Conversion of Methanol to Hydrocarbons over Phosphorus-modified ZSM-5/ZSM-11 Intergrowth Zeolites

The phosphorus-modified ZSM-5/ZSM-11 intergrowth zeolites has been used for the catalytic conversion of methanol to hydrocarbons. As evidenced by MAS NMR and NH₃-TPD, the modification by phosphorus leads a distinct decrease of the BrØnsted acid sites and the acid strength of the catalysts in comparison with the parent ZSM-5/ZSM-11, which causes a dramatic improvement of the selectivity towards propylene. At 400 °C, the ratio of propylene to ethylene can reach about 8.0. A comparison with the conventional ZSM-5 zeolite has been also carried out in the present study. Graphical Abstract Phosphorus-modified ZSM-5/ZSM-11 intergrowth zeolites show good catalytic performances in the conversion of methanol to hydrocarbons. The selectivity of propylene on p-modified ZSM-5/ZSM-11 is higher than on p-modified ZSM-5. This may be related to the proper acid strength of intergrowth zeolites. [graphic removed]