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Photocatalytic primary alcohol oxidation on WO3 nanoplatelets

机译:WO3纳米纳米片上的光催化初级醇氧化

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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 degrees 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) WO3. These nanoplatelets are active for the photocatalytic oxidation of the 1 degrees alcohols benzyl alcohol (rate constant, k of 2.6 x 10(-3) h(-1)) and 5-(hydroxymethyl)-2-furfural (k of 0.01 h(-1)) using 10 mg of WO3 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 WO3. XPS analysis shows that during catalysis, the concentration of W5+ 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:借助于通过微波照射在非水介质中的微波照射的借助,纳米晶钨(VI)氧化物可在30分钟内以200℃,比常规合成方法更低,更低的温度可实现。在血小板形态形成,这些颗粒具有27m(2 )g(-1)WO3的BET表面积小至20nm。这些纳米纳薄物用于光催化氧化1℃醇苄醇(速率常数,k为2.6×10(-3)H(-1))和5-(羟甲基)-2-糠(k为0.01h( -1))使用10mg WO3,乙腈中的2ml 0.250m底板和150mWcm(-2)460nm蓝色LED源。正如预期的那样,这些速率常数大于观察到商业制备的微米尺寸WO3的速率常数。 XPS分析表明,在催化期间,表面上的W5 +浓度增加,但在这些反应条件下纳米孔呈稳定。颗粒的整体形态和大小通过反应保留。此外,纳米泊素可回收 - 显示出四个反应循环的活性损失。

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    《RSC Advances》 |2019年第49期|共7页
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  • 正文语种 eng
  • 中图分类 化学;
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