A series of molybdate-intercalated and stabilized magnesium‐iron hydrotalcite (HMFeMo) materials with different molybdate loadings were successfully prepared by an in-situ hydrothermal method. The prepared HMFeMo materials were systematically characterized using Fourier-transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), Ultraviolet-visible spectroscopy, scanning electron microscopy, thermo-gravimetric analysis, nitrogen adsorption-desorption and X-ray photoelectron spectroscopy (XPS) experiments. The XRD results demonstrated the successful intercalation of molybdate ions in the interlayer space of magnesium-iron hydrotalcite and the stabilization of the layered structure. In addition, the XPS spectra of the HMFeMo materials revealed the presence of molybdenum in a higher-valent oxidation state. The calcination of HMFeMo materials led to the formation of solid solution of mixed metal oxides. Both the as-prepared and calcined HMFeMo catalysts showed promising activity for the epoxidation of cyclooctene, as a model reaction. Furthermore, the performance of the as-prepared and calcined HMFeMo catalysts for the oxidation of a biomass model compound, namely isoeugenol to vanillin, was evaluated. The isoeugenol conversion over the as-prepared HMFeMo catalysts under solvent-free conditions and using tertiary-butyl hydroperoxide in decane as the oxidant was good. Moreover, the isoeugenol conversion and selectivity toward vanillin of HMFeMo0.1, with a molybdate loading of 0.1 mol %, were the highest (86.2% and 83.1%, respectively) of all HMFeMo catalysts in this study at 80 °C for 5 hr. HMFeMo0.1 presented the best catalytic activity for both the epoxidation of cyclooctene and oxidation of isoeugenol to vanillin, and its activity remained unchanged after several runs.

通过原位法成功制备了一系列具有不同钼酸盐负载量的钼酸盐插层稳定镁铁水滑石（HMFeMo）材料。水热法。使用傅里叶变换红外光谱 (FT-IR)、粉末 X 射线衍射 (XRD)、紫外-可见光谱、扫描电子显微镜、热重分析、氮吸附-解吸和 X 射线对制备的 HMFeMo 材料进行了系统表征。光电子能谱 (XPS) 实验。XRD结果表明钼酸根离子成功嵌入镁铁水滑石的层间空间并稳定了层状结构。此外，HMFeMo 材料的 XPS 光谱显示钼存在于更高价的氧化态。HMFeMo 材料的煅烧导致混合金属氧化物的固溶体的形成。作为模型反应，制备的和煅烧的 HMFeMo 催化剂均显示出良好的环辛烯环氧化活性。此外，还评估了制备和煅烧的 HMFeMo 催化剂用于将生物质模型化合物（即异丁香酚）氧化为香草醛的性能。在无溶剂条件下和使用制备的 HMFeMo 催化剂上的异丁香酚转化率以癸烷为氧化剂的叔丁基过氧化氢效果良好。此外，钼酸盐负载量为 0.1 mol% 的 HMFeMo0.1 对香草醛的异丁香酚转化率和选择性是本研究中所有 HMFeMo 催化剂中最高的（分别为 86.2% 和 83.1%），在 80 °C 下 5 小时。HMFeMo0.1 对环辛烯的环氧化和异丁香酚氧化为香草醛均表现出最佳的催化活性，并且在多次运行后其活性保持不变。