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Photocatalytic primary alcohol oxidation on WO3 nanoplatelets

机译:WO3纳米片上的光催化伯醇氧化

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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 ~(2) g ~(?1) WO _(3) . These nanoplatelets are active for the photocatalytic oxidation of the 1° alcohols benzyl alcohol (rate constant, k of 2.6 × 10 ~(?3) h ~(?1) ) and 5-(hydroxymethyl)-2-furfural ( k of 0.01 h ~(?1) ) using 10 mg of WO _(3) with 2 mL of 0.250 M substrate in acetonitrile and a 150 mW cm ~(?2) 460 nm blue LED source. As expected, these rate constants are larger than those observed for commercially prepared, micron-sized WO _(3) . XPS analysis shows that during catalysis, the concentration of W ~(5+) 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.
机译:借助在非水介质中通过微波辐射直接加热的方法,可以在200分钟内在30分钟内实现纳米晶体氧化钨(VI),比常规合成方法更快,温度更低。这些颗粒以血小板形态形成,小至20 nm,BET表面积为37 m〜(2)g〜(?1)WO_(3)。这些纳米片对1°醇苄醇(速率常数,k为2.6×10〜(?3)h〜(?1))和5-(羟甲基)-2-糠醛(k为0.01)的光催化氧化具有活性使用10 mg WO_(3)和2 mL乙腈中的0.250 M底物,以及150 mW cm〜(?2)460 nm蓝色LED源。如所期望的,这些速率常数大于对于商业制备的微米级WO 3所观察到的那些。 XPS分析表明,在催化过程中,表面的W〜(5+)浓度增加,但是纳米片在这些反应条件下是稳定的。通过反应保留了颗粒的整体形态和尺寸。此外,纳米片是可回收的,在四个反应循环中均未显示活性损失。

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