Stable metal-organic framework-supported niobium catalysts

Sol Ahn, Nicholas E. Thornburg, Zhanyong Li, Timothy C. Wang, Leighanne C. Gallington, Karena W. Chapman, Justin M Notestein, Joseph T Hupp, Omar K. Farha

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Developing structurally well-defined, supported oxide catalysts remains a significant challenge. Here, we report the grafting of Nb(V) oxide sites onto the nodes of the Zr-based metal organic framework (MOF) NU-1000 as a stable, well-defined catalyst support. Nb(V) oxide was deposited with loadings up to 1.6 mmol/g via two postsynthetic methods: atomic layer deposition in a MOF, and solution-phase grafting in a MOF. Difference envelope density measurements indicated that the two synthetic methods resulted in different local structures of the Nb(V) ions within NU-1000. Despite their high Nb(V) loadings, which were equivalent to >60% surface coverage, nearly all Nb(V) sites of the MOF-supported catalysts were active sites for alkene epoxidation, as confirmed by phenylphosphonic acid titration. The MOF-supported catalysts were more selective than the control Nb-ZrO2 catalyst for cyclohexene epoxidation with aqueous H2O2 and were far more active on a gravimetric basis.

Original languageEnglish
Pages (from-to)11954-11961
Number of pages8
JournalInorganic Chemistry
Volume55
Issue number22
DOIs
Publication statusPublished - Nov 21 2016

Fingerprint

Niobium
niobium
Metals
catalysts
Catalysts
Catalyst supports
Oxides
epoxidation
Epoxidation
metals
oxides
Atomic layer deposition
Alkenes
atomic layer epitaxy
Titration
titration
alkenes
envelopes
Ions
acids

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Ahn, S., Thornburg, N. E., Li, Z., Wang, T. C., Gallington, L. C., Chapman, K. W., ... Farha, O. K. (2016). Stable metal-organic framework-supported niobium catalysts. Inorganic Chemistry, 55(22), 11954-11961. https://doi.org/10.1021/acs.inorgchem.6b02103

Stable metal-organic framework-supported niobium catalysts. / Ahn, Sol; Thornburg, Nicholas E.; Li, Zhanyong; Wang, Timothy C.; Gallington, Leighanne C.; Chapman, Karena W.; Notestein, Justin M; Hupp, Joseph T; Farha, Omar K.

In: Inorganic Chemistry, Vol. 55, No. 22, 21.11.2016, p. 11954-11961.

Research output: Contribution to journalArticle

Ahn, S, Thornburg, NE, Li, Z, Wang, TC, Gallington, LC, Chapman, KW, Notestein, JM, Hupp, JT & Farha, OK 2016, 'Stable metal-organic framework-supported niobium catalysts', Inorganic Chemistry, vol. 55, no. 22, pp. 11954-11961. https://doi.org/10.1021/acs.inorgchem.6b02103
Ahn S, Thornburg NE, Li Z, Wang TC, Gallington LC, Chapman KW et al. Stable metal-organic framework-supported niobium catalysts. Inorganic Chemistry. 2016 Nov 21;55(22):11954-11961. https://doi.org/10.1021/acs.inorgchem.6b02103
Ahn, Sol ; Thornburg, Nicholas E. ; Li, Zhanyong ; Wang, Timothy C. ; Gallington, Leighanne C. ; Chapman, Karena W. ; Notestein, Justin M ; Hupp, Joseph T ; Farha, Omar K. / Stable metal-organic framework-supported niobium catalysts. In: Inorganic Chemistry. 2016 ; Vol. 55, No. 22. pp. 11954-11961.
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