Kinetics of CO2 methanation on a Ru-based catalyst at process conditions relevant for Power-to-Gas applications

Falbo, Leonardo; Martinelli, Michela; Visconti, Carlo Giorgio; Lietti, Luca; Bassano, Claudia; Deiana, Paolo

doi:10.1016/j.apcatb.2017.11.066

Cited by 154 publications

(142 citation statements)

References 53 publications

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“…The calculated apparent activation energies are displayed in Table 2. The activation energy for the Ni catalyst is similar to that reported in the literature for alumina-supported nickel catalysts (74 kJ mol −1 ), 20,[25][26][27] while that for the Ru monolith is slightly lower than that reported (51 vs. 73 kJ mol −1 ). The lower activation energy for the Ru catalyst suggests that the reaction is more favored over the Ru catalyst.…”

Section: Resultssupporting

confidence: 86%

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO₂ methanation

Bustinza

Frías

Liu

et al. 2020

Catal. Sci. Technol.

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Section: Resultssupporting

confidence: 86%

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO₂ methanation

Bustinza

Frías

Liu

et al. 2020

Catal. Sci. Technol.

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“…On the contrary, the presence of CeO 2 strongly promoted the reaction route towards methane, without altering the apparent activation energy. The increase of selectivity and yield to CH 4 rather than CO along with the increase in the load of CeO 2 at fixed inlet gas flow rate agrees with a reaction mechanism involving CO as reaction intermediate [9], and a CH 4 formation rate which is controlled by the conversion of CO 2 to CO [46,47] under the experimental conditions explored in this study.…”

Section: H2 + Co2 → Co + H2osupporting

confidence: 79%

Ru/Ce/Ni Metal Foams as Structured Catalysts for the Methanation of CO2

Cimino¹,

Cepollaro²,

Lisi³

et al. 2020

Catalysts

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The development of highly conductive structured catalysts with enhanced mass- and heat-transfer features is required for the intensification of the strongly exothermic catalytic hydrogenation of CO2 in which large temperature gradients should be avoided to prevent catalyst deactivation and to control selectivity. Therefore, in this work we set out to investigate the preparation of novel structured catalysts obtained from a commercial open cell Ni foam with high pore density (75 ppi) onto which a CeO2 layer was deposited via electroprecipitation, and, eventually, Ru was added by impregnation. Composite Ru/Ce/Ni foam catalysts, as well as simpler binary Ru/Ni and Ce/Ni catalysts were characterized by SEM-EDX, XRD, cyclic voltammetry, N2 physisorption, H2-temperature programmed reduction (TPR), and their CO2 methanation activity was assessed at atmospheric pressure in a fixed bed flow reactor via temperature programmed tests in the range from 200 to 450 °C. Thin porous CeO2 layers, uniformly deposited on the struts of the Ni foams, produced active catalytic sites for the hydrogenation of CO2 at the interface between the metal and the oxide. The methanation activity was further boosted by the dispersion of Ru within the pores of the CeO2 layer, whereas the direct deposition of Ru on Ni, by either impregnation or pulsed electrodeposition methods, was much less effective.

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“…It is generally agreed that hydrogenation of CO proceeds via dissociation of CO into C and O atoms followed by hydrogenation to CH4 and H2O [16,24,25]. For CO2 methanation, there are two different opinions on the nature of the mechanism:  CO2 is converted into CO prior to methanation, and direct methanation of CO2 does not take place [26][27][28][29].  CO2 is directly converted into methane without CO as intermediate [1,30].…”

Section: Reaction Mechanism Of Co and Co2 Methanationmentioning

confidence: 99%

“…• CO 2 is converted into CO prior to methanation, and direct methanation of CO 2 does not take place [26][27][28][29]. • CO 2 is directly converted into methane without CO as intermediate [1,30].…”

Section: Reaction Mechanism Of Co and Co 2 Methanationmentioning

confidence: 99%

Kinetics and Reactor Design Aspects of Selective Methanation of CO over a Ru/γ-Al2O3 Catalyst in CO2/H2 Rich Gases

2019

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Polymer electrolyte membrane fuel cells (PEMFCs) for household applications utilize H2 produced from natural gas via steam reforming followed by a water gas shift (WGS) unit. The H2-rich gas contains CO2 and small amounts of CO, which is a poison for PEMFCs. Today, CO is mostly converted by addition of O2 and preferential oxidation, but H2 is then also partly oxidized. An alternative is selective CO methanation, studied in this work. CO2 methanation is then a highly unwanted reaction, consuming additional H2. The kinetics of CO methanation in CO2/H2 rich gases were studied with a home-made Ru catalyst in a fixed bed reactor at 1 bar and 160–240 °C. Both CO and CO2 methanation can be well described by a Langmuir Hinshelwood approach. The rate of CO2 methanation is slow compared to CO. CO2 is directly converted to methane, i.e., the indirect route via reverse water gas shift (WGS) and subsequent CO methanation could be excluded by the experimental data and in combination with kinetic considerations. Pore diffusion may affect the CO conversion (>200 °C). The kinetic equations were applied to model an adiabatic fixed bed methanation reactor of a fuel cell appliance.

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Kinetics of CO2 methanation on a Ru-based catalyst at process conditions relevant for Power-to-Gas applications

Cited by 154 publications

References 53 publications

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO₂ methanation

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO₂ methanation

Ru/Ce/Ni Metal Foams as Structured Catalysts for the Methanation of CO2

Kinetics and Reactor Design Aspects of Selective Methanation of CO over a Ru/γ-Al2O3 Catalyst in CO2/H2 Rich Gases

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Kinetics of CO2 methanation on a Ru-based catalyst at process conditions relevant for Power-to-Gas applications

Cited by 154 publications

References 53 publications

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO2 methanation

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO2 methanation

Ru/Ce/Ni Metal Foams as Structured Catalysts for the Methanation of CO2

Kinetics and Reactor Design Aspects of Selective Methanation of CO over a Ru/γ-Al2O3 Catalyst in CO2/H2 Rich Gases

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Product

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Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO₂ methanation

Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO₂ methanation