Multiscale structural control of MFI zeolite using poly-quaternary ammonium cation

Polycation [–N + (CH 2 CH 2 CH 3 ) 2 –(CH 2 ) 6 –] n [OH − ] n , conceptually equivalent to bond-linked tetrapropyl ammonium cation, is designed to generate reduced a -axis and 36° rotational MFI nanosheet intergrowth with enhanced catalytic n -heptane cracking property.