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- Title
Enhanced Olefin Metathesis Performance of Tungsten and Niobium Incorporated Bimetallic Silicates: Evidence of Synergistic Effects.
- Authors
Wu, Jian‐Feng; Ramanathan, Anand; Kersting, Reinhard; Jystad, Amy; Zhu, Hongda; Hu, Yongfeng; Marshall, Craig P.; Caricato, Marco; Subramaniam, Bala
- Abstract
Tungsten and niobium incorporated KIT‐6 (WNb‐KIT‐6) materials were synthesized by a one‐pot sol‐gel method. During 2‐butene+ethylene metathesis with these materials at 450 °C, the propene yield is maximized (∼70 %) at a certain metal composition (∼20 wt% W and ∼1 wt% Nb), significantly surpassing those reported with an industrial WO3/SiO2 catalyst. The enhanced propene yield is attributed to better dispersion of W species on the catalyst surface and the formation of new active site precursors (O=)2W(O−Si)(O−Nb), as confirmed by XRD, TEM, H2‐TPR, XPS, EXAFS, and ToF‐SIMS techniques. Complementary DFT calculations reveal a positive correlation between the O=W=O bond angle and the propene yield. We therefore speculate that the −O−Nb moiety tunes the electronic environment around the W atom and increases the propene yield.
- Subjects
PROPENE; TUNGSTEN; NIOBIUM; ALKENES; BOND angles; SILICATES
- Publication
ChemCatChem, 2020, Vol 12, Issue 7, p2004
- ISSN
1867-3880
- Publication type
Article
- DOI
10.1002/cctc.201902131