Photocatalytic primary alcohol oxidation on WO 3 nanoplatelets
With the aid of direct heating through microwave irradiation in non-aqueous media, nanocrystalline tungsten(vi) oxide is achievable in 30 minutes at 200 °C, faster and at a lower temperature than conventional synthesis methods. Forming in a platelet morphology, these particles are as small as 20 nm...
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Veröffentlicht in: | RSC advances 2019-09, Vol.9 (49), p.28688-28694 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | With the aid of direct heating through microwave irradiation in non-aqueous media, nanocrystalline tungsten(vi) oxide is achievable in 30 minutes at 200 °C, faster and at a lower temperature than conventional synthesis methods. Forming in a platelet morphology, these particles are as small as 20 nm with a BET surface area of 37 m
g
WO
. These nanoplatelets are active for the photocatalytic oxidation of the 1° alcohols benzyl alcohol (rate constant,
of 2.6 × 10
h
) and 5-(hydroxymethyl)-2-furfural (
of 0.01 h
) using 10 mg of WO
with 2 mL of 0.250 M substrate in acetonitrile and a 150 mW cm
460 nm blue LED source. As expected, these rate constants are larger than those observed for commercially prepared, micron-sized WO
. XPS analysis shows that during catalysis, the concentration of W
on the surface increases, but the nanoplatelets are stable under these reaction conditions. The overall morphology and size of the particles are retained through the reactions. Moreover, the nanoplatelets are recyclable-showing no loss in activity for four reaction cycles. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C9RA04839A |