Synthesis and characterization of a novel layered zeolite MCM-56

MCM-56, a novel layered zeolite, has been synthesized under a stirring cond ition by hydrothermal method and characterized by X-RD, TEM, TG and DTA. TE M shows that most of the crystal's exist in the form of single layer. Based on the experimental facts and framework type which MCM-56 belongs to, MCM- 56 should consist of very thin MWW-type layers which are just one unit cell along the c direction, and have a unique architecture with two-dimensional 10 MR pore system inside the layer and 12 MR cups(half of the MWW cages de scribed in the MCM-22 or MCM-49) on the crystal exterior without cages betw een layers.