Power to gas energy storage is usually conceived as a carbon utilization technology, as it consumes CO₂ for the production of synthetic fuels. However, some authors put in doubt its potential for mitigating global warming, since CO₂ is released to the atmosphere when the synthetic fuel is used. In this paper, we demonstrate that power to gas can be an effective mitigation option under certain design configurations. When synthetic fuels are used in the same installation where the CO₂ is captured (industry or power plant) then CO₂ could be effectively recycled. This “CO₂ recycle concept” allows the use of renewable energy to satisfy thermal demands of industry or other sectors avoiding carbon emissions. This proposal is useful for decarbonising industrial processes based on fossil-fuels that cannot be decarbonised by direct renewable electrification. The paper provides key aspects to define a catalytic power-to-gas system where the CO₂ is captured (through amine scrubbing or oxyfuel technology) and recycled. It analyses system efficiency, overall emissions and economic feasibility of the concept.

气能存储的动力通常被认为是一种碳利用技术，因为它消耗CO ₂来生产合成燃料。但是，由于使用合成燃料时，CO ₂释放到大气中，因此一些作者对缓解全球变暖的潜力表示怀疑。在本文中，我们证明了在某些设计配置下，燃气发电是一种有效的缓解措施。当在捕获CO ₂的同一设施（工业或发电厂）中使用合成燃料时，则可以有效地回收CO ₂。这个“ CO ₂循环概念”允许使用可再生能源来满足工业或其他部门的热需求，从而避免碳排放。该建议对于基于化石燃料的工业过程脱碳很有用，而化石燃料无法通过直接可再生电气化来脱碳。本文提供了一些关键方面，以定义一种催化动力-气体系统，在该系统中捕获CO ₂（通过胺洗涤或含氧燃料技术）并进行再循环。它分析了系统效率，总体排放和经济可行性的概念。