Dataset Information

Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO₂ Methanation under Conventional and Induction Heating.

ABSTRACT: The paper introduces spatially stable Ni-supported bimetallic catalysts for CO₂ methanation. The catalysts are a combination of sintered nickel mesh or wool fibers and nanometal particles, such as Au, Pd, Re, or Ru. The preparation involves the nickel wool or mesh forming and sintering into a stable shape and then impregnating them with metal nanoparticles generated by a silica matrix digestion method. This procedure can be scaled up for commercial use. The catalyst candidates were analyzed using SEM, XRD, and EDXRF and tested in a fixed-bed flow reactor. The best results were obtained with the Ru/Ni-wool combination, which yields nearly 100% conversion at 248 °C, with the onset of reaction at 186 °C. When we tested this catalyst under inductive heating, the highest conversion was observed already at 194 °C.

SUBMITTER: Lach D

PROVIDER: S-EPMC10002539 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO<sub>2</sub> Methanation under Conventional and Induction Heating.

Lach Daniel D Tomiczek Błażej B Siudyga Tomasz T Kapkowski Maciej M Sitko Rafał R Klimontko Joanna J Golba Sylwia S Dercz Grzegorz G Matus Krzysztof K Borek Wojciech W Polanski Jaroslaw J

International journal of molecular sciences 20230301 5

The paper introduces spatially stable Ni-supported bimetallic catalysts for CO<sub>2</sub> methanation. The catalysts are a combination of sintered nickel mesh or wool fibers and nanometal particles, such as Au, Pd, Re, or Ru. The preparation involves the nickel wool or mesh forming and sintering into a stable shape and then impregnating them with metal nanoparticles generated by a silica matrix digestion method. This procedure can be scaled up for commercial use. The catalyst candidates were an ...[more]

PMID: 36902156

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Project description:Bimetallic heterogeneous catalysts combining group 9 metals (Rh, Ir) or group 10 metals (Ni, Pd, Pt) with Mo on a silica-based support have been synthesized via surface organometallic chemistry and assessed in their catalytic activity for the hydrodeoxygenation (HDO) of alcohols with particular emphasis on the structural evolution of the catalysts and the role of Mo. The investigation was conducted with an air-free approach to isolate any sample alterations exclusively to those caused by the reaction. Structural analysis was performed using a combination of (S)TEM, IR, and XAS. It was found that Ir-Mo/SiO2, Rh-Mo/SiO2, and Pt-Mo/SiO2 display high activity for primary, secondary, and tertiary alcohol deoxygenation, while Pd-Mo/SiO2 selectively catalyses tertiary alcohol deoxygenation. Other combinations as well as the corresponding monometallic materials do not display the same activity. X-ray absorption spectroscopy confirmed metallic states for M (M = Ni, Rh, Pd, Ir, or Pt), while Mo K-edge XANES showed varying amounts of Mo(0), Mo(iv) and Mo(vi) depending on the metal counterpart in fresh materials, and indicated complete conversion of Mo(vi) to lower oxidation states (IV and 0) during the reaction. For Rh, Pd, Ir, and Pt, alloy formation (M-Mo) was identified via M-Mo paths in EXAFS and supported by CO-IR spectroscopy. In contrast to Ir, Rh, and Pt, where some Mo(0) is present at the nanoparticle surface, Pd-Mo forms an alloy but likely retains Mo in the nanoparticle core, as suggested by CO-IR spectroscopy and CO-chemisorption. Reactivity studies suggest that tertiary alcohols primarily undergo dehydration-hydrogenation, evidenced by olefin formation with MoO x /SiO2, as well as Ir/SiO2 and Ir-Mo/SiO2 under inert conditions. In contrast, primary and secondary alcohols follow a different mechanism, correlated with the presence of metallic Mo species on the nanoparticle surface, highlighting their role in C-O bond activation. These findings provide new insights into the structure-activity relationships of Mo-based bimetallic catalysts, underscoring the influence of Mo in different oxidation states and strong substrate dependence on mechanistic pathways.

Dataset Information

Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO₂ Methanation under Conventional and Induction Heating.

Publications

Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO<sub>2</sub> Methanation under Conventional and Induction Heating.

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Dataset Information

Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO2 Methanation under Conventional and Induction Heating.

Publications

Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO<sub>2</sub> Methanation under Conventional and Induction Heating.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Spatially Formed Tenacious Nickel-Supported Bimetallic Catalysts for CO₂ Methanation under Conventional and Induction Heating.