O resists bond length changes, forcing distortion of Co environments. We find the difference in O-M-O bond angles between Co and Fe sites to correlate to the electrocatalytic behavior across both sample series. This unifying descriptor supports activation of a lattice-oxygen mechanism by decreasing O-O distance and will assist ongoing efforts to design next-generation catalysts. The fabrication dependence of microscopic catalyst structure should be considered in theoretical and high-throughput analyses of electrocatalyst materials.

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“…This is primarily caused by the fact that metal oxide mixtures have greater reduction and oxidation capacities than a single metal oxide. [21,22] In this article, a series of Mn x Mg 6-x Al 2 -O (0 � x � 6) mixed oxides synthesized via the hydrotalcite route with different Mn/ Mg ratios will be presented. The layered double hydroxides (LDH) are characterized by their high surface area, basic properties, and thermal/mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

“…When compared to using a single transitional metal oxide catalyst, utilizing multiple transitional metal oxides is frequently advantageous and results in better catalyst properties. This is primarily caused by the fact that metal oxide mixtures have greater reduction and oxidation capacities than a single metal oxide [21,22] …”

Section: Introductionmentioning

confidence: 99%

Optimization of Mn‐Mg‐Al Mixed Oxides Composition on their Activity towards the Total Oxidation of Aromatic and Oxygenated VOCs

et al. 2023

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A series of mixed oxides (Mn-Mg-Al) is prepared by coprecipitation via a hydrotalcite route with different manganese ratios. Structural, textural, and redox properties are studied by XRD, N 2 -sorption, H 2 -TPR, and XPS techniques. Mn x Mg 6-x Al 2 -O mixed oxides (with 0 � x � 6) are tested in the total oxidation of ethanol and toluene, two probe molecules representing respectively oxygenated and aromatic VOCs. Catalysts with higher manganese contents have shown the best catalytic performance for the oxidation of both ethanol and toluene. The surface activity of the materials is mainly related to the presence of manganese species in three different oxidation states (+ II, + III, and + IV) in the bulk and on the material's surface. Since high Mn-content catalysts showed similar physicochemical properties and catalytic activity, Mn 4 Mg 2 -O is selected as the optimal composition of these materials. Furthermore, its aging test is compared to that of noble metalbased commercial catalysts (Pd/γ-Al 2 O 3 ).

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Influence of Co/Fe molar ratio on hydrotalcite catalysts prepared with or without microwave

Cited by 8 publications

References 54 publications

Preparation of Vermiculite‐based Molecular Sieve‐Supported Ni‐Co Alloy Catalyst Assisted by Oleic Acid and Application in Dry Reforming of Methane

Preparation of Vermiculite‐based Molecular Sieve‐Supported Ni‐Co Alloy Catalyst Assisted by Oleic Acid and Application in Dry Reforming of Methane

Interplay Between Element-Specific Distortions and Electrocatalytic Oxygen Evolution for Cobalt-Iron Hydroxides

Optimization of Mn‐Mg‐Al Mixed Oxides Composition on their Activity towards the Total Oxidation of Aromatic and Oxygenated VOCs

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