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Sulfonic acid-functionalized MIL-101 as a highly recyclable catalyst for esterification

机译：磺酸官能化的MIL-101作为高度可回收的催化剂，用于酯化

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摘要

The sulfoxy or sulfonic acid-functionalized MIL-101 catalyst was prepared by either post-functionalization or pre-modification of the organic linkers with the functionalized ligands, respectively, the latter is the so-called one-pot synthesis method. These catalysts were systemically characterized by XRD, N2 adsorption, acid-base titration, and FT-IR techniques and applied in the liquid-phase esterification of monocarboxylic acids with monohydric alcohols. The results show that the sulfonic acid-functionalized MIL-101 (S-MIL-101) prepared by the one-pot synthesis method possesses a higher catalytic activity in the esterification than its counterpart the sulfoxy acid-functionalized MIL-101 (S/MIL-101) prepared by the post-functionalized method, due to the fact that S-MIL101 has a higher acid loading and a high utilization efficiency of the functionalized acid sites. Moreover, S-MIL-101 is stable to leaching, behaves as a true heterogeneous catalyst, can be easily recovered by filtration, and can be reused five times in succession without any loss of its catalytic activity.
机译：通过分别用功能化的配体对有机接头的官能化或预修饰制备磺酸或磺酸官能化的MIL-101催化剂，后者是所谓的单锅合成方法。这些催化剂是通过XRD，N2吸附，酸碱滴定和FT-IR技术进行系统特征的，并在单羧酸的液相酯化中施用了单氢醇。结果表明，通过一锅合成方法制备的磺酸官能化的MIL-101（S-MIL-101）在酯化中具有更高的催化活性-101）由后官能化方法制备，因为S-MIL101具有较高的酸负荷和官能化酸位点的高利用效率。此外，S-MIL-101在浸出方面稳定，表现为真正的异质催化剂，可以通过过滤轻松回收，并且可以连续五次重复使用，而不会损失其催化活性。

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