钴系催化材料在费托合成中的反应已有较多研究文献，但对费托反应前后由于水热环境导致钴系催化材料发生结构变化的研究则很少.应用场发射扫描电子显微镜研究了3种新鲜制备的钴系复合催化材料的织构特征，应用粉末 X 射线衍射技术研究了费托反应前后3种钴系催化材料的结构变化；并且发现含有氧化铝成分的样品在经历费托反应的水热环境之后均在衍射角(2θ)为21．5和23．8°处出现新物相的衍射峰，即形成某种结晶性水合氧化铝；该新物相可能与被 H 2 O 氧化的钴物种发生反应生成无催化活性的CoAl2 O 4相而导致钴催化剂的衰减失活.
There are many literature about the reactions of cobalt-based catalytic materials in Fischer-Tropsch synthesis (FTS).However,the literature about the structural changes of cobalt-based materials before and af-ter the FTS reactions due to the hydrothermal environments is sparse.This article applied FESEM to study the texture features of three freshly-prepared cobalt-based composite materials and employed powder XRD to inves-tigate the structural changes of the three cobalt-based catalytic materials.It was found that the samples contai-ning alumina will form the diffraction peaks of new species at 2θ of 21.5 and 23.8°,which might be some kind of crystalline hydrated alumina.This type of new species might react with the cobalt species formed by H 2 O oxida-tion and produce non-catalytic CoAl2 O 4 phase which was one cause of deactivation or decay of cobalt catalysts.
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