In the present work, we demonstrated synthesis of Al-SiO₂ and magnetically recoverable Al-SiO₂/Fe₃O₄ systems via grafting of triethylaluminum on SiO₂ and SiO₂-coated magnetic Fe₃O₄ nanoparticles, respectively. These materials were characterized by various techniques including elemental and N₂-adsorption/desorption analyses, transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR) using CO and pyridine as probe molecules. Amount of grafted Al on the support was found to affect the textural, acid–base properties and catalytic behavior in the isomerization of α-pinene oxide (PO) to campholenic aldehyde (CA). Maximal activity and selectivity towards CA was observed in the presence of sample with 12 wt% of alumina. It was demonstrated that 12%Al-SiO₂/Fe₃O₄ can be used as catalyst for at least four successive cycles without loss of activity.

在本工作中，我们证明了通过分别在SiO ₂和SiO ₂包覆的磁性Fe ₃ O ₄纳米颗粒上接枝三乙基铝来合成Al-SiO ₂和可磁回收的Al-SiO ₂ / Fe ₃ O ₄系统。这些材料通过各种技术进行了表征，包括元素和N ₂-吸附/解吸分析，透射电子显微镜（TEM）和傅立叶变换红外光谱（FTIR），以CO和吡啶为探针分子。发现在载体上接枝的Al的数量会影响α-pine烯氧化物（PO）异构化为樟脑醛（CA）的结构，酸碱性质和催化行为。在含有12 wt％氧化铝的样品存在下，观察到对CA的最大活性和选择性。已经证明，在不损失活性的情况下，至少连续四个循环可以使用12％Al-SiO ₂ / Fe ₃ O ₄作为催化剂。