Techno-economic modelling of a Power-to-Gas system based on SOEC electrolysis and CO2 methanation in a RES-based electric grid

Salomone, Fabio; Giglio, Emanuele; Ferrero, Domenico; Santarelli, Massimo; Pirone, Raffaele; Bensaid, Samir

doi:10.1016/j.cej.2018.10.170

Cited by 112 publications

(51 citation statements)

References 47 publications

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“…These processes are more mature than electrochemical production of carbon monoxide or formate and, despite requiring high temperature and pressure, can support high energetic efficiencies (Figure 4). For example, production of methane 56,57 and methanol 58,59 using this approach can already reach an overall energetic efficiency higher than 50%, surpassing even 70% using emerging technologies [60][61][62] . Despite the early stage, hydrogenation of CO2 to formate has gained considerable attention in recent years and may prove an effective approach 63,64 .…”

Section: Direct and Indirect Electrochemical Production Of Electron Cmentioning

confidence: 99%

“…Powerto-gas technologies enable the production of methane from electricity with an overall energetic efficiency of ~55% 57,58 . Heat integration or coupling with high-temperature electrolysis can further increase this efficiency to well above 70% [60][61][62] . Similarly, production of methanol from electricity can already reach an energetic efficiency higher than 50% 58,59 .…”

Section: Figurementioning

confidence: 99%

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Making quantitative sense of electromicrobial production

et al. 2019

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The integration of electrochemical and microbial processes offers a unique opportunity to displace fossil carbon with CO2 and renewable energy as the primary feedstocks for carbon-based chemicals. Yet, it is unclear which strategy for CO2 activation and electron transfer to microbes has the capacity to transform the chemical industry. Here, we systematically survey experimental data for microbial growth on compounds that can be produced electrochemically, either directly or indirectly. We show that only a few strategies can support efficient electromicrobial production, where formate and methanol seem the best electron mediators in terms of energetic efficiency of feedstock bio-conversion under both anaerobic and aerobic conditions. We further show that direct attachment of microbes to the cathode is highly constrained due to an inherent discrepancy between the rates of the electrochemical and biological processes. Our quantitative perspective provides a data-driven roadmap towards economically and environmentally viable realization of electromicrobial production.

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Section: Direct and Indirect Electrochemical Production Of Electron Cmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Making quantitative sense of electromicrobial production

et al. 2019

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“…The disadvantage is the higher investment in equipment. In order to design a technically and economically advantageous solution, the current or feasible possibilities must be weighed in the near future for the use of CH4 and H2 (Salomone et al, 2018).…”

Section: Integration Perspectives In Energy Systemsmentioning

confidence: 99%

Comparative analysis of carbon dioxide methanation technologies for low carbon society development

Lăzăroiu¹,

Ciupăgeanu²,

Mihăescu³

et al. 2020

Proceedings of the 8th International Conference on Advanced Materials and Systems

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Conversion technologies able to transform renewable energy sources (RES) based electricity in gaseous fuels, which can be stored over long timeframes, represent a key focus point considering the low carbon society development. Thus, Power-to-Gas technologies emerge as a viable solution to mitigate the variability of RES power generation, enabling spatial and temporal balancing of production vs. demand mismatches. An additional benefit in this context is brought by the decarbonization facilities, employing polluting carbon dioxide (CO2) emissions and RES-based electricity to produce synthetic natural gas with high methane (CH4) concentration. The fuel obtained can be stored or injected in the gas distribution infrastructure, becoming a clean energy vector. This paper investigates the functional parameters of such technologies, aiming to comparatively analyze their suitability for further integration in hybrid and ecofriendly energy systems. Given the stability of CO2 molecule, a catalyst must be used to overcome the methanation reaction kinetics limitations. Therefore, the required conditions (in terms of pressure and temperature) for CO2 methanation reaction unfolding are analyzed first. Further, CO2 conversion rate and CH4 selectivity are investigated in order to provide a detailed comparison of available technologies in the field, addressing moreover the particularities of catalyst preparation processes. It is found that Nickel (Ni) based catalysts are performing well, achieving good performances even at atmospheric pressure and low temperatures. It is remarkable that, within a [300,500]℃ temperature range, Ni-based catalysts enable a CO2 conversion rate over 78% with a CH4 selectivity of up to 100%. Last, integration perspectives and benefits are discussed, highlighting the crucial importance of the results presented in this paper.

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“…Renewable electricity generation, mainly from wind and solar energy, will play a relevant role in reaching this target [2]. As the adoption of renewable energy sources (RES) for electricity generation rises, the intrinsic fluctuating generation characteristic is introduced in the electric network [3]. This will have a strong impact on the management of the electric grid as it operates on a demand/offer basis and has a limited storage capacity (mainly as pumped hydroelectric storage).…”

Section: Introductionmentioning

confidence: 99%

Insights on a Methanation Catalyst Aging Process: Aging Characterization and Kinetic Study

et al. 2020

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Power to gas systems is one of the most interesting long-term energy storage solutions. As a result of the high exothermicity of the CO2 methanation reaction, the catalyst in the methanation subsystem is subjected to thermal stress. Therefore, the performance of a commercial Ni/Al2O3 catalyst was investigated over a series of 100 hour-long tests and in-process relevant conditions, i.e. 5 bar from 270 to 500 °C. Different characterization techniques were employed to determine the mechanism of the observed performance loss (N2 physisorption, XRD, TPO). The TPO analysis excluded carbon deposition as a possible cause of catalyst aging. The BET analysis evidenced a severe reduction in the total surface area for the catalyst samples tested at higher temperatures. Furthermore, a direct correlation was found between the catalyst activity decline and the drop of the catalyst specific surface. In order to correctly design a reliable methanation reactor, it is essential to have a kinetic model that includes also the aging kinetics. For this purpose, the second set of experiments was carried out, in order to determine the intrinsic kinetics of the catalyst. The kinetic parameters were identified by using nonlinear regression analysis. Finally, a power-law aging model was proposed to consider the performance loss in time.

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Techno-economic modelling of a Power-to-Gas system based on SOEC electrolysis and CO2 methanation in a RES-based electric grid

Cited by 112 publications

References 47 publications

Making quantitative sense of electromicrobial production

Making quantitative sense of electromicrobial production

Comparative analysis of carbon dioxide methanation technologies for low carbon society development

Insights on a Methanation Catalyst Aging Process: Aging Characterization and Kinetic Study

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