A study of the methanation of carbon dioxide on Ni/Al2O3 catalysts at atmospheric pressure

Garbarino, Gabriella; Riani, Paola; Magistri, Loredana; Busca, Guido

doi:10.1016/j.ijhydene.2014.05.111

Cited by 236 publications

(155 citation statements)

References 44 publications

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“…Consistent with these results, situations near chemical equilibrium can be achieved on M/Al2O3 (M = Ni [18][19] or Ru [19]) only at temperatures above 400 °C, although unfortunately, conversions and selectivities to methane decline under such conditions. As mentioned above, lower temperatures are more favourable, and in this regard, striking improvements (100% conversion, 100% selectivity to CH4, 180 °C) by using TiO2-supported ruthenium catalysts prepared by a sputtering method have been claimed [20].…”

Section: Catalytic Hydrogenation Of Cofor the Production Of Fuelssupporting

confidence: 64%

Light-Promoted Hydrogenation of Carbon Dioxide—An Overview

Puga

2016

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Section: Catalytic Hydrogenation Of Cofor the Production Of Fuelssupporting

confidence: 64%

Light-Promoted Hydrogenation of Carbon Dioxide—An Overview

Puga

2016

Top Catal

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“…Figure S2), confirming the uniform particle size and the absence of agglomerates or larger particles. Furthermore, the Ni particles were reduced at lower temperature compared to other Ni/Al 2 O 3 catalysts reported in the literature (peak maxima between 680 and 800 • C [39][40][41]), which suggests a weaker metal-support interaction in the catalyst prepared in this study due to the synthesis method.…”

Section: Preparation Characterization and Catalytic Performancementioning

confidence: 45%

Surface Oxidation of Supported Ni Particles and Its Impact on the Catalytic Performance during Dynamically Operated Methanation of CO2

et al. 2017

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Abstract:The methanation of CO 2 within the power-to-gas concept was investigated under fluctuating reaction conditions to gather detailed insight into the structural dynamics of the catalyst. A 10 wt % Ni/Al 2 O 3 catalyst with uniform 3.7 nm metal particles and a dispersion of 21% suitable to investigate structural changes also in a surface-sensitive way was prepared and characterized in detail. Operando quick-scanning X-ray absorption spectroscopy (XAS/QEXAFS) studies were performed to analyze the influence of 30 s and 300 s H 2 interruptions during the methanation of CO 2 in the presence of O 2 impurities (technical CO 2 ). These conditions represent the fluctuating supply of H 2 from renewable energies for the decentralized methanation. Short-term H 2 interruptions led to oxidation of the most reactive low-coordinated metallic Ni sites, which could not be re-reduced fully during the subsequent methanation cycle and accordingly caused deactivation. Detailed evaluation of the extended X-ray absorption fine structure (EXAFS) spectra showed surface oxidation/reduction processes, whereas the core of the Ni particles remained reduced. The 300-s H 2 interruptions resulted in bulk oxidation already after the first cycle and a more pronounced deactivation. These results clearly show the importance and opportunities of investigating the structural dynamics of catalysts to identify their mechanism, especially in power-to-chemicals processes using renewable H 2 .

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“…In [93] a study on the methane yield as a function of different Ni-based compositions and reaction temperatures (250-500 • C) is reported. The data suggest that good performance is obtained at the expense of a CO intermediate on the corners of nanoparticles interacting with alumina, likely via an oxygenate mechanism.…”

Section: Alumina-supported Nickelmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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CO 2 methanation is a well-known reaction that is of interest as a capture and storage (CCS) process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas (SNG) production. Integrating water electrolysis and CO 2 methanation is a highly effective way to store energy produced by renewables sources. The conversion of electricity into methane takes place via two steps: hydrogen is produced by electrolysis and converted to methane by CO 2 methanation. The effectiveness and efficiency of power-to-gas plants strongly depend on the CO 2 methanation process. For this reason, research on CO 2 methanation has intensified over the last 10 years. The rise of active, selective, and stable catalysts is the core of the CO 2 methanation process. Novel, heterogeneous catalysts have been tested and tuned such that the CO 2 methanation process increases their productivity. The present work aims to give a critical overview of CO 2 methanation catalyst production and research carried out in the last 50 years. The fundamentals of reaction mechanism, catalyst deactivation, and catalyst promoters, as well as a discussion of current and future developments in CO 2 methanation, are also included.

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A study of the methanation of carbon dioxide on Ni/Al2O3 catalysts at atmospheric pressure

Cited by 236 publications

References 44 publications

Light-Promoted Hydrogenation of Carbon Dioxide—An Overview

Light-Promoted Hydrogenation of Carbon Dioxide—An Overview

Surface Oxidation of Supported Ni Particles and Its Impact on the Catalytic Performance during Dynamically Operated Methanation of CO2

Supported Catalysts for CO2 Methanation: A Review

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