Abstract Nickel salts of Keggin-type heteropolyacid on Zr(IV)-based metal-organic frameworks (UiO-66) has been synthesized via ion-exchange followed by a facile one-pot hydrothermal method. The synthesized catalysts underwent FT-IR, N2 adsorption-desorption, powder XRD, SEM and TEM analysis. The NiHSiW/UiO-66 catalyst was used as a new and effective solid acid in the catalytic transfer free fatty acid to biodiesel with an optimum conversion of 86.7%. The excellent activity of the NiHSiW/UiO-66 nanocatalyst was closely related to its high specific surface area, nano-sized catalyst, and the synergistic effects of NiHSiW salts and UiO-66 matrix. Importantly, a relatively stable catalytic performance was achieved for 8 repeated cycles. Finally, kinetics of the esterification reaction have been assumed to be of pseudo first order.

中文翻译：

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Keggin型杂多酸嵌入金属-有机骨架杂化纳米催化剂的镍盐的合成及催化性能

摘要 通过离子交换和简便的一锅水热法合成了 Keggin 型杂多酸在 Zr(IV) 基金属有机骨架 (UiO-66) 上的镍盐。对合成的催化剂进行了FT-IR、N2吸附-解吸、粉末XRD、SEM和TEM分析。NiHSiW/UiO-66催化剂作为一种新型有效的固体酸用于将游离脂肪酸催化转移到生物柴油中，最佳转化率为86.7%。NiHSiW/UiO-66纳米催化剂的优异活性与其高比表面积、纳米级催化剂以及NiHSiW盐和UiO-66基质的协同作用密切相关。重要的是，在 8 个重复循环中实现了相对稳定的催化性能。最后，酯化反应的动力学被假定为准一级。