Remarkably stable and efficient Ni and Ni-Co catalysts for CO2 methanation

Alrafei, Bachar; Polaert, Isabelle; Ledoux, Alain; Azzolina-Jury, Federico

doi:10.1016/j.cattod.2019.03.026

Cited by 83 publications

(42 citation statements)

References 49 publications

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“…In this study, Ni-support interactions clearly dependent on the type of oxide support were evidenced from H 2 -TPR profiles, following the order Ni/CeO 2 < Ni/Y 2 O 3 < Ni/Al 2 O 3 (Figure 4a). The relatively weak metal-support interaction of the 15Ni/CeO 2 catalyst (Figure x) resulted in catalytic performance degradation that could depend on the vulnerability to CO-poisoning of Ni active sites [16,103]. Moreover, the valence change between Ce 3+ and Ce 4+ facilitated the direct dissociated adsorption of CO, resulting in the deposition of carbon as evinced from TEM characterization of the used catalysts, showing both encapsulating and filamentous carbon species (Figures 11a,b,c) [10].…”

Section: Correlations Between Physico-chemical Properties and Catalytic Performancementioning

confidence: 99%

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

Italiano

Llorca

Pino

et al. 2020

Applied Catalysis B: Environmental

225

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In this paper, the methanation of carbon oxides (CO and CO 2 ) was studied as an interesting way to provide a renewable energy source of synthetic natural gas (SNG) simultaneously reducing the emission of greenhouse gases. 15 wt.% Ni-based catalysts supported on CeO 2 , Al 2 O 3 and Y 2 O 3 oxides were synthesized by solution combustion synthesis. Then, a second series on Ni/Y 2 O 3 catalysts was prepared with different Ni loading (7-35 wt.%). The physicochemical properties of the catalysts were characterized by N 2 -physisorption, XRD, H 2 -TPR, CO-chemisorption, TEM, UV-Vis DRS, XPS, and CO 2 -TPD. The effect of reaction temperature (250-500°C) was investigated under atmospheric pressure, space velocity (GHSV) of 10,000 h −1 , and stoichiometric reactants ratio of (H 2 -CO 2 )/(CO+CO 2 ) = 3. A 200 h stability test was also carried out at 350°C over the 25 wt.% Ni/Y 2 O 3 catalyst. It can be concluded that the nature of Ni-support interactions played a crucial role in enhancing CO and CO 2 hydrogenation at relatively low reaction temperature. Ni/CeO 2 catalyst deactivated rapidly due to coke deposition, while the formation of NiAl 2 O 4 spinel was the main reason of the lower activity of the Al 2 O 3 -supported system. Activity data for Ni/Y 2 O 3 catalysts were closely related to the degree of Ni dispersion as well as to the medium-strength basicity. Good anti-coking and anti-sintering ability were observed after 200 h of lifetime test over the 25Ni/Y 2 O 3 catalyst.

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Section: Correlations Between Physico-chemical Properties and Catalytic Performancementioning

confidence: 99%

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

Italiano

Llorca

Pino

et al. 2020

Applied Catalysis B: Environmental

225

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“…Their best performing 10N3COMA catalyst (3% Co3O4 and 10% NiO on ordered mesoporous Al2O3) exhibited 78% CO2 conversion and 99% CH4 selectivity at 400 °C, as well as great stability upon a 60 h time on stream test, as shown in Figure 7. Alrafei et al [81] prepared Ni and NiCo catalysts with various metal loadings supported on Al 2 O 3 extrudates. According to their findings, 10% Ni and 10% Co were the most suitable metal loadings for the bimetallic catalysts.…”

Section: Promotion With Comentioning

confidence: 99%

“…Alrafei et al [ 81 ] prepared Ni and NiCo catalysts with various metal loadings supported on Al 2 O 3 extrudates. According to their findings, 10% Ni and 10% Co were the most suitable metal loadings for the bimetallic catalysts.…”

Section: Promotion With Transition Metalsmentioning

confidence: 99%

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

et al. 2020

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CO2 methanation has recently emerged as a process that targets the reduction in anthropogenic CO2 emissions, via the conversion of CO2 captured from point and mobile sources, as well as H2 produced from renewables into CH4. Ni, among the early transition metals, as well as Ru and Rh, among the noble metals, have been known to be among the most active methanation catalysts, with Ni being favoured due to its low cost and high natural abundance. However, insufficient low-temperature activity, low dispersion and reducibility, as well as nanoparticle sintering are some of the main drawbacks when using Ni-based catalysts. Such problems can be partly overcome via the introduction of a second transition metal (e.g., Fe, Co) or a noble metal (e.g., Ru, Rh, Pt, Pd and Re) in Ni-based catalysts. Through Ni-M alloy formation, or the intricate synergy between two adjacent metallic phases, new high-performing and low-cost methanation catalysts can be obtained. This review summarizes and critically discusses recent progress made in the field of bimetallic Ni-M (M = Fe, Co, Cu, Ru, Rh, Pt, Pd, Re)-based catalyst development for the CO2 methanation reaction.

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“…N2 is known as a high energetic molecule in plasma, it can store energy by vibration and rotation and thus, a part of the incident power is not used to dissociate CO2, but is consumed by N2. The catalyst 20%Ni/Al2O3 calcined at 450 °C prepared and characterized in [9] was used in the present study. A comparison between experiments made with the hollow tube, 1 g and 5 g of the catalyst is presented in Figure 7 in terms of CO2 conversion, CH4 and CH3OH production, and CH3OH /CH4 ratio.…”

Section: Resultsmentioning

confidence: 99%

“…First, the reaction was carried out without any catalyst and the effect of the CO2/H2 ratio, total flow rate and incident power were evaluated. Then, MWP was coupled with Ni catalysts that we prepared, characterized and tested on conventional CO2 methanation reaction [9]. Several configurations were studied by changing the position of the catalyst bed.…”

Section: Introductionmentioning

confidence: 99%

Synergetic effect of microwave plasma and catalysts in CO2 methanation

Alrafei

Delgado-Liriano

Ledoux

et al. 2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

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The reduction of CO2 concentration in our atmosphere consists in a big challenge for researchers, who are trying to explore novel technologies in order to transform CO2 into high added-value products. CO2 conversion into methane using microwave plasma (MWP) manifests as a very promising solution due to the ease of transport of methane and its storage. Microwave plasma represents a source of high-energy electrons, active ions and radicals that enhance or enable chemical reaction. It can be supplied by electricity generated from renewable resources. Then, MWP does not require any electrode to be generated and thus, the cost of those electrodes and of maintenance is reduced compared to glow discharge or DBD plasmas. MWP also can be generated over wide range of pressure (between 10 mbar-1bar). In addition, in the case of MWP, more electrons and active species are produced in comparison with other type of plasma[1–4]. MWP is a very suitable medium for this chemical reaction and leads to an efficient dissociation of CO2. The catalytic reduction of CO2 with H2 using MWP has been investigated in this work and the synergetic effects between the plasma and several catalysts were studied. First, the reaction was carried out without any catalysts and the effect of CO2/H2 ratio, total flow rate and input energy were evaluated. Then, a microwave generated plasma process was coupled with several Nickel catalysts that we prepared and characterized [5] in order to lead the reaction into methane formation. Multiple configurations were studied by changing the position of the catalyst bed. Obtained results were compared with conventional catalytic tests made with the same catalysts. It was found that the conversion of CO2 and energy efficiency increased using plasma assisted catalytic methanation of CO2 in comparison with conventional process. Operating conditions were studied in order to optimize methane production and energy efficiency of Plasma-catalytic process. References Qin, Y., G. Niu, X. Wang, D. Luo, Y. Duan, J. CO2 Util., 2018, 28, 283–291. De la Fuente, J.F., S.H. Moreno, A.I. Stankiewicz, G.D. Stefanidis, Int J Hydrogen Energy, 2016, 41, 21067–21077. Ashford, B., X. Tu, Curr Opin Green Sustain Chem, 2017, 3, 45–49. Vesel, A., M. Mozetic, A. Drenik, M. Balat-Pichelin, Chem Phys., 2011, 382, 127–131. Alrafei, B., I. Polaert, A. Ledoux, F. Azzolina-Jury, Catal. Today, Available online 12 March 2019, In Press, Accepted Manuscript. https://doi.org/10.1016/j.cattod.2019.03.026

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Remarkably stable and efficient Ni and Ni-Co catalysts for CO2 methanation

Cited by 83 publications

References 49 publications

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Synergetic effect of microwave plasma and catalysts in CO2 methanation

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