{
  "abstract": "γ-alumina (γ-Al2O3) supported vanadium oxide represent a notable class of heterogenous catalysts used for the direct oxidative propane dehydrogenation (ODH) reaction. However, while the presence of highly dispersed VOx (V5+) species has been established, understanding the exact structure of surface sites and the role of supports remains a pivotal objective for establishing structure-property relationships. Considering the structural complexity of γ-Al2O3 surfaces, where distinct surface sites emerge as a function of specific facets and edges, clarifying how the support dictates vanadium speciation remains a key objective. In this work, we employ Surface Organometallic Chemistry (SOMC) approach to evaluate the impact of the γ-Al2O3 nanocrystals morphology on the nature and structure of surface vanadium sites. Specifically, we grafted vanadyl isopropoxide (VO(OiPr)3) on tailored γ-Al2O3 nanocrystals, namely Rhomboids, Laths and Needles, exposing varying distributions of (110), (100) and (111) facets along with characteristic edges sites. Subsequent calcination yields supported, organic-ligand-free, monomeric vanadia sites. Advanced 51V solid-state NMR spectroscopy combined with DFT calculations reveals that grafting on γ-Al2O3 partially dehydroxylated at 500 °C directly generate bipodal VO(OiPr) species, whose structures depend on the underlying surface facets and edge sites. Furthermore, the supported vanadia sites formed upon calcination are also characterized by distinct V-O coordination numbers and hydroxylation states, which are quantitatively resolved across γ-Al2O3 morphologies. This work not only elucidates the complex speciation of V supported on γ-Al2O3 support, but also offers fundamental insights into the reactive surface sites on γ-Al2O3 that stabilize isolated metal species.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Chemistry and Applied Biosciences",
    "Zürich"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Weicheng Cao",
      "orcid": "0000-0002-3569-2006"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Charles Sidhoum"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Andri Florin"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Christophe Copéret"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c6j4c8e16c5ae.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15008342/v1",
  "fulltext_url": null,
  "id": "c6j4c8e16c5ae",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008342/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",
      "1503|Catalysis and Oxidation Reactions"
    ]
  ],
  "openalex": "W7208716118",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15008342/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/c6j4c8e16c5ae.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:17Z",
      "native_id": "10.26434/chemrxiv.15008342",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008342/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:1503|Catalysis and Oxidation Reactions",
      "subfield": "catalysis"
    }
  ],
  "title": "Site-Specific Speciation of Vanadium Sites on γ-Al2O3 Facets and Edges from 51V SSNMR Spectroscopy",
  "title_text": "Site-Specific Speciation of Vanadium Sites on γ-Al2O3 Facets and Edges from 51V SSNMR Spectroscopy",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:17Z",
  "url": "https://research.draconitic.com/paper/c6j4c8e16c5ae",
  "venue": "ChemRxiv",
  "versions": []
}