Transformation of CO2 into liquid fuels and synthetic natural gas using green hydrogen: A comparative analysis. (1st May 2021)

• Record Type: Journal Article
• Authors: Gao, Ruxing; Zhang, Chundong; Jun, Ki-Won; Kim, Seok Ki; Park, Hae-Gu; Zhao, Tiansheng; Wang, Lei; Wan, Hui; Guan, Guofeng
• Is Part Of: Fuel. Volume 291(2021)
• Publication Date: 2021-05-01
• Subjects: CO2 hydrogenation -- Liquid fuels -- Synthetic natural gas -- Techno-economic analysis; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.120111
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The indirect CO2 hydrogenation processes are proposed for CO2 transformation. CO2 is converted via reverse water–gas-shift, Fischer-Tropsch synthesis and CO2 methanation. A comparative study between the indirect and direct CO2 hydrogenation processes are conducted. The indirect CO2 hydrogenation processes have higher syncrude production than the direct ones. The direct CO2 hydrogenation processes are more energy-efficient than the indirect ones. Abstract: The power-to-liquids (P2L) and power-to-gas (P2G) processes which utilize renewable power to convert carbon dioxide and water into value-added syncrude and synthetic natural gas have recently gained much attention as an efficient way for CO2 mitigation. Based on our previously proposed direct P2L and P2L/P2G hybrid processes in the absence of the reverse-water–gas-shift unit, in this work, we developed the indirect P2L and P2L/P2G hybrid processes combined with the reverse-water–gas-shift unit, which produce solely syncrude and the combination of syncrude and synthetic natural gas, respectively. A comparative study of the indirect and direct P2L and P2L/P2G hybrid processes via the process modelling and techno-economic analysis was implemented to quantitatively evaluate their process performance differences, and it was indicated that the indirect P2L and P2L/P2G hybrid processes were also able to be considered as suitable technologies for the transformation of CO2 into high-value hydrocarbons, and the indirect P2L/P2G hybrid process seemed to be more competitive than the indirect P2L process from both technical and economic aspects. Moreover, compared to the direct P2L and P2L/P2G hybrid processes, the indirect P2L and P2L/P2G hybrid processes produce more syncrude, however, they are less efficient in aspects of energy efficiency and net CO2 reduction.