Covalent heterogenization of discrete bis(8-quinolinolato) dioxomolybdenum(VI) and dioxotungsten(VI) complexes by a metal-template/metal- exchange method : Cyclooctene epoxidation catalysts with enhanced performances

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Ying Yang
  • Soma Chattopadhyay
  • Tomohiro Shibata
  • Sungsik Lee
  • Qiubin Kan

Detail(s)

Original languageEnglish
Pages (from-to)134-142
Journal / PublicationJournal of Molecular Catalysis A: Chemical
Volume392
Publication statusPublished - Oct 2014
Externally publishedYes

Abstract

A metal-template/metal-exchange method was used to imprint covalently attached bis(8-quinolinolato)dioxomolybdenum(VI) and dioxotungsten(VI) complexes onto large surface-area, mesoporous SBA-15 silica to obtain discrete MoO 2VIT and WO2VIT catalysts bearing different metal loadings, respectively. Homogeneous counterparts, MoO 2VIN and WO2VIN, as well as randomly ligand-grafted heterogeneous analogues, MoO2VIG and WO2VIG, were also prepared for comparison. X-ray absorption fine structure (XAFS), pair distribution function (PDF) and UV-vis data demonstrate that MoO2VIT and WO2 VIT adopt a more solution-like bis(8-quinolinol) coordination environment than MoO2VIG and WO2VIG, respectively. Correspondingly, the templated MoVI and WVI catalysts show superior performances to their randomly grafted counterparts and neat analogues in the epoxidation of cyclooctene. It is found that the representative MoO2VIT-10% catalyst can be recycled up to five times without significant loss of reactivity, and heterogeneity test confirms the high stability of MoO2VIT-10% catalyst against leaching of active species into solution. The homogeneity of the discrete bis(8-quinolinol) metal spheres templated on SBA-15 should be responsible for the superior performances. © 2014 Elsevier B.V.

Research Area(s)

  • 8-Quinolinol, Cyclooctene epoxidation, Metal-template/metal-exchange, Molybdenum, SBA-15, Tungsten

Bibliographic Note

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Citation Format(s)

Covalent heterogenization of discrete bis(8-quinolinolato) dioxomolybdenum(VI) and dioxotungsten(VI) complexes by a metal-template/metal- exchange method: Cyclooctene epoxidation catalysts with enhanced performances. / Yang, Ying; Chattopadhyay, Soma; Shibata, Tomohiro et al.
In: Journal of Molecular Catalysis A: Chemical, Vol. 392, 10.2014, p. 134-142.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review