CoFe₂O₄ nanoparticles (NPs) were synthesized by using a colloidal one-pot synthesis method based on the decomposition of metal acetylacetonates in the presence of oleyl amine. The characterization by X-ray diffraction, transmission electron microscopy and N₂ physisorption revealed non-porous spinel phase CoFe₂O₄ NPs with an average particle size of 4 nm. The unsupported metal oxide NPs were applied in the selective oxidation of 2-propanol in a continuously operated fixed-bed reactor under quasi steady-state conditions using a heating rate of 0.5 k min⁻¹. 2-Propanol was found to be oxidatively dehydrogenated over CoFe₂O₄ yielding acetone and H₂O with high selectivity. Only to a minor extent dehydration to propene and total oxidation to CO₂ was observed at higher temperatures. The detected low-temperature reaction pathway with maxima at 430 and 510 K was inhibited after the initial 2-propanol oxidation up to 573 K, but an oxidative treatment in O₂ or N₂O atmosphere led to full regeneration. No correlation between the desorbing amount or the surface oxygen species investigated by O₂ temperature-programmed desorption experiments and the low-temperature activity was observed. The amounts of evolving CO₂ during the TPO experiments indicate deactivation due to formation of carbonaceous species. Inhibition experiments with pre-adsorbed reaction intermediates and infrared spectroscopy identified acetate species as reversible poison, whereas carbonates are rather spectators. In addition, carbon deposition was detected by X-ray photoelectron spectroscopy, which also revealed a minor influence of cobalt reduction during the deactivation process as confirmed by X-ray absorption spectroscopy studies.

基于油酸胺存在下乙酰丙酮金属盐的分解，通过胶体一锅合成法合成了CoFe ₂ O ₄纳米粒子（NPs）。通过X射线衍射，透射电子显微镜和N ₂ 物理吸附的表征揭示了无孔尖晶石相CoFe ₂ O ₄ NP，其平均粒径为4nm。将未负载的金属氧化物NPs用于在准稳态条件下以0.5 k min ^-1的加热速率在连续运行的固定床反应器中选择性氧化2-丙醇。发现2-丙醇在CoFe ₂ O ₄上被氧化脱氢得到丙酮和H ₂ ö以高选择性。在较高温度下仅观察到少量脱水成丙烯和完全氧化成CO ₂。在最初的2-丙醇氧化至573 K之后，检测到的最大温度为430和510 K的低温反应途径被抑制，但是在O ₂或N ₂ O气氛中的氧化处理导致完全再生。通过O _2程序升温脱附实验研究的脱附量或表面氧种类与低温活性之间没有相关性。排放的CO ₂量在TPO中进行的实验表明由于碳质物质的形成而失活。使用预吸附的反应中间体和红外光谱进行的抑制实验将乙酸盐类物质识别为可逆毒物，而碳酸盐则是可观的观众。此外，通过X射线光电子能谱检测到了碳沉积，这也显示出X射线吸收光谱学研究证实了钝化过程中钴还原的较小影响。