WO x supported on γ-Al 2 O 3 with different morphologies as model catalysts for alkanol dehydration

Shi, Dachuan; Wang, Huamin; Kovarik, Libor; Gao, Feng; Wan, Chuan; Hu, Jian Zhi; Wang, Yong

doi:10.1016/j.jcat.2018.04.004

WO x supported on γ-Al 2 O 3 with different morphologies as model catalysts for alkanol dehydration

Journal Article · Sun Jul 01 04:00:00 EDT 2018 · Journal of Catalysis

DOI:https://doi.org/10.1016/j.jcat.2018.04.004· OSTI ID:1435890

Shi, Dachuan; Wang, Huamin; Kovarik, Libor; Gao, Feng; Wan, Chuan; Hu, Jian Zhi; Wang, Yong

The distinctive morphological and surface characteristics of platelet-like γ-Al2O3 were compared to a regular, commercial γ-Al2O3. γ-Al2O3 platelets display dominant (110) surface facets and higher densities of coordinative unsaturated penta-coordinate Al3+ (Al3+penta) sites than regular γ-Al2O3, as measured by solid-state magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR). Such Al3+penta sites are also the preferred surface anchoring sites for tungsten oxide (WOx) species consistent with NMR analysis indicating that these sites are consumed upon WOx adsorption. The higher Al3+penta density on γ-Al2O3 platelets leads to greater WOx dispersion (or smaller WOx clusters), as demonstrated by scanning transmission electron microscopy and ultraviolet–visible spectroscopy, and WOx species at intermediate WOx surface concentration are the most active for the probe reaction of 2-butanol dehydration. WOx on γ-Al2O3 platelets approaches the highest turnover rates at higher surface densities than WOx on regular γ-Al2O3, yet with similar highest rate values for both series of catalysts. This indicates that different Al2O3 supports mainly affect the dispersion of supported WOx rather than the intrinsic reactivity of individual WOx clusters with similar size.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1435890

Report Number(s):: PNNL-SA-132764; 49339; KC0302010

Journal Information:: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: C Vol. 363; ISSN 0021-9517

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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