Power-to-X technology using renewable electricity and carbon dioxide from ambient air: SOLETAIR proof-of-concept and improved process concept

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    This work demonstrates hydrocarbon production directly from water, solar energy, and air - called SOLETAIR. The plant includes direct air capture (DAC) of carbon dioxide, hydrogen production by water electrolysis, and two-step synthesis bench-scale units that operate using grid-connected solar photovoltaic (PV) electricity. In addition, co-feeding of hydrogen and carbon monoxide from gas bundles are utilized to enable scaling between units. This pilot plant achieved a total operating time of approx. 300 h with a combined production of oil and wax of 6.2 kg per day. The mass and energy balances in integration of the units are studied. According to the experiments and studies, potential and bottlenecks to improve the individual units and their integration are found. Finally, a conceptual Power-to-X plant is presented, which can achieve energy and carbon efficiencies of 47% and 94%, respectively, considering liquid and solid hydrocarbons as products.
    Original languageEnglish
    Pages (from-to)235-246
    JournalJournal of CO2 Utilization
    Volume28
    Early online date15 Oct 2018
    DOIs
    Publication statusPublished - 2018
    MoE publication typeA1 Journal article-refereed

    Funding

    TEKES is acknowledged for the main financial support of the SOLETAIR project (soletair.fi). The project partners are also thanked for their financial and in-kind contributions. The SOLETAIR project concept was developed from the work carried out in the Neo-Carbon Energy project (neocarbonenergy.fi).

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 7 - Affordable and Clean Energy
      SDG 7 Affordable and Clean Energy
    2. SDG 13 - Climate Action
      SDG 13 Climate Action

    Keywords

    • Carbon capture and utilization
    • Direct air capture
    • Fischer-Tropsch synthesis
    • Power-to-X
    • Water electrolysis

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