Static Synthesis of MCM-22 and MCM-36 Zeolites Using Piperidine as an Organic Template

Piperidine was used as an organic template for its easy availability to replace commonly-used hexamethyleneimine(HMI) in static synthesis of MCM-22 zeolite. A novel synthesis approach for MCM-22 and MCM-36 zeolites was explored using hexadecyltrimethylammonium chloride(CTMACL) and tetrapropylammonium hydroxide(TPAOH) as swelling agents and tetraethoxysilane(TEOS) as the pillar-support agent. The morphology, specific surface area, pore size and surface acid amount of the synthesized molecular sieves were characterized by XRD, IR, SEM, N2 adsorption-desorption, NH3-TPD, and n-butylamine titration measurments. The results demonstrate that the proposed synthetic route is an effective way to fabricate well-defined MCM-22 and MCM-36 zeolites. The MCM-22 prepared have a high crystallinity degree of 98.5%, specific surface area of 382 m2?g-1, pore volume of 0.25 cm3?g-1 and a surface acid amount of 0.78 mmol?g-1, while MCM-36 possesses a specific surface area of 468 m2?g-1, pore volume of 0.39 cm3?g-1, surface acid amount of 0.94 mmol?g-1 and a mesoporous pore size of 2.7 nm.