화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.59, No.10, 4419-4427, 2020
Syngas Conversion to Aromatics over the Co2C-Based Catalyst and HZSM-5 via a Tandem System
Direct synthesis of aromatics from syngas was investigated by coupling Fischer-Tropsch to olefins (FTO) reaction and aromatization process. The CoMnAl composite oxides enabled the formation of olefins via Fischer-Tropsch synthesis over the Co2C phase with high selectivity, and the HZSM-5 zeolites with appropriate acidity were responsible for further aromatization of olefins. The mixing modes including granule mixing, dualbed, and tandem reactor were investigated in detail. It was found that the two-stage tandem reactor system exhibited better performance compared with other catalyst configurations, where the CoMnAl catalyst in the upstream reactor can maintain unique outstanding FTO catalytic performance and zeolites in the downstream can work at its own optimum reaction temperature. High aromatic selectivity (55.5 C %) and less amount of methane fraction (2.7 C %) were achieved at a CO conversion of 34.9 C %. The effects of vital parameters such as acidity density of HZSM-5, mass ratio of CoMnAl to HZSM-5, and space velocity on catalytic performance were also carefully studied. This work would provide an effective route for the direct production of aromatics via conversion of syngas derived from an alternative nonpetroleum feedstock.