{
  "abstract": "Developing efficient technologies for CO oxidation is an urgent priority in environmental catalysis. Copper oxide deposited on cerium oxide (CuO/CeO 2 ) has attracted considerable attention as a promising non-precious-metal catalyst for low-temperature CO oxidation. Furthermore, aerosol process emerged as a scalable route to engineer CuO/CeO 2 with tailored structures and interfacial properties, however, popular vapor-fed and liquid-fed aerosol flame approaches remain constrained by precursor requirements (vapor-fed: sufficient vapor pressure; liquid-fed: precursor solubility or dispersibility in carrier solvents). Here, for the first time, we introduce solid-fed aerosol flame synthesis (SAFS) as a single-step, solvent-free route to synthesize heterostructured CuO/CeO 2 catalysts. Through selective vaporization of Cu 2 O followed by heterogeneous nucleation onto solid CeO 2 particles, SAFS produces a well-defined architecture of CuO nanoparticles intimately deposited on CeO 2 supports. By varying the flame conditions and Cu loading, we systematically investigate their effects on particle formation, interfacial properties, and catalytic performance. The highest performance catalyst, synthesized at 2 L/min-CH 4 flame with 2 wt.% Cu 2 O, exhibits the highest CO oxidation activity, achieving a CO oxidation rate of 13.73 mLCO/min·gcat and a turnover frequency of 0.026 s -1 at 120 ºC. This enhanced performance, compared to other as-prepared CuO/CeO 2 samples, arises from an optimal balance between oxygen vacancy generation and metal-support interaction achieved during the SAFS process. Here, oxygen vacancy generation is favored under fuel-rich conditions, whereas metal-support interaction decreases with CeO 2 sublimation and CuO nanoparticle sintering under elevated combustion enthalpy. These findings advance the fundamental understanding of flame-based synthesis and provide a scalable route toward high-performance, cost-effective catalysts for environmental remediation.",
  "abstract_shown": true,
  "affiliations": [
    "Chemical Engineering Program, Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima City, Hiroshima, Japan, 739-8527"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Tung Van Pham",
      "orcid": "0000-0003-3626-0843"
    },
    {
      "affs": [
        0
      ],
      "name": "Tomoyuki Hirano",
      "orcid": "0000-0003-3622-0606"
    },
    {
      "affs": [
        0
      ],
      "name": "Izuki Maruhashi"
    },
    {
      "affs": [
        0
      ],
      "name": "Eka Lutfi Septiani"
    },
    {
      "affs": [
        0
      ],
      "name": "Kiet Le Anh Cao"
    },
    {
      "affs": [
        0
      ],
      "name": "Takashi Ogi",
      "orcid": "0000-0003-3982-857X"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5c1xpa4fdndz3.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15009771/v1",
  "fulltext_url": null,
  "id": "5c1xpa4fdndz3",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009771/v1",
  "language": null,
  "licence": "CC-BY-NC-ND",
  "licence_label": "CC BY-NC-ND",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2505|Catalytic Processes in Materials Science"
    ]
  ],
  "openalex": "W7216156263",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15009771/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/5c1xpa4fdndz3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:21Z",
      "native_id": "10.26434/chemrxiv.15009771",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009771/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Catalytic Processes in Materials Science",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Revealing Solvent-free Solid-fed Aerosol Flame Technique to Synthesize Copper Oxide Deposited on Ceria Catalyst for Efficient CO Oxidation Applications",
  "title_text": "Revealing Solvent-free Solid-fed Aerosol Flame Technique to Synthesize Copper Oxide Deposited on Ceria Catalyst for Efficient CO Oxidation Applications",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:21Z",
  "url": "https://research.draconitic.com/paper/5c1xpa4fdndz3",
  "venue": "ChemRxiv",
  "versions": []
}