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Bio-derived butadiene from cross-metathesis over silanol rich WO3 catalysts obtained from copper phyllosilicate
Author(s)
Date Issued
March 20, 2025
Type
Article
Abstract
Bio-butadiene can be produced from cross-metathesis of bioethanol-derived acetylene/ethylene over supported WO3 on silanol-rich silica prepared with Cu-leached copper phyllosilicate (CuPS). 20CuPS and 30CuPS were preliminarily reduced before Cu-leaching under an acidic solution (1 M HCl). Compared with fumed SiO229Si CPMAS NMR spectroscopy showed an increase in surface silanols, particularly the isolated silanols (Q3), from removing Cu2+ octahedral sites (Cu2+(OSi)6) encapsulated within tetrahedral silica layers of CuPS. The surface silanols in fumed SiO2, 20CuPS-Le, and 30CuPS-Le adequately accommodate single-site and polymeric WO3 species, leading to a similar 1,3-butadiene production rate (∼4.7 mmol h−1 gcat) at 5 wt% loading. Only 30CuPS-Le sufficiently provides the exposed silanols to disperse 8 wt% WO3 loading without bulk WO3 formation. The cross-metathesis activity depends on the relative amounts of exposed silanols. Accordingly, the steady 1,3-butadiene production was obtained in the order of 8WO3/30CuPS-Le (6.3 mmol h−1 gcat) > 8WO3/20CuPS-Le (5.1 mmol h−1 gcat) > 8WO3/SiO2 (2.5 mmol h−1 gcat).
Citation
Catalysis Science and Technology, 15(10), 3009-3021, 2025