A series of CoAl spinel oxide modified ordered mesoporous alumina with different CoAl₂O₄ contents were synthesized by a facile one-pot evaporation induced self-assembly (EISA) method. Then they were first investigated as supports for Cobalt-based catalysts for Fischer–Tropsch synthesis (FTS). The results from testing the catalysts clearly showed that the catalysts modified with CoAl₂O₄ exhibited higher catalytic activity than the common ordered mesoporous alumina catalysts. A volcano-type dependence of the catalytic activity with the contents of CoAl₂O₄ in the supports was observed. The results from in situ XRD revealed that the cobalt phase of the reduced catalysts modified with CoAl₂O₄ were more likely to be HCP rather than FCC. As inferred from in situ CO-FTIR and CO-TPD results, the CO dissociation ability was enhanced by increasing the content of the CoAl₂O₄ modification in the supports. Such a volcano-type dependence of catalytic activity with the contents of CoAl₂O₄ in the supports was due to the combination of two factors. One was the generation of the HCP cobalt, which exhibited a higher CO dissociation ability. The other was the synergistic effect of lower reducibility and the degree of dispersion. Meanwhile, when the Co/Al ratios was 0.08 and 0.12 in the supports, the catalysts showed higher C5⁺ selectivity than other catalysts, which was mainly due to their high Co site density on the catalysts surface.

通过简便的一锅蒸发诱导自组装（EISA）法合成了一系列Co Al ₂ O ₄含量不同的Co Al尖晶石氧化物改性的有序介孔氧化铝。然后首先对它们进行了研究，以作为费托合成（FTS）的钴基催化剂的载体。催化剂测试的结果清楚地表明，用CoAl ₂ O ₄改性的催化剂表现出比普通有序介孔氧化铝催化剂更高的催化活性。火山活性对CoAl ₂ O ₄含量的依赖性在支架上观察到。原位X射线衍射的结果表明，用CoAl ₂ O ₄改性的还原催化剂的钴相更有可能是HCP而不是FCC。从原位CO-FTIR和CO-TPD结果可以推断，通过增加载体中CoAl ₂ O ₄修饰物的含量可以提高CO的离解能力。CoAl ₂ O ₄含量对这种火山活动的催化活性的依赖性在支持中是由于两个因素的结合。一种是HCP钴的生成，它具有较高的CO解离能力。另一个是降低还原度和分散度的协同作用。同时，当载体中的Co / Al比为0.08和0.12时，催化剂显示出比其他催化剂更高的C5 ⁺选择性，这主要是由于它们在催化剂表面上的高Co位点密度。