ZSM-5/EU-1 co-crystalline zeolites were designed by two-stage synthesis technique with surfactants of diquaternary ammonium and hexamethonium bromide

that both surfactants displayed similar structure-directing effect. By adjusting pre-crystallization process

crystal coexistence of two zeolites was achieved and various ZSM-5/EU-1 co-crystalline zeolites were prepared with controllable phase proportions. Study on gel composition at each stage showed that gel composition at the first stage

especially the template concentration

had pronounced effect on phase proportions for the resulting ZSM-5/EU-1 co-crystalline zeolites. Compared to the mechanical mixture and pure-phase counterpart

ZSM-5/EU-1 co-crystalline zeolites had the largest BET surface area and the highest pore volume

especially for external surface area and mesopore volume. In catalytic cracking n-hexane reaction

ZSM-5/EU-1 co-crystalline zeolite with 39% EU-1 phase content exhibited the most excellent stability of reaction activity and the highest selectivity to light olefins

in particular propylene. At reaction time of 120 min

ZSM-5/EU-1 of 39% EU-1 had the selectivity of light olefins 10.7 percentage points higher than the mechanical mixture of 39% EU-1 and pure ZSM-5 zeolite

the propylene selectivity 8.5 and 9.1 percentage points as well as the P/E ratio 0.42 and 0.46 higher than the mechanical mixture of 39% EU-1 and pure ZSM-5 zeolite

respectively.