Scale-up Study Of Higher Alcohols Synthesis From Syngas

With the decrease of oil resource, the synthesis of higher alcohols is paid attention. Higher alcohols can be used as fuel, additive in fuel and chemicals.As one of the important subjects in the field of C1 chemistry, the current interest in the higher alcohols synthesis (HAS) is focused on the potential application to produce valuable gasoline enhancers in view of both utilization of resources and environmental protection. The industrial application HAS is depended on the development of catalysts with high performance. Among the various catalysts,alkali-doped molybdenum sulfide catalysts are more attractive for commercial aspects due to its excellent resistance to sulfur poisoning and high activity for water-gas shift reaction. Higher alcohol synthesis (simplified as HAS) on MoS2-based catalysts has been extensively studied since the mid-1980s. A number of pioneer works have been published on this subject. Progress in this field has considerably contributed to the growing understanding of the nature of these catalytic reaction systems. Nevertheless,the existing technology of HAS is still on a small scale. The single-pass-conversion of the feed syngas and selectivity to C2+-alcohols both were relatively low. Under the used reaction conditions, most systems produce methanol as the main product instead of C2+-alcohols. Development of catalysts with high eficiency and selectivity to C2+-alcohols has been one of the key objectives for R&D efforts. However, the conventional ADM catalysts sufered from the lower activity and selectivity to C2+alcolols, which was restricted by the linear A-S-F distribution of C1-C6 alcohols and the additions of 3d transition metals could enhance the activity and C2+OH selectivity due to their strong abilities of hydrogenation and promotion of carbon chain growth. In the present thesis,promotion efects of F-T elements Fe, Co, Ni on the performance of ADM catalyst were investigated with a particular atention of Fe, a well-known component of methanation. preparation methods of catalysts showed great influence on performance of HAS and obtaining close-interaction of Fe-K-Mo by controlling the preparation processes was favor to high performance of HAS.The preparation methods , reaction mechanisms and Scale-up process were studies in detail to illustrate the nature of Ni promoter.