High-Efficiency and Long-life Synergetic Dual-Oxide/Zeolite Catalyst for Direct Conversion of Syngas into Aromatics

Direct conversion of syngas to aromatics over metal oxide-zeolite (OX-ZEO) composite catalysts is a novel route for efficient utilization of carbon resources. To realize a high activity with considerable selectivity to aromatics and stability, the design of synergetic OX-ZEO catalyst to meet complex kinetics still remains a great challenge. In this work, a synergetic dual-oxide/zeolite catalyst was developed to tune the coupling between CO and H-2 activation through active H species migration, by adopting ZnZrOx oxide with stable single-layer Zn-O structure for H-2 activation and CeZrOx oxide with abundant oxygen vacancies as the CO activation component. The ratio and the proximity of CeZrOx and ZnZrOx is essential for the catalyst activity and stability. The optimal catalyst 1CeZrO(x)-2ZnZrO(x)/Z5@Si shows a superior catalytic performance with 75.6 % aromatics selectivity at a CO conversion as high as 57.5 %. After induction period, the catalyst exhibits excellent stability for 1100 h, keeping the high selectivity above 75 % with an average conversion of 43 %. This work will provide a new perspective to design a high performance and long-life OX-ZEO composite catalyst for direct conversion of syngas to high value chemicals.