Synthesis of ZSM-22 Zeolite Nanosheets with Improved Stability in the Catalytic Conversion of Methanol to Hydrocarbons

The synthesis of zeolite nanosheets is an effective strategytoobtain advanced catalysts with enhanced catalytic performance dueto the improved diffusion properties. ZSM-22 zeolite nanosheets (F-ZSM-22,U-ZSM-22) with a controllable orientation and a thickness of lessthan 20 nm were obtained through hydrothermal crystallization by introducingNaF or urea into the synthetic system of conventional ZSM-22 (C-ZSM-22).In the presence of both NaF and urea, a zeolite nanosheet (FU-ZSM-22)with a decreased width was synthesized. In comparison with C-ZSM-22,all ZSM-22 nanosheets displayed better diffusion properties. On testingcatalysts in the methanol-to-hydrocarbon reaction, ZSM-22 nanosheetsshowed better stability than C-ZSM-22, and FU-ZSM-22 was the bestcatalyst.