Enhanced Olefin Metathesis Performance of Tungsten and Niobium Incorporated Bimetallic Silicates: Evidence of Synergistic Effects. Issue 7 (14th February 2020)

• Record Type: Journal Article
• Authors: Wu, Jian‐Feng; Ramanathan, Anand; Kersting, Reinhard; Jystad, Amy; Zhu, Hongda; Hu, Yongfeng; Marshall, Craig P.; Caricato, Marco; Subramaniam, Bala
• Is Part Of: ChemCatChem. Volume 12:Issue 7(2020)
• Page Start: 2004
• Page End: 2013
• Publication Date: 2020-02-14
• Subjects: metathesis -- tungsten -- bimetal synergy -- propene -- inorganic ligand effects; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201902131
• Languages: English
• ISSNs: 1867-3880

Abstract

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=)2 W(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. Abstract : Synergistic Metal Doping Effects : Niobium incorporation into W‐KIT‐6 materials significantly enhances propene yield during 2‐butene+ethylene metathesis reaction.