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摘要: 以不同的添加方式在Ni/K/MoS2催化剂中加入Mn助剂，考察其合成醇反应性能。结果表明，Mn/Ni/K/MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0.6%的Mn助剂后，C2+含量，醇时空产率及选择性均明显提高;分步沉淀法使Mn的加入量增加到0.6%，醇时空产率明显增加。以浸渍法按化学计量加入Mn助剂考察其含量对催化剂合成醇性能的影响，当Mn/Mo（原子比）为1∶时，反应条件为315 ℃, 9.5 MPa, 6 000 h－1，醇时空产率和醇选择性分别达到最高值0.338?g/mL·h和69.6%。300 h的稳定性测试结果表明，共沉淀法改性的催化剂具有良好的稳定性。Abstract: Mn/Ni/K/MoS2 catalysts prepared by different methods and their performances for higher alcohols synthesis from syngas were tested under different reaction conditions. The C2+ alcohols content, the selectivity and space-time-yield of alcohols obviously increased when the catalyst with Mn content of only 0.26% was prepared by co-precipitation using (NH4)2MoS4, Mn(AC)2·4H2O and Ni(AC)2·4H2O as the precursors. As the content of Mn in Mn/Ni/K/MoS2 catalyst prepared by successive precipitation increased to 0.66%, the space-time-yield was improved remarkably. The effect of Mn content on catalytic performance was then investigated over Mn/Ni/K/MoS2 catalysts prepared by impregnation method. The results showed that the selectivity and space-time-yield of alcohols reached the maximum, i.e. 69.6% and 0.338 g/mL·h at the reaction conditions of 315 ℃, 9.5 MPa and 6 000 h－1 when the Mn/Mo (molar ratio) was 1.5. Furthermore, the stability test for 300 h over Mn/Ni/K/MoS2 catalyst prepared by co-precipitation showed that the catalyst had a good stability.
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Key words:
- CO＋H2 /
- higher alcohol /
- Ni/K/MoS2 /
- manganese
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