负载于酸活化蒙脱土（Ni°-Mont）上的Ni0纳米粒子的合成与表征
Synthesis and characterization of Ni0 NPs immobilized on acid activated montmorillonite (Ni°-Mont) as an efficient and reusable heterogeneous catalyst for one-pot synthesis of biscoumarins under microwave irradiation
摘要：
本文描述了通过将Ni（OAc）2浸渍到酸活化蒙脱土K10的纳米孔中，然后通过多元醇还原原位制备固定在酸活化蒙脱土K10（Ni°-Mont）上的Ni°纳米颗粒。Ni° NPs高度分散在所检查的粘土的表面上或溶胀夹层内部的初始介孔中，平均尺寸为10-20 nm。在受控条件下用HCl（4 M）进行蒙脱石的酸处理，以产生作为Ni° NP主体的所需孔径。制备的Ni°-Mont作为高效的非均相催化剂用于一锅法合成双香豆素，产率为85-95%。在微波辐射下，芳香醛与4-羟基香豆素发生Knoevenagel缩合反应。Ni°-Mont催化剂重复使用7次以上，催化活性无明显损失。
英文摘要：
The present paper describes in situ preparation of Ni° nanoparticles immobilized on acid activated montmorillonite K10 (Ni°-Mont) by impregnation of Ni(OAc)2 into nanopores of acid activated montmorillonite K10 followed by polyol reduction. Ni° NPs was highly dispersed into the initiated mesopores on the surface or inside swelled-interlayers of the examined clay with average size of 10-20 nm. Acid treatment of montmorillonite was carried out with HCl (4 M) under controlled conditions for generation of the desired pore sizes as a host of Ni° NPs. The prepared Ni°-Mont was used as a highly efficient heterogeneous catalyst for one-pot synthesis of biscoumarins in 85-95% yields. The reactions were carried out via Knoevenagel condensation of aromatic aldehydes with 4-hydroxycoumarin under microwave irradiation. The Ni°-Mont catalyst was reused at least for seven times without significant loss of its catalytic activity.
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