Special Issue "Power to Gas (P2G) and Carbon Capture and Utilization (CCU) Technologies Combination"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Hydrogen Energy".

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editor

Dr. Giorgio Vilardi
Guest Editor
Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Rome, Italy
Interests: process intensification; methanation; P2G; exergy; industrial and environmental catalysis; nano-catalysts production; adsorption; plant units design and modelling; process development and scale-up; dynamic modelling; wastewater treatment
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Special Issue Information

Dear Colleagues,

To offer a response to the global challenge of greenhouse gas emission reduction, various researchers and companies are focusing their studies on CO2 capture and usage in different processes. A possible carbon dioxide re-utilization process may be its hydrogenation to produce methane to be injected into the natural gas grid or used as LPG for other industrial processes. The power to gas concept is based on the transformation of electrical energy into a gas fuel and involves the use of surplus power from renewable sources to split water into hydrogen and oxygen by an electrolyzer. Hydrogen can be then used for different purposes, such as the reduction of carbon dioxide to methane. The combination of CCU and P2G technologies in the same industrial plant results in a very interesting possibility to simultaneously reduce greenhouse emissions and utilize power surplus from renewable sources to produce a gas that can be immediately used or transported by the consolidated infrastructure present in most industrialized countries.

In this Special Issue, the interested researchers are invited to submit original research papers, as well as review articles, on any of the topics related to P2G, CCU, and their combination in the same plant, focusing on the optimization of the plant for efficiency improvement, considering classical technical and economical analysis or/and exergetic and economic analysis. Papers related to innovations in the optimization of the methanation process (catalysis and reactor configurations) are particularly welcome.

Dr. Giorgio Vilardi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • Methanation
  • P2G
  • CCU
  • Plant optimization
  • Sensitivity analysis
  • Economical analysis
  • Exergetic analysis
  • Plug flow reactor

Published Papers (1 paper)

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Open AccessArticle
Utilization of CO2 as Cushion Gas for Depleted Gas Reservoir Transformed Gas Storage Reservoir
Energies 2020, 13(3), 576; https://doi.org/10.3390/en13030576 - 25 Jan 2020
Underground gas storage reservoirs (UGSRs) are used to keep the natural gas supply smooth. Native natural gas is commonly used as cushion gas to maintain the reservoir pressure and cannot be extracted in the depleted gas reservoir transformed UGSR, which leads to wasting [...] Read more.
Underground gas storage reservoirs (UGSRs) are used to keep the natural gas supply smooth. Native natural gas is commonly used as cushion gas to maintain the reservoir pressure and cannot be extracted in the depleted gas reservoir transformed UGSR, which leads to wasting huge amounts of this natural energy resource. CO2 is an alternative gas to avoid this particular issue. However, the mixing of CO2 and CH4 in the UGSR challenges the application of CO2 as cushion gas. In this work, the Donghae gas reservoir is used to investigate the suitability of using CO2 as cushion gas in depleted gas reservoir transformed UGSR. The impact of the geological and engineering parameters, including the CO2 fraction for cushion gas, reservoir temperature, reservoir permeability, residual water and production rate, on the reservoir pressure, gas mixing behavior, and CO2 production are analyzed detailly based on the 15 years cyclic gas injection and production. The results showed that the maximum accepted CO2 concentration for cushion gas is 9% under the condition of production and injection for 120 d and 180 d in a production cycle at a rate of 4.05 kg/s and 2.7 kg/s, respectively. The typical curve of the mixing zone thickness can be divided into four stages, which include the increasing stage, the smooth stage, the suddenly increasing stage, and the periodic change stage. In the periodic change stage, the mixed zone increases with the increasing of CO2 fraction, temperature, production rate, and the decreasing of permeability and water saturation. The CO2 fraction in cushion gas, reservoir permeability, and production rate have a significant effect on the breakthrough of CO2 in the production well, while the effect of water saturation and temperature is limited. Full article
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