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首页> 外文期刊>Fuel >Mixed alcohols synthesis from carbon monoxide hydrogenation over potassium promoted β-Mo_2C catalysts
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Mixed alcohols synthesis from carbon monoxide hydrogenation over potassium promoted β-Mo_2C catalysts

机译：钾促进的β-Mo_2C催化剂上一氧化碳加氢合成混合醇

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Potassium-promoted β-Mo_2C catalysts were prepared and their performances in CO hydrogenation were investigated. The main products over β-Mo_2C catalyst were C_1-C_4 hydrocarbons, only ～4 C-atom% alcohols were obtained. The products of hydrocarbons and alcohols obeyed traditional linear Anderson-Schultz-Flory (A-S-F) distribution. However, modification with K_2CO_3 resulted in a remarkable selectivity shift from hydrocarbons to alcohols. Moreover, it was found that potassium promoter enhanced the ability of chain propagation of β-Mo_2C catalysts and resulted in a higher selectivity to C_2+OH. For K/β-Mo_2C catalysts, the hydrocarbon products also obeyed traditional linear A-S-F plots, whereas alcohols gave a unique linear A-S-F distribution with remarkable deviation of methanol compared with that on β-Mo_2C catalyst. It could be concluded that potassium promoter might exert a prominent function on the whole chain propagation to produce alcohols. A surface phase on the K/β-Mo_2C catalysts such as the "K-Mo-C" explained the higher value for C_(2+)OH, especially could promote the step of C_1OH to C_2OH, or could have a role in producing directly C_2OH, but again this would be speculative. At the same time, the influence of the loadings of K_2CO_3 on the performances of β-Mo_2C catalyst was investigated and the results revealed that the maximum yield of alcohol was obtained at K/Mo molar ratio of 0.2.
机译：制备了钾促进的β-Mo_2C催化剂，研究了其在CO加氢中的性能。 β-Mo_2C催化剂上的主要产物为C_1-C_4碳氢化合物，仅得到〜4 C-原子％的醇。碳氢化合物和醇类的产物服从传统的线性安德森-舒尔茨-弗洛里（A-S-F）分布。然而，用K_2CO_3修饰导致从烃到醇的显着选择性变化。此外，发现钾促进剂增强了β-Mo_2C催化剂的链增长能力，并导致对C_2 + OH的更高选择性。对于K /β-Mo_2C催化剂，烃产物也服从传统的线性A-S-F图，而与β-Mo_2C催化剂相比，醇类化合物具有独特的线性A-S-F分布，甲醇有明显的偏差。可以得出结论，钾促进剂可能在整个链增长中发挥重要作用，从而产生醇。 K /β-Mo_2C催化剂上的表面相（例如“ K-Mo-C”）解释了C_（2+）OH的较高值，特别是可以促进C_1OH转化为C_2OH或在生成过程中起一定作用直接为C_2OH，但这又是推测性的。同时研究了K_2CO_3的负载量对β-Mo_2C催化剂性能的影响，结果表明，K / Mo摩尔比为0.2时，醇的最大收率。

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