MIL-125(Ti) metal–organic framework-derived nanoporous titanium dioxide–heteropoly acid (PW–TiO 2 ) have been synthesized by a facile hydrothermal approach and subsequent calcination, and the PW–TiO 2 catalysts were investigated using various characterization technologies including FTIR, XRD, SEM, TEM, N 2 -physisorption, and NH 3 -TPD. Further, we investigated the use of PW–TiO 2 composites as heterogeneous acid catalysts for the catalytic esterification of oleic acid. Among all series of catalysts, the calcined PW–TiO 2 at a temperature of 350°C showed excellent activity with a high conversion of 90.5% at 160°C for 4 h. More importantly, the catalyst could be simply separated via centrifugation and reused for six cycles and shows a relatively high conversion of 74.8%.

中文翻译：

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金属-有机骨架衍生的纳米多孔二氧化钛-杂多酸复合材料及其在酯化中的应用

MIL-125（Ti）金属-有机骨架衍生的纳米多孔二氧化钛-杂多酸（PW-TiO 2）已通过简便的水热方法和随后的煅烧方法合成，并使用多种表征技术对PW-TiO 2催化剂进行了研究。 FTIR，XRD，SEM，TEM，N 2-物理吸附和NH 3 -TPD。此外，我们研究了将PW-TiO 2复合材料用作油酸催化酯化反应的非均相酸催化剂。在所有系列的催化剂中，煅烧后的PW-TiO 2在350°C的温度下表现出出色的活性，在160°C的条件下4h的转化率高达90.5％。更重要的是，该催化剂可以简单地通过离心分离并重复使用六个循环，并显示出74.8％的相对较高的转化率。