Mn改性Ni/K/MoS2合成低碳醇催化剂反应性能研究

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.