Illustrating new understanding of adsorbed water on silica for inducing tetrahedral cobalt(II) for propane dehydrogenation

Highly dispersed metal sites on the surface of silica, achieved from immobilization of metal precursor within hydroxyl groups, has gained increasing attention in the field of heterogeneous catalyst. However, the special role of adsorbed water derived by hydroxyl groups on the silica is generally ign...

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Bibliographic Details
Published in:Nature communications 2023-01, Vol.14 (1), p.100-100, Article 100
Main Authors: Huang, Zijun, He, Dedong, Deng, Weihua, Jin, Guowu, Li, Ke, Luo, Yongming
Format: Article
Language:English
Subjects:
639/638/169/896
639/638/77/885
639/638/77/887
Catalysts
Chemical synthesis
Cobalt
Dehydrogenation
Dispersion
Humanities and Social Sciences
Hydroxyl groups
Immobilization
multidisciplinary
Pollutants
Precursors
Propane
Science
Science (multidisciplinary)
Silica
Silicon dioxide
VOCs
Volatile organic compounds
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Summary:Highly dispersed metal sites on the surface of silica, achieved from immobilization of metal precursor within hydroxyl groups, has gained increasing attention in the field of heterogeneous catalyst. However, the special role of adsorbed water derived by hydroxyl groups on the silica is generally ignored. Herein, a new understanding of adsorbed water on the formation of highly dispersed tetrahedral Co(II) (T d -cobalt(II)) sites is illustrated. It is indicated that sufficient adsorbed water induces the transformation of precursor of Co(NO 3 ) 2 into intermediate of [Co(H 2 O) 6 ] 2+ . Subsequently, [Co(H 2 O) 6 ] 2+ makes the highly dispersed T d -cobalt(II) sites to be available during direct H 2 -reduction process. A systematic characterization and DFT calculation prove the existence of the adsorbed water and the importance of the intermediate of [Co(H 2 O) 6 ] 2+ , respectively. The as-synthesized catalyst is attempted to the propane dehydrogenation, which shows better reactivity when compared with other reported Co based catalysts. Metal sites immobilized by hydroxyl groups gain great attention, however, the role of adsorbed water derived by hydroxyl groups on the silica is generally ignored. Herein, the authors propose a new understanding of adsorbed water on the immobilization of highly dispersed tetrahedral Co(II).
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-35698-0