{
  "abstract": "Solid sorbent-based direct air capture (DAC) is a promising pathway for durable carbon dioxide removal (CDR), but large-scale deployment remains constrained by sorbent degradation and the high cost and energy associated with temperature-vacuum swing adsorption (TVSA). Here, we introduce a hydrogen (H2)-enabled gaseous concentration swing adsorption (GCSA) process that eliminates vacuum and enables regeneration at 35–70 °C using a closed-loop H2 sweep with a commercial amine sorbent. By lowering the CO2 partial pressure under reducing conditions near ambient pressure, H2-GCSA achieves effective regeneration with reduced thermal severity and suppressed oxidative degradation. Accelerated testing between 65 and 95 °C under oxidative and anaerobic environments demonstrates superior sorbent stability over 100 h under oxygen-free conditions. A process-integrated techno-economic analysis for a 100,000 tCO2/yr modular DAC plant, utilizing a total of less than 8.5 tons of H2 and incorporating downstream H2/CO2 separation via pressure swing adsorption (PSA), projects an energy demand of 2.78 GJ/tCO2 (775 KWh/tCO2) and a capture cost of 81 USD/tCO2, representing a 2–3× lower capital cost and 1.5–4× lower energy demand relative to TVSA. Further process integration using low-grade waste heat and PSA elimination reduces the energy demand to 0.85 GJ/tCO2 (235 KWh/tCO2), with projected costs approaching 31 USD/tCO2. Sensitivity analysis indicates that the sorbent cost below 95 USD/kg enables DAC below 100 USD/tCO2. Collectively, these results demonstrate that H2 sweep-mediated GCSA offers a scalable, lower-energy alternative to vacuum-driven (TVSA) regeneration on a wide range of sorbents, eliminating the sorbent material development risks and addressing a central bottleneck in solid-sorbent DAC.",
  "abstract_shown": true,
  "affiliations": [
    "Dair Capture, Inc. , 7 Dana Rd , , ,",
    "University of Miami , , , ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Harshul Thakkar",
      "orcid": "0000-0001-7700-1026"
    },
    {
      "affs": [
        1
      ],
      "name": "Usman Shareef"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/87w05jry7vdn1.bib",
  "cited_by": 0,
  "doi": "10.1021/acsomega.6c05892",
  "fulltext_url": null,
  "id": "87w05jry7vdn1",
  "issns": [
    "2470-1343"
  ],
  "landing_url": "https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c05892/5462435/Energy-Efficient-and-Low-Temperature-Gaseous",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": "https://pubs.acs.org/doi/pdf/10.1021/acsomega.6c05892",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/87w05jry7vdn1.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T00:23:04Z",
      "native_id": "10.1021/acsomega.6c05892",
      "source": "crossref",
      "url": "https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c05892/5462435/Energy-Efficient-and-Low-Temperature-Gaseous"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "issn:2470-1343",
      "subfield": "general"
    }
  ],
  "title": "Energy-Efficient and Low-Temperature Gaseous Concentration Swing Adsorption (GCSA)-Based Regeneration Method Utilizing Hydrogen Sweep for Direct Air Capture",
  "title_text": "Energy-Efficient and Low-Temperature Gaseous Concentration Swing Adsorption (GCSA)-Based Regeneration Method Utilizing Hydrogen Sweep for Direct Air Capture",
  "type": "peer-reviewed",
  "updated_at": "2026-11-04T00:23:54Z",
  "url": "https://research.draconitic.com/paper/87w05jry7vdn1",
  "venue": "ACS Omega",
  "versions": []
}