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How Recyclability Can Reduce Induction Period of Gold Nanocatalysts

机译：回收性如何降低金纳催化剂的诱导期

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The effect of recyclability on the catalytic activity of supported Au-101(PPh3)(21)Cl-5 nanoparticles (1.0 wt% Au-101/AC) was investigated for benzyl alcohol oxidation under mild conditions. The influence of recyclability on the catalytic activity of activated Au-101/AC nanocatalysts was studied trough a comparison of gold particle diameter and also catalysts conversion between the fresh (as synthesized) and recycled gold catalysts. The monitoring of gold particle diameters by transmission electron microscopy (TEM) showed that the gold particles size gradually increased during the catalytic reaction. The mean diameter of the fresh gold catalysts increased from approximately 3 to 3.2, 5.1 and 5.3 nm after 1, 2 and 3 h reaction time, respectively. Whereas the average gold particle diameter of the recycled samples were slightly enlarged from approximately 5.3 (the sample recycled after 3 h of the first catalytic test) to 5.7, 5.9 and 6.2 nm with durations of 1, 2 and 3 h reaction time, respectively. Therefore, larger gold particles gradually formed for fresh and also recycled gold catalysts during reaction tests. Meanwhile, the catalytic activity of activated 1.0 wt% Au-101/AC catalysts jumped to full conversion when the recycled gold catalysts were utilized due to removing ligand stabilizer from gold particles and so bigger particles had formed.
机译：在温和条件下研究了在温和条件下研究了在温和条件下对苄醇氧化的支持AU-101（PPH3）（21）Cl-5纳米颗粒（1.0wt％Au-101 / Ac）的催化活性的影响。研究了对活化的Au-101 / Ac纳米催化剂催化活性对活化的Au-101 / Ac纳米催化剂的影响进行了槽的比较，并且在新鲜（如合成）和再循环金催化剂之间的催化剂转化率。通过透射电子显微镜（TEM）对金粒径的监测表明，在催化反应期间，金颗粒尺寸逐渐增加。在1,2和3 H反应时间后，新鲜金催化剂的平均直径升高约3至3.2,5.1和5.3nm。然而，再循环样品的平均金粒径从大约5.3（在第一次催化试验中的3小时后再循环）略微扩大至5.7,5.9和6.2nm，分别为1,2和3 h反应时间。因此，在反应试验期间，较大的金颗粒逐渐形成为新鲜的和再循环的金催化剂。同时，当使用从金颗粒中除去配体稳定剂的再循环金催化剂时，活化的1.0wt％Au-101 / AC催化剂的催化活性跃升至全转化。形成更大的颗粒。

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