The acceptor‐less dehydrogenation of 2‐octanol was tested over cobalt supported on Al₂O₃, C, ZnO, ZrO₂ and various TiO₂ substrates. The catalysts were characterized by ICP, XRD and TGA‐H₂. For Co/TiO₂ P25, the effects of passivation, aging (storage at room temperature), and in situ activation under H₂ were investigated. The catalysts must be tested shortly after synthesis in order to prevent deactivation. Cobalt supported on TiO₂ P25 was the most active and 69 % yield of 2‐octanone was obtained, using decane as a solvent. Selectivities for 2‐octanone were observed in the range of 90 % to 99.9 %. Small amounts of C16 compounds were also formed due to aldol condensation/dehydration reactions. The catalysts exhibited higher conversion in the dehydrogenation of secondary alcohols (65‐69 %), in comparison to primary alcohols (2–10 %). The dehydrogenation of 1,2‐octanediol led to 1‐hydroxy‐2‐octanone, with a selectivity of 90 % and 69 % for Co/TiO₂ P25 and Co/TiO₂ P90, respectively.

中文翻译：

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支持的无催化剂酒精脱氢钴催化剂。

在负载于Al ₂ O ₃，C，ZnO，ZrO ₂和各种TiO ₂衬底上的钴上测试了2-辛醇的无受体脱氢。通过ICP，XRD和TGA-H ₂对催化剂进行了表征。对于Co / TiO ₂ P25，研究了钝化，老化（室温存储）和H ₂下原位活化的影响。合成后必须立即测试催化剂，以防止失活。负载在TiO ₂上的钴以癸烷为溶剂，P25的活性最高，得到2-辛酮的产率为69％。观察到的2-辛酮的选择性范围为90％至99.9％。由于醛醇缩合/脱水反应，还形成少量的C16化合物。与伯醇（2-10％）相比，仲醇脱氢中的催化剂转化率更高（65-69％）。1,2-辛二醇的脱氢反应生成1-羟基-2-辛酮，对Co / TiO ₂ P25和Co / TiO ₂ P90的选择性分别为90％和69％。