Gas Conversion Department, Faculty of Petrochemicals, Iran Polymer and Petrochemicals Institute, PO Box 14975-112, Tehran, Iran.
Department of Chemistry, School of Science, Alzahra University, PO Box 1993891176, Vanak, Tehran, Iran.
Int J Biol Macromol. 2018 Oct 15;118(Pt B):1903-1911. doi: 10.1016/j.ijbiomac.2018.07.053. Epub 2018 Jul 19.
Combining the exceptional features of halloysite and starch, a unique hybrid was synthesized based on conjugation of amine-functionalized starch with Cl-halloysite nanoclay followed by coordination of Pd (II) acetate. The resultant hybrid catalyst, Pd@Hal-SA, was used as a heterogeneous catalyst for promoting copper and ligand-free coupling reactions under mild reaction condition. The catalyst exhibited high catalytic activity and recyclability (up to 10 reaction runs) with slight loss of the catalytic activity that stemmed from slight Pd leaching. The comparison of the catalytic activity of Pd-Hal, Pd-SA and Pd@Hal-SA confirmed the superior performance of the latter, indicating the contribution of two components, SA and Hal to the catalysis. Moreover, the catalytic activity of Pd@Hal-SA was higher than that of Pd@Hal + SA, implying that the use of hybrid system was more efficient that use of individual components in a separated form, due to the synergism between SA and Hal.
将埃洛石和淀粉的独特特性结合起来，通过胺功能化淀粉与 Cl-埃洛石纳米粘土的缀合，然后与 Pd（II）醋酸盐配位，合成了一种独特的杂化体。所得的杂化催化剂 Pd@Hal-SA 被用作在温和的反应条件下促进铜和无配体偶联反应的多相催化剂。该催化剂表现出高的催化活性和可回收性（高达 10 次反应循环），催化活性的轻微损失源于微量的 Pd 浸出。Pd-Hal、Pd-SA 和 Pd@Hal-SA 的催化活性比较证实了后者的优越性能，表明 SA 和 Hal 两个组分对催化的贡献。此外，Pd@Hal-SA 的催化活性高于 Pd@Hal+SA，这表明由于 SA 和 Hal 之间的协同作用，使用杂化体系比单独使用分离形式的单个组分更有效。
