Abstract:

CCUS(carbon capture, utilization and storage) has been one of the primary measures worldwide to reduce carbon dioxide emissions, achieving sustainable development. However, the captured carbon dioxide(CO₂) at present is lacking commercial value, making the popularization of CCUS face many challenges. Power-to-gas technology utilizes CO₂ methanation reaction, using H₂ produced by captured CO₂ and green hydrogen technology to produce CH₄, which can reduce CO₂ emissions. It has the characteristics of low large-scale storage and transportation cost and long energy storage cycle. Compared with other CO₂ utilization technologies, it has obvious advantages and is expected to become an important technology for solving carbon emissions and renewable energy curtailment in China. At present, China lacks sufficient attention to methanation reaction and lacks relevant research and demonstration projects. The article analyzes the current research status and progress of methanation reaction internationally, including reaction thermodynamics, catalyst research, and demonstration projects of power-to-gas, in order to inspire the application of power-to-gas technology in China.

Key words: carbon dioxide, methanation, power-to-gas, CCUS, energy storage, hydrogen feedstock, electrolytic water

摘要：

碳捕捉技术已经成为减少温室气体排放、实现可持续发展的主要措施，但捕捉的CO₂缺乏商业价值，使碳捕捉技术的普及面临许多挑战。电转气技术利用CO₂甲烷化反应，使用捕捉的CO₂和绿氢技术生产的H₂制备CH₄,可以减少CO₂排放，具有大规模储运成本低、储能周期长的特点，相比于其他CO₂利用技术优势明显，有望成为我国解决碳排放和可再生能源弃电的重要技术。目前，我国缺少对甲烷化反应的相关研究和示范项目。文中分析了国际上甲烷化反应的研究现状和进展，包括反应热力学、催化剂研究、电转气示范项目等，以期对我国电转气技术的应用进行启发。

关键词: 二氧化碳, 甲烷化, 电转气, 碳捕捉, 储能, 氢原料, 电解水,