以非双通的多孔氧化铝(AAO)(Al基底为支撑体)为模板,基底Al作为还原剂,在AAO孔道内原位合成了Pd单质(Pd/AAO). 本文详细研究了AAO阻挡层的去除以及Pd/AAO的酸腐蚀处理后的情况. 采用扫描电子显微镜观察了不同条件下形成的形貌,提出了一个近似合理的生成Pd单质的机理. 评价了其对苯硼酸和对溴苯甲醛Suzuki反应的活性. 摩尔分数0.06%Pd催化剂在温和的实验条件下可以高效催化Suzuki反应,产率达到99.8%. Pd/AAO固体片状结构在液相反应中直接从溶液中取出即可进行下一次反应,易于分离和回收,可使用性强. 此研究为有机反应异相催化剂的设计提供了一个有效的思路,在实际应用中具有一定的指导意义.
Using non-through-hole anodic aluminum oxide(AAO) as templates, with Al substrate as support body, Pd nanomaterials were prepared in situ in the channels of AAO with Al substrate as reducing agent.The removal of barrier layer and acid corrosion post-treatment of synthesized Pd/AAO were studied.The Pd morphologies under different situations were observed by scanning electronic microscopy.A plausible mechanism of Pd formation was proposed.The catalytic activity for Suzuki reaction of 4-bromobenzene carboxylic acid and phenylboronic acid was investigated with Pd/AAO as heterogeneous catalysts.It is found that Pd/AAO catalysts exhibit excellent catalytic activity, and the yield is up to 99.8% with 0.06% molar fraction of Pd.The catalysts with sheet structure are easily separated for recovery by just taking out of the solution and can be reused in the next time.This research gives a practical method for the design of heterogeneous catalysts in organic reactions.
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