ZSM-12 zeolites, ZSM-12L and ZSM-12S, with MTW topology were synthesized by using methyltriethylammonium bromide (MTEABr) and tetraethylammnoium bromide (TEABr) as structure directing agents (SDA), respectively, for the isopropylation of biphenyl (BP) using propene as an alkylating agent. The particle sizes of the ZSM-12L and ZSM-12S were in the range of 5–10μm and less than 0.5 μm, respectively. The selectivities for 4, 4′- ...