Cocrystalline Synthesis of ZSM‐5/ZSM‐11 and Catalytic Activity for Methanol to Propylene

Cocrystalline ZSM‐5/ZSM‐11 zeolite is hydrothermally synthesized at crystallization temperatures of 170 and 130 °C, respectively, in order to regulate the acidity as well as the framework Al distribution to enhance the propylene formation from methanol. ZSM‐5/11‐170 has analogous textural properties to ZSM‐5 but with increased strong Brønsted acid amount, raising the propylene selectivity by 49% in the methanol to propylene reaction at 480 °C, attributed to the increasing Al distribution in the straight channels by introduction of ZSM‐11 into ZSM‐5. With crystallization to 130 °C, the strong Brønsted acid amount of ZSM‐5/11‐130 is decreased by 82% compared with ZSM‐5/11‐170. The selectivity of propylene is increased to 38.25%, along with the decrease in the selectivity of ethylene and C 5 –C 9 .