Comparative study on the preparation of Co/HZSM-5 molecular sieves by ion exchange method and impregnation method

ABSTRACT One of the key technologies to improve the catalytic cracking of alkanes is the development of high-efficiency catalyst. This research prepared Co/HZSM-5 zeolites with the same metal oxide loading by ion exchange method and impregnation method respectively, and evaluated the reaction of catalysts with the fixed bed micro-reactor. The experimental results show that the n-heptane conversion ability of the catalyst prepared by ion exchange method is better than the catalyst prepared by impregnation method, the former has higher conversion level and gas product yield. However, the catalyst prepared by impregnation method has high selectivity for propylene and butane. The impregnation sequence has a great impact on the distribution of products, and the composite modification has a higher conversion capacity than the single metal modification.